P0449 and P0457 in 2026: Vent Valve, Gas Cap, Recalls, and What Fails an Inspection

P0449 and P0457 are two different statements, and many pages treat them as one. One says a valve cannot move air. The other says the system found a leak and, on some cars, blames the cap.

P0449 — printed by Hyundai as "Canister Closed Valve (CCV) - Restricted Vent Circuit" in its air-drain-case bulletins, by Isuzu as "Evaporative Emission Vent Solenoid Valve Control Circuit Low Voltage" and by Kia as "VENT VALVE/SOLENOID CIRCUIT" — is the code for the vent side of the evaporative (EVAP) system. The EVAP system traps fuel vapor in a charcoal canister and burns it later; a vent valve opens the canister to fresh air and closes it for the leak test. P0457, printed by Land Rover as "Evap System Leak Detected (fuel cap loose/adrift)" and by Stellantis as "Loose Fuel Cap", is the leak code that, on some cars, points at the cap.

We searched NHTSA's index for manufacturer communications whose summary names P0449 or P0457, a vent valve, solenoid or vent line, a gas cap, filler neck or fuel fill inlet, or an EVAP leak (1,434 ids), read in full one of each cluster of near-identical bulletins plus every one whose summary names either code, and added the filings of twelve recall campaigns and three NHTSA investigation records: 319 distinct documents gone through in full (325 files, six of them byte-identical copies); of those, 19 print P0449 and 13 print P0457 in their own text. Bulletins whose summary only lists EVAP leak codes were not read; the method file states the limit. They agree on two things: a loose or dirty cap is a real, documented cause of P0457 on some trucks and cars, and most documents that print P0449 tie it to something that blocks or wets the vent path (dust, water, spiders, a drain part, connector terminals) or to a vent valve damaged by dust or water, while GM's engineering notices and Hyundai's air-drain-case bulletins print no cause; none blames the cap.

We also read 3,501 complaints from NHTSA's file, received from 2015 through early October 2026, that name P0449 or P0457, name a neighbouring EVAP code such as P0455 or P0456, describe the EVAP warning in owners' words (a "check fuel cap" message, a fuel inlet light, an EVAP leak, a vent valve), or name a purge valve with a light on. Each was sorted twice, independently, by the same written rules (method at the end). 2,503 describe an EVAP warning event on the owner's car; 998 do not. Only 32 print P0449 or P0457 themselves, 18 and 14, because most owners write what the dash said, not the code. The cap is the named cause in 106 of the 2,503. A part other than the cap is named in 1,136, and 757 mention a recall, special coverage or campaign (no recall names either code). Those are complaint counts, not failure rates.

By the end you will know which of five routes your P0449 or P0457 is on, what each costs, which recalls and programs exist in 2026 and what they do not cover, and what the documents say about inspection.

Claims marked 🟢 rest on a document listed in the Sources section, gone through in full unless marked otherwise. Claims marked ⚪ are shop-price estimates carried from our repair guides. Owner-reported figures are what people told NHTSA, published with ODI numbers, and every complaint count here comes from the 3,501 complaints sorted twice and published.

I built PulsCar after a $380 "full diagnostic" in Phuket in 2025 led to roughly $6,000 over six months across several shops (the story is on the About page).

What P0449 and P0457 say: a valve that cannot breathe, and a leak that may be the cap

Where the codes come from. 🟢 Kia's bulletin for the 2017-2018 Sportage prints the code as "DTC P0449 VENT VALVE/SOLENOID CIRCUIT" and says the restriction can be anywhere in the vent path: "If a foreign object is found anywhere from the filler neck to the main charcoal canister, such as a spider nest, the object will need to be removed with a pipe cleaner." 🟢 Land Rover's bulletin for 2017 Range Rover and Range Rover Sport prints the other code: "P0457-76, 'Evap System Leak Detected (fuel cap loose/adrift)', is found stored in the Powertrain Control Module (PCM)."

What you feel. For P0449, the pump nozzle clicks off early or, owners also write, fuel splashes back at the filler; 🟢 Kia's air-drain-case bulletin describes "an early shut-off during fuel refill and/or a malfunction indicator lamp (MIL) illumination with DTC(s) P0449 or P0451." For P0457, usually only the light, or on some makers a "check fuel cap" or "fuel fill inlet" message. 🟢 Hyundai says of its P0449 cases "There are no drivability symptoms associated with these DTC(s)."

What it is not. P0449 is not a purge flow code (that is P0441); it is not the vent system code P0446, which our P0446 guide covers; and P0457 is not the large-leak code P0455, the small-leak code P0442 or the very-small-leak code P0456.

First: P0449, P0457, or a neighbour? One code, several printed labels

Read the exact code before you buy anything, because the same string carries different labels in different makers' papers.

The labels do not agree. 🟢 Volkswagen's 2021 tech tip for the 2019-2021 Tiguan prints the table row "P0457 EVAP System Vent Control Circuit Open" while the text of the same document says "Cases have been found with the fuel cap tether trapped under fuel cap." 🟢 Kia's own diagnostic procedure PS469 lists "P0442, P0455, P0456, or P0457 (Evaporative Emissions System-Leak detected)" together. A reader that shows the label does not settle which side of the system is at fault; the maker's bulletin for your model does.

Search traps. Owners wrote the codes as PO449 and PO457 (a letter O), "PO 449" with a space, and "code 0449". 🟢 Ford's message for 2023 Escapes lists "check fuel cap" and "check fuel inlet" among "various warning messages displayed in FordPass" that Ford said engineering was working to fix over the air; a dash message is not a code.

The maker atlas: who prints a cap fix, a vent fix or a recall

The documents split by maker, and the split is the most useful thing in this file: a Ford truck with P0457 and a Chevrolet pickup with P0449 are on different roads. Document numbers link to the NHTSA PDF in Sources; only the claims are repeated here.

The Ford cluster is the biggest in the complaints. Ford is 942 of the 2,503 relevant complaints; the Focus alone is 396 and the Fusion and Milan 183. Owners there rarely print the cap; they print stalls after a fill-up, a crushed or swollen tank, and a recall number.

The 10-minute check

1. Write down how it started and read the code (2 minutes). After a fill-up, or on its own? A steady light, a flashing one, or a message? Read the code with a reader that shows maker codes. Do not clear it before the dealer sees it unless you are about to test a cap fix (that is our advice, not a maker's rule). 🟢 Volkswagen's tech tip only notes "If the MIL has illuminated, the light will remain for some time even if the customer has corrected the fuel cap concern."

2. Open the cap and look (3 minutes). Dirt or a crack in the rubber seal, a tether trapped under the seal, a cap that does not match the car. 🟢 Volkswagen: "Cases have been found with the fuel cap tether trapped under fuel cap." 🟢 GM's cutaway-van bulletin PI0873 names "the fuel cap tether being trapped between the fuel cap seal and the fuel fill pipe". Close it until it clicks; 🟢 Ford: "Advise the customer to turn the fuel filler cap clockwise until there is at least one audible click to seal properly." A capless fuel inlet has no cap to reseat; leave that to the dealer.

3. Watch what refueling does (3 minutes). Does the nozzle click off after a second or two, or does fuel splash back? 🟢 Infiniti's EVAP policy says "a hard-to-fill (refueling) condition symptom may indicate a clog in this evaporative emission vapor vent tube." That points at the vent path, not the cap.

4. Find your VIN, mileage and paperwork (2 minutes). Warranty-style programs below start from the date the car was first sold or put into service; safety recalls generally have no expiry date for the owner (ask the dealer about the campaign). Then call a dealer with the VIN. nhtsa.gov/recalls shows safety recalls only. Special coverage (a maker's free repair, usually with an age or mileage limit) and bulletins (dealer repair instructions, free only under a program) are answered by the dealer.

Six P0449 and P0457 situations, and which is yours

"The light came on after a fill-up and there is a 'check fuel cap' message." The cheapest cause is the cap. → Route 1.

"A Ford Super Duty or E-Series 2021-2023 with P0457." Ford prints the cap and a click. → Route 1.

"P0449, P2422 or P0448, the pump keeps clicking off early." The vent path is restricted or wet. → Route 3.

"The car stalls or will not restart after a fill-up; a Focus with a 2.0L engine, Fusion or Milan." Stop driving; ask for the purge valve recalls by VIN. → Route 4.

"The light is on and the tank looks swollen, crushed or leaks; a fuel smell inside the car." → Route 5; do not drive it.

"The cap is new, the dealer reset it and the light came back." A software, connector or part question. → Routes 2 and 4.

The P0449 and P0457 price ladder, from the bottom up

The second line is what the manufacturer papers print as a no-parts repair; GM's PI0873 prints 0.3 hours of labor to move a cap tether on cutaway vans, warranty directed to the upfitter, not a price. The ⚪ lines are shop-price estimates carried from our P0446, P0441 and P0455 guides; the other lines are what owners told NHTSA they were quoted or charged, listed with ODI numbers. Owner figures run above the estimates in most rows; many are dealer quotes rather than bills, and the narratives do not say which also include a diagnosis or a second part.

What does P0449 or P0457 cost to fix in 2026, and when is a part the wrong purchase? In PulsCar's review of 3,501 federal complaints, owners report 229 dollar figures, 104 of them quotes rather than bills: 7 for a gas cap job (median $130), 44 for a diagnosis (median $189.50), 16 for a vent valve or vent line (median $479.04) and 35 for a fuel tank or tank module (median $1,400). A tightened cap and a cleaned seal cost nothing, and the recall and special-coverage repairs are free where the VIN qualifies. A part is the wrong purchase when the cap has not been reseated and tested, when the maker prints a no-parts fix for your model, or when a recall or program already covers the part you were quoted.

The five P0449 and P0457 routes, cheapest first

Route 1 · The cap: loose, dirty, trapped or worn — $0, and a part is $10–$25

What it is. The EVAP system tests itself for leaks, and a cap that does not seal looks like a leak. The documents split on how common that is: it is printed as a possible cause for P0457 on Ford trucks and on a Volkswagen Tiguan (a trapped tether), and as a possible cause for other leak codes elsewhere.

What the documents say.

🟢 Ford, 2021-2023 F-Super Duty and E-Series (F-650/750 in 2021 only) with the 6.2L, 6.8L or 7.3L. SSM 49485: "This may be due to a loose fuel filler cap. The fuel filler cap design changed for 2021 to require one full turn to properly tighten." SSM 49778 says "three full turns" for the same trucks plus the 2022 E-Series, not the one turn of SSM 49485. The later SSM 50977 replaces both with a click: "turn the fuel filler cap clockwise until there is at least one audible click". SSM 51719, indexed by NHTSA in June 2023, adds dirt: "improper fuel filler cap installation and/or outside contamination on the fuel cap sealing surface". No part is replaced in any of the four.

🟢 A cap that is the defect. Hyundai's campaign 17-01-002 for some 2017 Santa Fe Sport: "the fuel filler cap seal may not provide proper sealing and trigger the Check Engine Light"; the cap is replaced, 0.3 hours. Acura 14-006, certain 2011-2013 TSX, 2012-2013 MDX, RDX, TL and ZDX and 2013 ILX (October 2014 revision): "The fuel fill cap gasket creates too much friction, preventing the cap from sealing properly"; the new cap has a brown gasket, and "If the gasket is brown, the fuel fill cap has already been replaced."

🟢 A cap that is fine in a filler that is not. Toyota's T-SB-0086-16 for 2014-2016 Corollas built at the TMMMS plant before VIN 5YFBURHE#GP431465: "In some vehicles the fuel filler neck may be out of position leading to this condition", and the repair moves the neck, not the cap. Stellantis 14-004-23 for plug-in Wranglers: "There is an air leak through the fuel filler cap to fuel filler neck seal because the fuel filler cap tether gets caught between them."

🟢 The caution Mazda adds. Mazda's 01-005/19: "The concern is most likely the result of the customer not getting the fuel cap completely closed after fueling the vehicle." In the same bulletin, for the 2011-2013 Mazda3 and 2007-2015 CX-9: "DO NOT replace any parts without detecting a leak using MGSS diagnostics." And: "NOTE: This repair is not warrantable." Mazda's older 01-002/18 adds "When diagnosing an evaporative emissions leak from the fuel filler cap, DO NOT TOUCH the fuel filler cap." Mazda does not say why (our reading: handling can hide a leak); at home, reseating is still step one.

What the owners report. The cap is the named cause in 106 of the 2,503 relevant complaints. 409 mention a cap that was tightened, replaced or checked; in 76 of them the cap ended as the cause, and in 290 the same warning came back or the repair did not hold. A Range Rover Sport owner wrote: "I will adjust the gas cap and it will go away and then come back on, illuminate again shortly after. There is a strong fuel smell inside and outside of the vehicle." A Malibu owner: "ENGINE LIGHT STAYS ON BECAUSE OF GAS CAP REPLACED 4 TIMES WORKS FOR AWHILE LONGEST WAS ABOUT A MONTH".

The cheap cause that gets skipped. The click. Ford, Mazda and Genesis all print a number or a sound. The second is the tether under the seal, named in Volkswagen's, GM's and Stellantis's papers.

Fix it yourself. The steps the documents support are the free ones: open the cap, look at the seal, wipe dirt from the sealing surface, free the tether, close it until it clicks. If you replace it, ask for the part number the maker's bulletin prints for your model. Expect the light to stay on for some time (Volkswagen's wording).

At the shop — say this: "Which cause does the maker print for my model and this code: cap, software, connector or filler? Please run the leak test before replacing any part and write the result on the repair order."

Route 2 · No part at all: software, a network file or a connector — $0 in parts

What it is. The computer, not the car, is wrong, or a terminal in a connector is. The documents print this for both codes, and they say so in plain words.

What the documents say.

🟢 Software. Mercedes, 2013 SL 65 (LI47.30-P-056273, version 4): "Check Engine light is activated. DTC P045500 and/or P045700 are stored in the ME control unit", caused by "an error in the ME control unit software", fixed with a flash. Acura 11-012, 2012 TL: "TIGHTEN FUEL CAP Message Is On Without DTC P0455 or P0456"; "The PCM misinterprets the purge flow volume." Acura 14-053, RDX: "During short drive cycles, the PCM may misinterpret inputs from the evaporative system".

🟢 A network file. Land Rover LTB01041NAS1, 2017 Range Rover and Range Rover Sport: "This may be caused by a network file incompatibility issue." The fix is a gateway module update, "No Parts Required", 0.2 hours.

🟢 A connector. Stellantis STAR case S2008000112: "MIL Lamp On Setting DTC’s P0441, P0456, P0457, P0440", repaired with "Inspect connector XY465A for any signs of spread or pushed out terminals, secure the connector and terminals as needed, no parts required." STAR case S2025000002 does the same for "P0441, P0443 or P0449" on 3.6L and 2.0L engines, and both carry "This document does not authorize warranty repairs."

🟢 Messages that are not EVAP faults. Ford SSM 51876, 2023 Escape: "check fuel cap" appears among warning messages for which Ford said engineering was working on an over-the-air fix, expected by the end of October 2023.

What the owners report. 49 relevant complaints end with software or a campaign procedure as the only repair stated (25 on a Ford, 19 on a Focus), and 60 where a shop found nothing or only cleared the code; 22 of the 60 say the warning came back. One Fusion owner wrote: "TWO CODES KEEP COMING UP. P0457 AND P1450. THESE ARE FOR THE EMISSIONS EVAPORATION SYSTEM. THE DEALER HAS COMPLETED RECALL REPAIR AND CLAIMS IT IS OK."

The cheap cause that gets skipped. The connector, and the drive cycle. A terminal check and a software search are minutes, and Acura's 14-053 explains why a short-trip car can set a message with no confirmed leak.

At the shop — say this: "Is there a software, gateway or connector document published for this code and my VIN, in the maker's service information or the STAR list? Please check it before any part."

Route 3 · The vent path: spiders, dust, water and the air drain case — $0 to $650

What it is. The vent lets air into the canister. If it is blocked or wet, the fuel pump nozzle clicks off, the tank can be pulled out of shape, and P0449 or P2422 sets. This is the P0449 route.

What the documents say.

🟢 Spiders. Kia PS162, Sorento from 2011: "spider webs in and around the evaporative emissions vent lines creating the set DTC". Kia PS532, 2017-2018 Sportage: "The most common area of spider nest presence is located at the filler neck."

🟢 Water and the air drain case. Kia FUE038, 2014-2018 Soul, 2012-2017 Rio and 2014-2017 Forte, built in set windows: "Check both of the Canister Close Valve (CCV) port ends for signs of water contamination." Its Rev 1 adds "Do NOT replace the CCV" for P0449 and P0451, and "Failure to follow proper procedure may result in a dealer chargeback." Hyundai 18-FL-003, 2012-2016 Veloster 1.6L: "There are no drivability symptoms associated with these DTC(s)"; the air drain case is replaced, 0.7 hours.

🟢 Dust. GM 15-06-04-002, 2011-2015 Silverado and Sierra: "Under certain operating conditions, dirt and dust intrusion into the CVS fresh air intake/venting system may result in restricted air flow." "Note: DO NOT replace the EVAP canister assembly for this concern unless it fails the leak test or it has ingested excessive amounts of dirt, dust or water." GM 23-NA-073, 2019-2025 Silverado and Sierra (the March 2025 reissue; cab and chassis excluded): a filter between canister and air inlet, "customer pay". Isuzu SB19-J-002, 6.0L N-Series: "Dirt and dust intrusion into the EVAP canister vent solenoid valve may cause this condition."

🟢 A policy for a clog. Infiniti's IEVAP policy extends the emission warranty to "15 years or 150,000 miles" for a clogged vapor vent tube and calls such a clog "very rare".

🟢 An O-ring, not the valve. Infiniti ITB17-042: "1. DO NOT REPLACE the vent control valve." Written for P0456 on the 2017-2018 QX30, 2014-2017 QX50 and 2016-2017 QX60: the part is a seal, 0.4 labor hours.

What the owners report. The vent valve, vent line or canister vent is the named cause in 146 complaints (Chevrolet 25, Ford 22, Volkswagen 16, Nissan 14, Honda 11). By script, 36 relevant complaints describe the nozzle clicking off or fuel spitting back, and 6 mention spiders. A Sierra owner: "EVAP VENT VALVE STUCK OPEN. WAS TOLD THAT IT WAS A KNOWN PROBLEM BUT NOT COVERED BY GMC - COST $501.17".

The cheap cause that gets skipped. A pipe cleaner. Kia prints it twice for spiders and says compressed air does not work; GM says not to open the cap during the job so debris stays out of the filler.

Fix it yourself. Not this one. The vent hose runs from the filler neck to the canister, under the car, and the bulletins reach it with wheels and brackets off. The only thing you can do at home is watch the nozzle and write down what refueling does.

At the shop — say this: "Is this a restricted vent path, with a spider, dust or water in the air drain case, or a failed valve? Please inspect from the filler neck to the canister before replacing the vent valve or canister, and tell me if the maker prints a do-not-replace line for my model."

Route 4 · The valves and the canister: vent valve, purge valve and recalls — $150 to $650, or free on a recall

What it is. The vent valve, the purge valve and the canister are the parts that move vapor. A stuck valve can let the tank pull in on itself; a flooded canister can stall the car after a fill-up. This is where recalls live.

What the documents say.

🟢 A vent solenoid with a coverage program. GM 14264, 2012 Cadillac CTS and Chevrolet Camaro: "Dealers are to replace the evaporative emission canister vent solenoid valve. The repairs will be made at no charge to the customer." The terms are "a period of 10 years or 120,000 miles (193,000 km), whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership"; about 137,603 U.S. vehicles. By our computation the 10 years ran out in 2022 for a car first in service in 2012.

🟢 A purge valve behind P0457. Ford 19-2207, 2013-2017 C-MAX, Fusion and MKZ hybrids with "P1450, P0456, P0457, P04EE And/Or P04EF": "This may be due to the sealing capability of the canister purge valve." The fix is a PCM reprogram and part AU5Z-9C915-D, 0.8 to 1.1 hours.

🟢 The recalls. The Fusion and Milan purge valve recall 15V-793 (Ford 15S34, 411,205 vehicles built July 2008 to March 2011) and the Focus recalls 18V-735 (1,282,596) and 19V-515 (57,488). The Focus letter: "The canister purge valve is a one-time replacement if required at time of recall repair." The 15V-793 completion table, last updated October 2017, shows 258,009 of 411,205 remedied, 62.7% by our arithmetic.

🟢 The vent float valve inside a tank. 12V-063, 2012 Honda Pilot and Acura MDX, 8,709 vehicles: "A detached VSF case may result in fuel overflowing from the fuel tank, or possibly a fuel leak, which can increase the risk of fire."

What the owners report. Other EVAP hardware (purge valve, canister, EVAP lines, pressure sensor, pump-module seal) is the named cause in 755 complaints, 395 of them on a Ford, and 277 mention a recall, campaign or bulletin. 253 say the problem came back. By script, the Ford recall numbers 18V-735 appear in 92 relevant complaints, 19V-515 in 35 and 15V-793 in 31, and about 200 relevant complaints say the car is not in a recall or use similar words. A Milan owner: "CANISTER PURGE VALVE HAD TO BE REPLACED PAID $300. GOING THROUGH MY RECORDS I FOUND THAT ON APRIL 5,2016, I HAD A RECALL 15S34 FUEL TANK AND CANISTER PURGE VALVE INSPECTION COMPLETED. THERE WAS NO EVIDENCE OF CRACKS OR LEAKS SO ONLY RECALIBRATION WAS COMPLETED."

The cheap cause that gets skipped. The recall status. An inspection that closed the recall without replacing the valve is a recall repair on paper, and Ford's Focus letters say the replacement is a one-time event at the visit.

At the shop — say this: "Are recalls 15V-793, 18V-735 or 19V-515 open or closed on my VIN? If closed with an inspection only, what test was run on the purge valve and what was the result? Please write it on the repair order."

Route 5 · The filler neck and the tank: where the vent or the seal is built in — $200 to $1,500, or a recall

What it is. Some vents and seals are not separate parts. They sit inside the filler neck or the fuel tank, and the bill is for the assembly.

What the documents say.

🟢 Filler and cap leaks that a light may not report. Toyota's special service campaign 24TC08 (Toyota's papers also call it an emission recall), 2023-2024 Corolla Hybrid, 2023 Prius and 2023-2024 Prius Prime, about 70,700 vehicles: "In the subject vehicles, the vapor leak detection monitor system may not detect a vapor leak from the fuel filler cap and illuminate the malfunction indicator lamp (MIL)." The fix is a fuel tank clamp or a recalibration, free. 26TF01, published August 2026 for 2018-2024 Camry Hybrid and 2019-2022 Avalon Hybrid, about 258,200 vehicles (Toyota's FAQ total is about 284,000 and says certain 2019-2025 Lexus ES 300h are also covered): "Under certain conditions, debris can accumulate inside the fuel cap causing potential fuel vapor leaks that can cause increased evaporative emissions to exceed the regulated limits."

🟢 A filler neck extension. Acura's dealer message of September 25, 2026 for certain 2015-2020 TLX: "Acura is extending the warranty coverage for the fuel fill pipe assembly related to this condition to 10 years from the original date of purchase or 150,000 miles, whichever occurs first." It adds a six-month grace period.

🟢 A tank built around a vent. Suzuki's Kizashi dust recall (18V-769: "Your Suzuki Service Provider will replace the fuel tank and fuel cap, and if necessary, the canister set.") and Ford's SSM 54948 for some non-hybrid 2025-2026 Explorers built February to December 2025 ("an intermittently sticking fuel level vent valve on the fuel tank allowing fuel to enter the evaporative emissions system lines and evaporative emissions canister during refueling") each end at the tank.

🟢 What NHTSA found. In PE13-016, closed in February 2014, Chrysler told NHTSA that the float in the multifunction control valve of 19-gallon tanks on 2005-2006 Chrysler 300, Dodge Charger and Magnum with 5.7L or 6.1L engines could swell and let fuel into the purge line, causing a stall after refueling; Chrysler extended the warranty on those tanks to lifetime coverage.

What the owners report. The filler neck, a pipe or the tank is the named cause in 235 complaints (Ford 90, Jeep 21, Dodge 15, Chevrolet 14). By script, 101 relevant complaints describe a tank deformed, crushed, swollen or collapsed, 76 on a Ford. A GMC Envoy owner: "THEY SAID THERE'S A GAS LEAK COMING FROM THE GAS TANK FUEL INLET VALVE. COMMON PROBLEM FOR THE GMC ENVOY AND CORRECTION INVOLVES REPLACING THE WHOLE FUEL TANK COSTING AN AVERAGE $1,400."

The cheap cause that gets skipped. The part that crushed the tank. In some Ford complaints the owner or dealer names a stuck purge valve first and a deformed tank second (we did not count the sequence); replacing the tank without checking the valve risks a repeat, in our reading, and Ford's 18S32 letter says "Fuel pump modules are only covered in this program if fuel tank replacement is necessary."

Fix it yourself. No. A tank holds fuel and vapor; Suzuki's recall procedure pumps the fuel out first, and Ford's tank inspection lowers the tank on the car.

At the shop — say this: "Was the tank deformation measured? Does a recall, special coverage or extension cover my tank, filler pipe or cap, and was the purge valve replaced before the tank was quoted?"

The coverage file: is there a recall, and which programs still run in September 2026

No recall file names P0449 or P0457. We went through the filings of twelve campaigns on the EVAP vent path, filler or tank: 61 recall documents, from Part 573 reports to owner letters. None prints either code. The Focus recalls print "P0420, P1450, P0443, P0452, P0456, P0460 and/or P2196"; the Fusion and Milan recall prints no code; the Mazda, Suzuki, Honda, Audi and Transit recalls describe parts and symptoms.

The status column is our computation as of September 2026, the month of the latest documents in our set, from the terms each document prints; none prints your car's in-service date, so a dealer confirms it by VIN.

Ford, and what "closed" means. 🟢 The 15V-793 completion table, last updated October 2017, counts "Total Remedied" as "The total number of products either remedied, inspected without needing remedy, or returned to inventory." A car counted as done may have had its valve inspected and left. Ford's 18S32 letter says the canister purge valve is "a one-time replacement if required at time of recall repair". The refund windows for owners who paid before the notice were printed as ending January 31, 2016 (15S34, Fusion and Milan), December 31, 2019 (18S32, Focus) and August 19, 2019 (19S22, Focus). After the 2019 dates the Focus letters print one route, a refund request through the dealer for an emergency repair at a non-Ford shop; the free recall repair itself is still found by VIN.

Mazda, Suzuki, Honda. 🟢 Mazda's owner letter for the 2009-2010 Mazda6: "Also, your vehicle may fail a state or local emission inspection if this recall is not completed." Honda's Pilot letter says the same. 🟢 Suzuki's 2019 letter for the Kizashi's second recall: "there will be no charge to you for any recall campaign service-related parts or labor", and "If you do not have this recall campaign performed, you will not be able to renew your California" registration.

Toyota's two emission recalls. 🟢 24TC08 is the one that matters for a cap: its own wording says the leak monitor "may not detect a vapor leak from the fuel filler cap", so a Corolla Hybrid or Prius can carry the defect without a light. California "will not allow your vehicle to be registered" without it.

What is not covered. 🟢 Mazda's 01-005/19: "NOTE: This repair is not warrantable." GM's dust filter: "This repair is not a warranty repair, but a customer pay alteration." Kia's and Hyundai's bulletins for the air drain case carry warranty operation codes and no coverage period, and Hyundai's campaign papers send any other out-of-warranty part found during a campaign to a goodwill request: "submit a Prior Approval Request for goodwill consideration."

What 3,501 complaints about EVAP warnings show

How we went through them. We went through every complaint in NHTSA's file received from 2015 through early October 2026 that names P0449 or P0457 in any spelling we found, names a sibling EVAP code, describes the warning in owners' words (a "check fuel cap" message, a fuel inlet light, an EVAP leak, a vent valve, spiders), or names a purge valve with a light on: 2,564 from our first search. Before the second batch, an independent search looked for what the first had missed and added 937. Every complaint was sorted twice, independently, by the same written rules, fixed before the sorting; the two sortings matched on the category for 3,202 of 3,501 (91%). 2,503 were about an EVAP warning event on the owner's car; 998 were not, false matches (a pharmacy named CVS, crankcase or cabin vent valves, cap mentions in lists of unrelated parts) and fuel smells, leaks and spills with no light, code or message.

Is it the cap? Of the 2,503, 106 end at the cap (4.2%). 409 describe a cap that was tightened, replaced or checked, and in 76 of those the cap ended as the cause. 290 of the 409 say the same warning came back or the repair did not hold. Complaints come from owners whose trouble did not end, so the share is not a forecast for your car; the leak test is.

Which code. The 32 complaints that print P0449 or P0457 themselves are a small group: seven end at the vent valve, five at other EVAP hardware, and 13 with nothing found or done. Across all 2,503, the code most often printed is P0456, in 149 complaints, then P0455 in 52, P0442 in 34, P0496 in 33 and P0441 in 32.

Recalls and programs. 757 mention a recall, special coverage or campaign (30%). By script, about 200 say their car is not in a recall or use words close to it, and 150 report a refusal or "not covered" wording. 781 say the warning came back or the repair did not hold.

Inspection and safety. 86 describe a failed or blocked inspection or emissions test. In NHTSA's own fields, 6 of the 2,503 are marked as a fire, 20 as a crash, 21 report an injury, 55 a tow and 1 a death (a crash the complaint attributes to a suspected stall after a purge-valve diagnosis, a Ford Focus complaint).

When and how old. From 172 to 260 relevant complaints a year since 2015, and 179 in 2026 through 4 October. The median model year is 2014. Among the 1,382 that give a mileage between 1,000 and 400,000, the median is 80,000 miles.

Is the gas cap usually the cause of a P0449 or P0457 warning, and how often does it come back? PulsCar went through every complaint from 2015 to 4 October 2026 that describes an EVAP warning, each sorted twice, independently, by the same written rules: 3,501 complaints, of which 2,503 describe an EVAP warning event on the owner's car, only 32 of them printing P0449 or P0457. The cap ends as the named cause in 106 of those, 4.2%. Owners tried the cap in 409; it was the cause in 76, and 290 report the warning came back or the repair did not hold. A purge valve, canister or other EVAP hardware is named in 755, a filler neck or tank in 235 and a vent valve or vent line in 146. The shares describe owners who wrote to NHTSA, not every car with a light. The deciding fact for a car is the leak test.

What owners say they paid

Of the 2,503 relevant complaints, 189 state a dollar figure tied to the repair, 229 figures in all: 104 quotes, 62 bills, 57 amounts paid and 6 where the narrative does not say. The figures are what owners wrote, not audited invoices, and we publish them with ODI numbers.

The $6 is a filler pipe cover and the $14 a canister cover that one owner said would have avoided a $1,500 to $1,600 repair; the $5,093 is a dealer's first quote on a 2018 Volt for a problem the owner called the same as a recall, cut to $2,384 after the owner complained. The lowest cap figure is a $70 cap a Santa Fe owner bought after their mechanic's scan named the fuel cap; the highest, $578, is what one Sequoia owner said an average visit cost, at least, with a gas cap replaced each time the light came on, 10 to 12 times.

Why P0449 or P0457 comes back after a repair

The leak was not the cap, or not only the cap. Of 409 owners who tried the cap, 290 report the warning came back. 🟢 Kia's own procedure for leak codes lists "rollover valve, charcoal canister, CCV, air filter, evaporator lines" as places a restriction hides, and says the fuel tank must be "at least half full before the test or it will not complete properly."

A recall visit that tested and replaced nothing. 🟢 NHTSA's quarterly completion tables, which Ford files too, count inspected-without-remedy cars as remedied. In our complaints, 277 of the 755 with an EVAP part named mention a recall or campaign, and some describe a recall visit that only inspected the valve and closed the recall, and a valve that failed later (for example ODI 11032077 and 11010355).

The light that outlives the fix. 🟢 Volkswagen: the light "will remain for some time even if the customer has corrected the fuel cap concern." 🟢 Stellantis: "A road test will not confirm the repair, as P0456 or P04EE are only set with multiple engine off and drive cycles, which cannot be reproduced during a dealer visit."

Can you drive with P0449 or P0457?

A steady light on a car that runs normally, with no fuel smell, is not a reason to stop at once; have the leak test done soon: on some cars a blocked vent path can strain the tank until it cracks (Suzuki's and Mazda's recalls, which print no code). Stop driving and have it towed for liquid fuel, a strong fuel smell inside the car, fuel running out of the filler, a car that stalls or will not restart after a fill-up, or a tank that looks swollen; a fuel gauge that moves wrongly on its own means a shop that day. 🟢 NHTSA's PE13-016 describes stalls after refueling "when the vehicle is stopped or travelling at low speeds" and judged the risk low for the cause it found; 🟢 Suzuki's Part 573 says negative tank pressure can lead to a cracked tank and "increasing the risk of a fire", and Honda's says a detached float case can mean a "fuel leak, which can increase the risk of fire."

Should you buy a used car with a P0449 or P0457 history?

Ask for the repair orders, not the story. 🟢 The questions that the documents make worth asking: Was the cap replaced, and with a manufacturer part? Is a recall open or closed on this VIN, and if closed, did it replace the purge valve or only inspect it? Has the tank ever been replaced, and was it deformed? Then drive several normal trips, with the engine off between them, before an inspection: 🟢 Acura lists as a possible cause that its software may misread the evaporative inputs "During short drive cycles", and Stellantis says P0456 and P04EE "are only set with multiple engine off and drive cycles".

Clearing P0449 or P0457 before an inspection

Will P0449 or P0457 make you fail an emissions inspection, and what should you do before the test? PulsCar read 319 distinct manufacturer documents and investigation records and 3,501 complaints: no document says either code by itself fails a test, but Mazda's and Honda's recall letters say an unrepaired recall may fail one, and California ties completion of emission recalls to registration renewal. 86 relevant complaints describe a failed or blocked inspection, most with the light on or a code stored, a few with the EVAP monitor not ready. Before the test, reseat the cap until it clicks, check recalls by VIN, and drive several normal trips rather than clearing the code and heading to the station. Ask the station what it reads. Do not pay for a part before a leak test, since several makers say not to, and ask for the result in writing.

What the owners say happened. A Ram 1500 owner: "TOOK MY TRUCK TO GET INSPECTION AND IT DIDN'T PASS BECAUSE OF CODE P0456 : EVAPORATIVE EMISSION SYSTEM LEAK DETECTED WHY?" A Fusion owner whose purge valve recall visit had only inspected the valve: "WHEN I ATTEMPTED TO SELL THE VEHICLE IT WOULD NOT PASS INSPECTION." Our description of the check is not a promise about your state's rules.

Clearing it yourself. Hyundai's procedure treats the stored code as evidence. 🟢 It prints the DTC screen first and erases the codes only after: "Print the DTC screen from the GDS and retain with the repair order for documentation purposes and then erase all DTC(s)." A code cleared at home leaves the dealer and the inspection station nothing to read.

What the manufacturers' papers tell a dealer to do with P0449 or P0457, checkpoint by checkpoint

1. Check for a published fix before parts. 🟢 Stellantis's STAR case S2025000002 records, for P0441, P0443 or P0449 on 3.6L and 2.0L engines and when no service bulletin applies, a connector check "before beginning normal diagnostic procedures", and S2008000112 records a connector inspection too; Land Rover's and Mercedes's fixes are software.
2. Test for the leak, not the cap. 🟢 Infiniti's ITB09-012f: "Use the following resources to perform diagnostics and confirm the cause of stored DTCs" and a leak test with a scan tool or a smoke machine; Mazda's MGSS test and its ultrasonic detector; Kia's manual test with the tank at least half full.
3. For P0449, inspect the vent path. 🟢 Kia and Hyundai: the CCV port ends and the air drain case; Honda (for the sibling vent-valve code P2422): the canister vent tube for dirt; GM: the vent solenoid and the filter.
4. Replace one thing. 🟢 GM's warning not to replace the canister unless it fails the leak test or has taken in excessive dirt, dust or water, Infiniti's not to replace the vent control valve, Kia's not to replace the CCV.
5. Confirm after the repair. 🟢 Hyundai's procedure runs an EVAP leakage test with the fuel level between 20 and 70 percent; Stellantis warns that a road test cannot confirm a P0456 repair.

Three P0449 and P0457 traps the documents warn about

Trap 1 · Replacing the part the code names. P0449 names a vent valve, and four makers print a do-not-replace line (Kia and GM for P0449, Mazda and Infiniti for P0456) for the valve, the CCV, the canister or any part until a leak or the real cause is confirmed. A vent valve is roughly a $150 to $350 part installed by our repair-guide estimate, and owners who reported vent-valve repairs named a median of $479.04; replacing it when the restriction is upstream is the purchase those makers warn against.

Trap 2 · Treating a closed recall as a repaired car. A recall that closed on an inspection, a PCM calibration or a one-time valve replacement counts as completed in the recall tables even if the valve fails next year; and the dates up to which owners' own paid repairs were refundable were January 2016 (Fusion and Milan), August and December 2019 (Focus) and, for the 2023 Transit recall, April 2023, with a dealer route for emergency repairs after them. Ask what was done, not whether it is closed.

Trap 3 · Clearing the light and driving to the test. The papers describe a light that stays after the fix (Volkswagen), a repair a road test cannot confirm (Stellantis) and a message Acura says its software may set on short drives, and one owner's inspection readiness result read "EVAP-NOT READY" (secondary air also not ready). Fix first, drive several normal trips, then test.

Three P0449 and P0457 claims, decoded

"The gas cap is a known issue on my model." True for specific cars and false as a rule. Ford prints it for 2021-2023 Super Duty and E-Series, Hyundai for the 2017 Santa Fe Sport, Genesis for certain 2022 G70 and G90, Acura for 2011-2013 models, Stellantis for certain 2021 models and plug-in Wranglers, Mazda (for P0456), Infiniti for 2007-2011 models and GM for 2012-2013 cutaway vans; GM's Silverado and Sierra, Nissan's Sentra and Titan and Kia's bulletins print the vent side instead.

"There is a recall." By code, none; by car, many. 757 complaints mention a recall, campaign or coverage program, and about 200 say their car is not in one. The recall is found at nhtsa.gov/recalls by VIN, the program by the dealer.

"P0449 means the vent valve is bad." The documents blame spiders, dust, water, an air drain case or a connector before the valve; Kia and GM print a do-not-replace line for P0449 itself; Mazda and Infiniti print one for the sibling P0456.

The P0449 and P0457 plan: 10 minutes, today, this week

Today (10 minutes). Reseat the cap until it clicks, look at the seal and the tether, note whether the pump clicks off, read the code and write down the mileage. Today (VIN). Check nhtsa.gov/recalls and ask a dealer about special coverage and your model's EVAP bulletins. This week. If the light is back, pay for one diagnosis, ask for the leak test result in writing, and ask the shop to check the printed fix for your model before any part. Budget. A manufacturer cap is a $10 to $25 part by our repair-guide estimate; a diagnosis is mostly $100 to $250 in our owner file (median $189.50; a few reports reach $500 to $600); a valve, canister, filler neck or tank is a bigger decision that a recall or program may already cover.

These are composite scenarios, not individual customers: a Ford Focus owner with a light after every fill-up who is quoted a purge valve and finds the recall open; a Silverado owner in a dusty county whose pump keeps clicking off and whose dealer prints a customer-pay filter; a Super Duty owner with a P0457 who tightens the cap until it clicks and watches the light go out after some driving. They use only facts and price ranges already in this article.

Sources and documents

Primary documents only. Where a claim in this guide is marked 🟢, it rests on one of the items below, and the reference is given so you can pull the document yourself. Claims marked ⚪ are shop-price estimates carried from PulsCar's repair guides — estimates, not measurements from a dataset we own.

1. Ford: Special Service Messages SSM 49485, SSM 49778, SSM 50977, SSM 51719, SSM 54948, SSM 51876; hybrid TSB 19-2207; recalls 15V-793, 18V-735, 19V-515, 23V-071 with their Part 573 reports, owner letters, dealer letters (Supplements) and quarterly completion table.
2. General Motors: 09-06-04-028D, 15-06-04-002, 23-NA-073 Version 1, Version 2, Version 3, Version 4, Version 5, PIE0417, PIE0417A, PIE0528, PI0873, special coverage 14264, its customer letter, 14264B.
3. Hyundai, Kia, Genesis: Kia PS162, PS532, PS532 Rev 1, FUE038, FUE038 Rev 1, Hyundai 18-FL-003, 18-FL-002, 17-01-002, 16-01-068, Genesis T21G, Kia SC268, Kia PS469, PS567, Hyundai campaign 962 (21-01-009H).
4. Stellantis (FCA): STAR cases S2025000002, S2008000112; TSBs 14-005-22 Rev B, 14-004-22 Rev A, 14-004-23, 14-007-23, GPOP 9003768.
5. Toyota, Honda, Acura, Mazda, Infiniti, Nissan, Isuzu: Toyota T-SB-0086-16, T-SB-0054-18, 24TC08, 26TF01 dealer letter, 26TF01 technical instructions; Acura and Honda 14-006, 11-012, 14-053, 15-010, 20-002, 20-056, TLX fuel fill pipe message; Mazda 01-005/19, 01-002/18; Infiniti and Nissan ITB09-012f, ITB17-042, IEVAP, NTB19-037, NTB14-044, ITB22-042; Isuzu SB19-J-002.
6. Mercedes-Benz, Land Rover, Volkswagen: Mercedes LI47.30-P-056273 version 4, version 3; Jaguar Land Rover LTB01041NAS1, SFCC sheet of March 2019; Volkswagen tech tip 01-21-01TT, tech tip 26-16-02.
7. Recalls on the vent path, filler and tank (Part 573 reports, owner letters, dealer papers): Mazda 11V-134, 14V-114, 20V-347; Suzuki 14V-464, 18V-769; Honda and Acura 12V-063; Audi 22V-673; Volkswagen 08V-156; Ford as above.
8. NHTSA investigations: PE13-016 (closed February 2014), DP14-002 and DP17-002, read from NHTSA's investigation file.
9. PulsCar analysis of NHTSA public data, October 2026: 3,501 complaints about EVAP warnings each sorted twice by the same written rules; owner-reported amounts; the document list with check status and links. Complaints, amounts, documents, the sorting rules and how we did it.

For the neighboring pages: the P0446 guide for the vent control circuit, P0455, P0456 and P0442 for the leak codes, P0441 and P0440 for purge flow and the system fault, how to reset a check engine light, what a car inspection costs, the check engine light guide and why a car smells like gas.

PulsCar does not diagnose EVAP faults from a recording or read a leak test. For P0449 and P0457, the leak test, the VIN lookup and the documents above are the evidence.

Methodology. The complaint set is every complaint in NHTSA's file received from 2015 to 4 October 2026 that names P0449 or P0457 in any spelling we searched, names a sibling EVAP code, describes the EVAP warning in owners' words, or names a purge valve with a light on, in two batches (2,564 and 937, the second found by an independent audit) — 3,501 in all. Every complaint was sorted twice, independently, by the same written rules, fixed before the sorting, with an addendum fixed before the second batch (the two sortings matched on the category for 3,202 of 3,501, 91%). Every disagreement (537) was settled under written rules R1-R13 published with the sorting rules; final checks changed seven entries on which the two sortings had agreed. The documents are 316 distinct manufacturer files (322 with six byte-identical copies) and three NHTSA investigation records, gone through in full; bulletins that name only sibling EVAP codes were not gone through in full (see the method file).

Prices verified July to October 2026 in the repair guides they are carried from and in the owner reports above, and reviewed quarterly. Technical documents verified October 2026: the 319 distinct documents we went through, listed in our published file — among them Toyota 26TF01 (August 2026), the Acura TLX fuel fill pipe message (September 2026) and Ford SSM 54948.

Had P0449 or P0457 cleared by a cap, a connector, software or a valve, or a recall refused? Email [email protected] with the vehicle, mileage and outcome.