SORTING RULES - ELECTRONIC THROTTLE MOTOR / ACTUATOR COMPLAINTS (P2101 THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT RANGE / PERFORMANCE, WITH P2100 TO P2109, P2111, P2112, P2118, P2119, P2176 AND THE INTAKE RUNNER CODE P2008 SORTED WITH IT)
PulsCar analysis of NHTSA public data, October 2026. License: CC BY 4.0

Fingerprint of the rules text below, taken when it was written and before any complaint was sorted: 8e77f3e61c0842d299ac123653bf761ecde14566fde8b8041d24cda46b115ff7 (2026-10-30T16:15:41Z)
Fingerprint of the addendum for the second batch, taken before that batch was sorted: 17174e7c7dba90932aa482aefc0e3277678798c32ed316d066bba26b6e835e32 (2026-10-30T16:36:06Z)
(The fingerprints are of the rules files as first written. The text published below differs from them only where a few working terms were replaced by plain words such as "sorting rules" and "sorting".)

# Sorting rules - electronic throttle motor / actuator complaints (P2101 study; P2008, P2100-P2109, P2111, P2112, P2118, P2119 sorted with it)

Written before any complaint in the set was sorted.

## Pool (how the complaints were found)
NHTSA complaints received 2015-01-01 to 2026-10-04 (the latest received date in the flat files). A complaint is in the pool if its
narrative matches any of the following case-insensitive text searches:

1. R1 - the code P2100 to P2109 or P2008 or P2009 by any spelling (letter O for zero, a space, hyphen or period after the P, suffix 00), or a bare number after a code word:
   `(?<![A-Z0-9])P\s?[-.]?\s?2\s?(?:1\s?[0O]\s?[0-9]|[0O]\s?[0O]\s?[89])(?:\s?[-:]?\s?[0O]{2})?(?![0-9])`
   `\b(?:code|codes|dtc|dtcs|error|cel|coded|fault)\W{0,6}#?\s?P?\s?(?:210[0-9]|200[89])\b`
2. R1x - the throttle-actuator sister codes P2111, P2112, P2118, P2119, P2176 (stuck open, stuck closed, current range, closed-position performance, minimum position not learned).
3. R2r - intake manifold runner control by name: "intake manifold runner", "manifold runner", "intake runner", "runner control", IMRC, IMT valve/actuator/motor.
4. R2 - a throttle part by name (throttle actuator, throttle motor, electronic throttle control / body, ETC, throttle body, throttle plate, throttle valve, service throttle, drive-by-wire) TOGETHER WITH reduced-power wording
   ("reduced power", "reduced engine power", "limp mode", "limp home", "derate", "engine power").
5. R3 - a throttle part by name (as above) together with another symptom wording and no reduced-power wording: stalls, lost / loss of / no power, will not accelerate,
   hesitation, surge, "wrench" light.
   The exact expressions are in the section "The text searches as written" below.

Every narrative matching R1, R1x, R2r or R2 is sorted (1,462 complaints). Narratives that match ONLY R3 (3,042) are too many to sort
all; a random sample of 1,000 of them (fixed random seed 2101, drawn before any sorting) is sorted. The other 2,042 were not sorted.
Narratives that mention the throttle without any of the wording above are not in the pool.

Background for the reader (not a sorting rule): in a drive-by-wire engine the accelerator pedal sends a signal to the engine computer, and the computer
drives a small motor in the throttle body that opens and closes the throttle plate. The computer checks the plate's position sensors against what it commanded.
P2101 is "throttle actuator control motor circuit range / performance" (the plate does not go where the computer commands). Related codes: P2100 motor circuit open,
P2102 low, P2103 high, P2104-P2106 forced idle / forced shutdown / forced limited power, P2107 processor, P2108 performance, P2111 / P2112 stuck open / closed.
P2008 is the intake manifold runner control circuit (a different part: a flap or valve inside the intake manifold). Owners say "reduced engine power", "limp mode",
"wrench light", "service throttle soon", "throttle body", "electronic throttle".

For each complaint record exactly one CATEGORY and four yes/no FLAGS. You see an excerpt around the matching words (and the whole
narrative when nothing matched). Code what the excerpt supports; if it is cut off at a point that matters, code what is stated.

## RELEVANCE
N - Not a throttle-control event on THIS vehicle. Use N when:
    - the match is false (the words appear in another meaning);
    - the throttle part is mentioned only in passing (a list of parts, a general statement, advice, a news story, another vehicle), with no statement that THIS vehicle had
      a throttle-related fault code, a reduced-power / limp / stall / no-response event tied to the throttle or engine controls, or a throttle repair;
    - the only event is sudden or unintended acceleration, cruise control, brake or steering failure, a crash, or a recall about something else, and the narrative
      describes no throttle fault code, no loss of power, and no throttle repair.
    NOT N (relevant) when, on this vehicle: a code P2100 to P2109, P2008, P2009, P2111, P2112, P2118, P2119 or P2176 is named; OR reduced power / limp mode / a throttle or "wrench" warning /
    a stall or no response to the pedal is described together with the throttle or engine controls; OR the throttle body or its motor is described as failed, cleaned, replaced, blamed, tested or recalled;
    OR a throttle stuck open or an engine that raced is blamed on the throttle by a shop or the dealer.

## CATEGORY (one letter) - what was found or done, on this vehicle

T - Throttle body or motor. The throttle body, the throttle actuator / motor, the throttle plate or its gears was named by a shop, dealer or mechanic as the cause, or was replaced
    (also "electronic throttle control module" when it is the throttle body unit).
C - Cleaning only. The throttle body was cleaned (carbon, dirt, sticking), with or without a relearn, and that was the repair or the named cause; nothing was replaced.
W - Wiring or connector. The throttle connector, a wire, a harness, a ground, or a fuse or relay for the throttle circuit was named as the cause or was repaired / replaced.
D - Pedal or position sensor. The accelerator pedal assembly or pedal sensor, or a throttle position sensor as a separate part, was named as the cause or was replaced
    (the sensors, not the motor).
M - Engine computer. The engine control module (ECM / PCM) was named as the cause or was replaced, repaired or reprogrammed with a new unit.
F - Software or campaign only. A reflash / software update, relearn, recall, TSB, special-coverage or warranty-extension procedure was the only repair stated
    (no part named as cause).
V - Battery or charging. A weak or dead battery, a bad alternator, low system voltage or a bad battery cable was named as the cause or was the repair.
A - Air intake and runners. A vacuum or intake leak, the intake manifold, the intake runner / runner control (IMRC) valve or motor, the MAF sensor or air filter was named as the cause or was the repair.
O - Another cause. A repair outside the categories above was named as the cause (fuel, ignition, misfire, EGR, transmission, catalytic converter, turbo, and so on), or the symptom was traced to something else.
K - Checked and cleared. The shop or dealer inspected or tested and found no fault, or only cleared the code, with no repair; or the symptom went away by itself and nothing was done.
U - No diagnosis or repair stated. The event is reported but nothing was found or done yet, or the complaint does not say; also an owner's own guess, a code reader or scan with no shop/dealer/mechanic
    mentioned; also the case where a part was replaced and the owner says it did not fix it, with no other cause named.

Precedence when more than one fits: use the FINAL repair the complaint reports as having fixed it (or, if it never got fixed, the cause the shop named last).
A part replaced that the owner says did not help does not count. If several parts were replaced together and no single one is named, use the most specific named part in the order W, T, D, A, V, M.
Cleaning (C) is used only when cleaning was the stated fix; if the throttle body was cleaned first and then replaced, use T.
Among F, O, K, U: F before O before K before U.
A cause the owner merely guesses at does not count (an owner's "probably the throttle body" is U unless a shop or the dealer said it, or the part was replaced by someone).

## FLAGS (yes/no)

stall - the complaint states that the engine stalled or shut off (while driving, at a stop or at idle) because of this event.
limp - the complaint states reduced engine power, limp mode, a power-reduced message, a throttle or "wrench" warning light, or an engine that did not respond to the pedal or would not go above a low speed or rpm.
recall - the complaint states that a recall, special coverage, service campaign, extension, TSB or "known issue" notice for this vehicle was performed, offered,
    missing, refused, asked about, or is blamed or credited for this event.
returned - the complaint states that after a repair or a reset the same light, code or symptom came back, or the repair did not fix it.

## OUTPUT

One CSV line per complaint, in the order given, no header line:
`odino,category,stall,limp,recall,returned,note`
category is one letter (N T C W D M F V A O K U); flags are yes or no (for N, all four flags are no);
note is at most 15 words, no commas, saying what decided the category.


## Addendum for the second batch (written before the second batch was sorted)
After the first batch was sorted, an independent search of the whole complaint file looked for complaints the first text searches missed. It found 789 more that, on a first reading, describe a throttle-control event on the owner's car without the exact wording of the first searches ("throttle control", "ETC light", "throttle warning", a wrench lamp, "engine power reduced" messages, a shop naming or replacing the throttle body with no stall or power-loss word, odd spellings of the codes, runner or swirl flaps). That search stopped at its cap of 800 rows; by its own samples, at least 400 more narratives that name a throttle body and more than 1,000 that carry an "engine power reduced" message remain unsorted. The 789 were sorted under exactly the same rules, categories and questions as the first batch. Nothing in the rules changed. The search also set aside 55 narratives about pedal and throttle position-sensor correlation codes (P2122, P2127, P2128, P2135, P2138) that never name the throttle motor or body: they belong to the pedal-sensor guide and are not in this study.


## Rules used to settle disagreements and in the consistency check
R1 to R10 were written after the first batch was sorted and before its disagreements were settled. The rules with an h and a number (R11h1, R12h23 and so on) were added as the disagreements of later groups were settled; the number after the h names the group or groups of complaints the rule was first written for (h1 the first group; h23 the second and third; h45; h67; h89; h1011; h1213; h1415 the last two groups of the second batch; the first batch was sorted in groups 1 to 11 and the second batch in groups 12 to 15). Each disagreement was settled by one rule, named in the rule_applied column. The consistency check was run twice after all groups were sorted and settled: first on 135 complaints, then on 136 more (271 re-read; 52 changed, 46 of them already agreed by both sortings, 6 after a disagreement settled by rule). The rules of the consistency check are Rcons1 to Rcons3 (first check, 135 re-read, 28 changed) and Rcons1b to Rcons4b (second check, 136 re-read, 24 changed); the letter b only keeps the two checks apart in the rule_applied column.

- R1 the owner diagnoses and repairs the car alone, or names a part only as the owner's own guess, with no shop, dealer or mechanic diagnosis and no part replaced -> U (sorting rules: an owner's guess does not count).
- R2 a code read at a parts store or with the owner's own reader, with no shop or dealer diagnosis -> U.
- R3 a part replaced (by anyone) and the owner says it did not cure the problem, with no other cause named -> U; if a later cause or fix is named, use that (the sorting rules' precedence).
- R4 a shop, dealer or mechanic who "thought", "said" or "diagnosed" the throttle body / its motor (even without a repair done yet) -> T; a quote or recommendation to replace it counts as named by the shop -> T.
- R5 a TSB / campaign / reflash / reprogramming / relearn is the only repair stated -> F, also when a cleaning was done as a step of the same bulletin procedure with nothing replaced; a cleaning done alone and cured it -> C.
- R6 limp flag = yes only when the narrative states reduced power / limp mode / a power-reduced or service-throttle or wrench message or lamp / no pedal response / very low power. A stall or shutoff alone is not limp.
- R7 stall flag = yes only when the engine stalled, died or shut off (loss of drive with the engine running is limp, not stall).
- R8 recall flag = yes only when a recall / campaign / TSB / special coverage / extension / "known issue" notice is tied to THIS event, including asked about, refused or "no recall" answers; an unrelated recall in the same narrative -> no.
- R9 returned = yes only when the same light, code or symptom is stated to have come back or not been cured after a repair or a reset; an intermittent symptom that simply continues with no repair done -> no.
- R10 when the excerpt does not settle it: the narrower reading (flags no; category U).
- R11h1 a sensor named by a shop/dealer or replaced (throttle position sensor, throttle body position sensor, pedal sensor) -> D, not T; T only when the throttle body / motor unit itself is named or replaced.
- R12h1 a replaced part counts as the fix only if the narrative says it worked for months; if the problem came back within days/weeks, or no relief is stated, apply R3 (U), unless R13h1 applies.
- R13h1 after a replacement that did not cure, a later shop/dealer inspection that found nothing or could not duplicate it -> K (K before U in the sorting-rules order).
- R14h1 "might be / could be" speculation by a dealer or advisor is not a named cause (unlike "thought/said/diagnosed" in R4); with no code and no repair -> K, with a failed repair -> U.
- R15h1 turning the key off and on to clear a message is not a "reset" for returned; an intermittent symptom that simply recurs with no repair -> returned no (R9).
- R16h1 when a repair did not cure, the cause the shop named last decides (O before K), even if a final visit found nothing.
- R11h23 N vs U/O: N when the excerpt shows no throttle code, throttle repair, reduced-power/limp/throttle message or pedal non-response on this vehicle and the trouble belongs to another system (hybrid switching, gauges/electrical, ignition switch, steering, transmission, fuel pump job with only a throttle gasket, a bare "intake manifold runner" in a list); for N all flags are no.
- R12h23 a bare "lost power" / "lost all power" / "no power" without limp, reduced-power, warning lamp/message or pedal-unresponsive wording is not limp (R6, R10); an explicit "did not go into limp mode" is no.
- R13h23 recall: a recall/bulletin/extension cited only for other models or vehicles, an owner's opinion that one "should" exist, or a dealer saying "known problem" -> no; an owner who searched for or asked about a recall for this vehicle and found none -> yes (R8).
- R14h23 a cleaning, adjustment, reprogram or campaign that is not reported to have fixed it (problem came back) is not "the final repair that fixed it" (the sorting rules' precedence); with no cause named -> U, as R3/R12h1 do for parts.
- R15h23 dealer inspected and could not find / reproduce it, no repair -> K; a dealer who says it cannot test until the light is on has not inspected -> U.
- R16h23 "I was told" / "apparently" / internet or others' reports with no shop or dealer identified as the source is not a named cause -> U (R1).
- R17h23 a shop hedging between two candidate parts ("either the X or the Y") has not named a cause -> U (R14h1).
- R11h45 a computer "reset" (no reflash, software update, relearn procedure or campaign named) is clearing, not repair: with no part named -> K, not F (R15h1, sorting-rule K).
- R12h45 the manufacturer saying the car is merely "included in" a service program / campaign, with no diagnosis of this car and no repair done yet -> U (R10); a program that was performed is F (R5).
- R11h67 a stall or poor-running complaint where a dealer or shop names a non-throttle cause (fuel, motor mount, etc.) is relevant -> O, flags kept; N only when no shop-named cause and no throttle/engine-control link is visible (then R11h23: all flags no).
- R12h67 stall = yes only when the excerpt itself states stalled / died / shut off in full words; a word cut off at the end of the excerpt, or "restart" alone, is not enough (R7, R10).
- R13h67 recall = no for a rhetorical or wishful line ("please recall", "should be a recall", "why not recalled", "have not seen a recall") with no stated request, search or answer about a recall for this vehicle (extends R13h23).
- R14h67 a cleaned or replaced part that is only reported with "same problem back" and no months of relief stated -> U (R12h1, R14h23); an earlier fix stated to have lasted months -> that part's category (R12h1).
- R15h67 a first-time diagnostic visit that found nothing and cleared the code, followed by a further event before any repair, is an intermittent symptom continuing -> returned no (R9, R15h1).
- R11h89 "ETC"/"etc." meaning etcetera is not a throttle mention (extends R11h23). With no throttle part/code/repair and no limp / reduced-engine-power message / pedal non-response / stall tied to engine controls (ECM, check-engine lamp) -> N, flags no. If such a limp or reduced-power event is stated, the complaint is relevant: shop-named cause -> its category, a different system named by a shop -> O, nothing found/done -> U (K if a dealer inspected and found nothing, R15h23).
- R12h89 an NHTSA investigation / action number (PE, DP, EA, probe) is not a recall, campaign, TSB or special coverage -> recall no (R8, R13h23).
- R13h89 the owner unplugging a sensor/connector to erase a code, or clearing codes, is a reset (unlike a key cycle, R15h1): symptom back afterwards -> returned yes (R9).
- R14h89 "restarted" / "cranked again" alone does not state a stall: stall yes only when the narrative says stalled, died or shut off (R7, R10); "lost power" alone is not limp (R12h23).
- R15h89 a TSB / technical service document cited by the owner for this event counts as a TSB tied to the event -> recall yes (R8); a recall for another model/year only -> no (R13h23).
- R11h1011 a false "etc." (abbreviation read as ETC) is the only throttle wording: the complaint is relevant only if it states a limp / reduced-power message or lamp, a throttle/ETC/EPC/wrench message, or no pedal response on this vehicle (then category by the cause a shop/dealer named, else U); a stall-only, shutdown-only, warning-lights-only or engine-mechanical/transmission/EV-battery failure with none of those -> N.
- R12h1011 category N -> all flags no, so a flag in dispute on an N complaint is set to no.
- R11h1213 repeated repair for the same trouble ("worked on 3 times", "replaced twice, third needed", "only improved, still slow") -> returned yes (R9); a fresh recurrence with no repair in between stays no (R15h1).
- R12h1213 wording that is missing because the excerpt starts or ends mid-sentence is not evidence: stall/limp stay no (R10); "restart" alone is not a stall.
- R11h1415 recall: an explicit statement that no recall/campaign has been issued or that the maker refuses one for this problem is a "missing" recall -> yes (R8); a mere opinion that one should exist, with no status stated, -> no (R13h23).
- R12h1415 a part of the pedal assembly named by the dealer (accelerator pedal terminal, pedal sensor terminal) -> D, unless a separate connector/harness/wire is named (then W).
- R13h1415 a "throttle control / power train module" repaired by the dealer is the engine computer -> M (R16h1 last-named cause); T only for the throttle body or motor unit itself.
- Rcons1 part replaced / cleaned / reflashed or campaign done, narrative says problem not cured or came back (days, weeks, or no relief stated), and no later or other cause named, no new shop naming of the same part -> U (R3, R12h1, R14h23, R14h67).
- Rcons1b a reflash / software update / reprogram / relearn / recall or TSB remedy (F, or a programming step on the throttle body) after which the same trouble came back within days or weeks, or is said not to have fixed it, with no later cause named in the excerpt -> U (R3, R14h23).
- Rcons2 failed repair followed by a later dealer/manufacturer finding nothing (no fault code, could not duplicate, "normal") -> K (R13h1).
- Rcons2b a cleaning (C) after which the trouble came back or was not cured, with no later cause or replacement named and the part not named as failed -> U (R14h23, R14h67).
- Rcons3 shop only named the part (nothing replaced), first visit cleared/found nothing, symptom simply continues -> keep category, returned='no' (R9, R15h1, R15h67).
- Rcons3b a repair made by the owner alone (connectors cleaned / soldered) that gave only temporary relief and no shop named a cause -> U (R1, R3).
- Rcons4b a part or connector replaced or repaired (or a chain of parts, each stated as not curing it) after which the trouble came back within about two weeks to five weeks, no months of relief stated, no other cause named -> U (R3, R12h1, R14h67).

## The text searches as written (case-insensitive)
First search (the pool above):
- R1, code by any spelling: `(?<![A-Z0-9])P\s?[-.]?\s?2\s?(?:1\s?[0O]\s?[0-9]|[0O]\s?[0O]\s?[89])(?:\s?[-:]?\s?[0O]{2})?(?![0-9])`
- R1, bare number after a code word: `\b(?:code|codes|dtc|dtcs|error|cel|coded|fault)\W{0,6}#?\s?P?\s?(?:210[0-9]|200[89])\b`
- R1x, sister codes: `(?<![A-Z0-9])P\s?[-.]?\s?(?:2111|2112|2118|2119|2176)(?![0-9A-F])`
- R2r, intake manifold runner control: `(?:intake\s+manifold|manifold|intake)\s+runner|runner\s+control|\bIMRC\b|\bIMT\b\s+(?:valve|actuator|motor)`
- A throttle part by name (used by R2 and R3): `throttle[\s-]*(?:actuator|motor)|electronic\s+throttle\s+(?:control|body)|\bETC\b|throttle[\s-]*body|throttle\s+plate|throttle\s+valve|service\s+throttle|drive[\s-]*by[\s-]*wire`
- Reduced-power wording (R2): `reduced\s+(?:engine\s+)?power|limp[\s-]*(?:mode|home)|derate|engine\s+power`
- Other symptom wording (R3): `\bstall(?:s|ed|ing)?\b|lost?\s+power|loss\s+of\s+power|no\s+power|(?:will|would|did|does|won|can)\W{0,3}n[o\']?t\s+accelerat|not\s+accelerat|no\s+accelerat|hesitat|\bsurg(?:e|es|ed|ing)\b|wrench|wouldn.t\s+accelerate`
One flaw in the first search is stated here plainly: the abbreviation "etc." (and so on) matched the search for the electronic throttle control abbreviation ETC, so some narratives entered the pool by accident; the sorting rules set them aside as not relevant (rule R11h1011) unless they also described a limp or reduced-power message, a throttle or wrench message, or no response to the pedal.

Independent search of the whole complaint file (run after the first batch was sorted; it looks for what the first search could not match). Its first step was a scan of every narrative not already in the first batch or in the unsorted list, for any of these wordings:
- throttle_other: `throttle[\s-]*(?:sensor|position|assembly|housing|unit|light|warning|system|issue|problem|fault|error|code|malfunction|failure|response|control|cable|relearn|learn|module|pedal|lag|delay|stick|stuck|bore|gasket|connector|wiring|harness|relay|fuse|check|fail|motor|actuator)`
- e_throttle: `\be[\s-]?throttle|\belectronic\s+throttle|\belectric\s+throttle|\bETC\s+(?:light|lamp|warning|system|indicator|fault|code)|\bETC\b`
- typo_throttle: `\b(?:throtle|throttel|thottle|throtlle|throtttle|trottle|throttl|throttal|throtel|throttele|trotle)\w*`
- power_reduced: `power\s+(?:is\s+|was\s+|has\s+been\s+|been\s+)?reduc|reduc\w*\s+(?:in\s+)?(?:engine\s+)?power|\bpower\s+reduction|reduced\s+performance|reduced\s+accel|engine\s+(?:is\s+)?(?:in\s+)?(?:a\s+)?safe\s+mode|\bsafe\s+mode|\blimp\b|\blimped\b|limping|\bwrench\b|\bspanner\b`
- service_msg: `service\s+(?:the\s+)?throttle|service\s+engine\s+power|check\s+engine\s+power|engine\s+power\s+(?:reduced|warning|light|limited)|power\s+limited`
- noresp: `(?:accelerator|gas|pedal)\W{0,25}(?:would|did|does|do|will|is|was)?\s*(?:not|n.t|no)\s+(?:respon|work|do\s+anything|accelerat)|pedal\s+(?:does|did)\s+nothing|(?:no|not|lack\s+of)\s+(?:throttle\s+)?(?:pedal\s+)?respons|stuck\s+(?:at\s+)?idl|(?:rev|rpm)s?\s+(?:would|did|does)\s*n.?o?t\s+(?:rise|increase|go\s+up)|(?:stuck|limited|stays|capped)\s+(?:at|to|under|below)\s+\d+\s*mph|would\s+not\s+go\s+(?:above|over|faster)|wouldn.t\s+go\s+(?:above|over|faster)|(?:won.t|would\s+not|will\s+not|can.t|cannot)\s+(?:go\s+)?(?:above|over|past|exceed)\s+\d+`
- oddcode: `\bP\s?[0O]\s?2\s?1\s?[0O]\s?[0-9]|\bP2\s?1\s?O\s?[0-9]|\bP2\s?[0O]\s?[0O]\s?8|\b2101\s*(?:code|dtc|error|fault)|\bcode\s*#?\s*:?\s*2101|\b2008\s+code|\bcode\s*#?\s*:?\s*2008\b|\bP\s?2\s?1\s?0\s?[0-9]\b|\bB\s?2\s?1\s?0\s?[0-9]\b|\bP\s?2\s?1\s?[1-2][0-9]\b|\bP\s?2\s?1\s?7\s?6`
- runner: `swirl\s+(?:flap|valve|control|actuator)|tumble\s+(?:flap|valve|control)|\bIMRC\b|\bIMT\b|intake\s+(?:flap|valve|actuator)|manifold\s+(?:flap|actuator|valve)|variable\s+intake`
- idle: `idle\s+(?:relearn|learn)|throttle\s+(?:relearn|learn|adapt)|relearn\w*\s+(?:the\s+)?(?:throttle|idle)`
The narratives returned were grouped by whether a throttle word stood next to a symptom word, and the groups were read against the relevance rule above; the ones that met it were listed, up to a cap of 800 rows. Motorcycles, buses and heavy trucks were left out. Narratives about pedal or throttle position-sensor correlation codes (P2122, P2127, P2128, P2135, P2138) that never name the throttle motor or body were set aside for a separate guide (55 narratives).

## Pool history
- First search: 4,504 complaints in the whole file matched at least one of the searches above (received 1 January 2015 to 4 October 2026, light vehicles and others alike): the code by any spelling 65; the sister codes P2111, P2112, P2118, P2119, P2176 293; intake runner wording 67; a throttle part together with reduced-power wording 1,117; a throttle part together with other symptom wording (stall, lost power, will not accelerate, hesitation, surge, wrench light) 3,179. A narrative can match more than one, so these numbers overlap.
- First batch, 2,462 complaints. The 1,462 complaints that matched the code, sister-code, runner or part-plus-reduced-power searches were all sorted. A further 3,042 matched only the part-plus-other-symptom wording; that is too many to sort, so a random sample of 1,000 was drawn with a fixed seed (2101) before any complaint was sorted, and those 1,000 were sorted. The other 2,042 were not sorted; their ODI numbers are in complaints-not-sorted.txt. 1,462 + 1,000 = 2,462. They were sorted in 11 groups of about 224.
- Second batch, 789 complaints. After the first batch was sorted, a separate search of the whole complaint file looked for what the first search could not match, and about 1,300 narratives were read against the same relevance rule. 789 complaints were added (second batch, 4 groups of about 197), all sorted by the sorting rules plus the addendum above. They describe a throttle-control event in words the first search did not accept: "throttle control" or "ETC" lights, a throttle warning or wrench lamp, "engine power reduced" messages, a shop naming or replacing the throttle body with no stall or power-loss word, odd spellings of the codes (for example a letter O for a zero, P2110 or P21111), runner or swirl flaps.
- The independent search stopped at its cap of 800 listed rows (789 qualified for the throttle study, and 55 more rows about pedal and position-sensor codes were set aside); the cap, not the supply, stopped the list. By the search's own samples, at least 400 further narratives that name a throttle body (diagnosed, replaced or cleaned, with no stall or power-loss word) and more than 1,000 further narratives that carry an "engine power reduced" message were identified but not listed, not sorted and not counted. The true number of complaints the first search missed is therefore above 789. The 2,042 complaints in complaints-not-sorted.txt and these further narratives are the complaints in the file that this study did not sort. found_by in the complaints file says which search found each complaint ("first search - code, sister code, runner or part + reduced power wording", "first search - part + other symptom wording (sample)" or "independent search").
- Final: 3,251 complaints; 2,726 relevant, 525 not relevant (a relevant complaint describes a throttle-control event on the owner's vehicle as defined above).
- After the settling of disagreements, a consistency check re-read 271 complaints that had been sorted into a cause category with "the problem came back" and applied the rules Rcons1 to Rcons3 and Rcons1b to Rcons4b above: 52 changed (resolution column: "changed in consistency pass").