Why does my car shake in Drive but not in Neutral or Park?
Because in Drive the transmission loads the engine against the mounts, and the documents put most of those shakes on the mounts or the driveline.
The details
GM's bulletin for its 4.3, 5.3 and 6.2 trucks and SUVs says the rough idle in Drive 'will not be present in Park or Neutral' and traces it to ground-out inside the engine mounts. Other makers name a torque converter (Ford's 2.3 Explorer and MKC, some 2026 Hyundai Santa Fe and Santa Cruz 2.5T), the transmission's neutral-idle function (GM, Hyundai), or an idle speed set too low for the gear (GM Colorado 2.5), and Nissan raises the idle on some Rogues.
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Related questions
Why does my car vibrate at idle when there is no misfire?
In the 293 manufacturer documents PulsCar went through, a shake at a stop that is not a misfire comes from five places: something touching the body (a radiator bracket, a heat shield, a cable, a fuel line), idle speed or software set too low for the engine, the A/C and accessory load (an alternator pulley, a compressor bracket, a fan), the engine and transmission mounts, and the driveline in gear (a torque converter, the transmission's neutral-idle function, a cracked flexplate). A misfire is the other big family: if the check engine light is on or flashing, or a code from P0300 to P0312 is stored, start with our P0300 guide instead.
Can the A/C make a car vibrate at idle?
Yes. The A/C adds load at idle, and the documents describe three ways it shows up: an idle that drops or hunts when the compressor engages (Kia's software and alternator pulley for the 2013 Sorento were issued to improve idle rpm stability, 750 to 680, at a stop with the A/C on), a Jeep Cherokee 'shudder at stop/start with A/C on' fixed with a reflash, and a vibration that exists only while the compressor clutch is engaged, which GM traced on Camaros to over-torqued compressor-bracket bolts. In our complaint set, 37 owners said the A/C brings the shake on or makes it worse.
Is it safe to drive a car that vibrates at idle?
Usually, if it drives normally, the engine does not stall and no warning light is flashing. A flashing check engine light points to a misfire: pull over safely, switch the engine off and have the car towed; the one exception, our advice, is a shop within 2 to 3 miles, reached gently, under 40 mph and light on the throttle. Stop and have it towed when the steering wheel shakes with a power steering warning or when the engine stalls at stops. In our reading of 2,166 relevant federal complaints, 186 describe a steering wheel that shakes at a stop together with a power steering word, most on 2008-2011 Escapes and Mariners and 2005-2012 Malibus, G6s and Auras.
Go deeper
The full guide: Car Vibration at Idle (2026): Mounts, Gear, A/C and Idle Speed.