Car Shuts Off While Idling or Driving? Causes and What to Do

Your car shuts off at a red light, or worse, at 45 mph, and half the dashboard lights up at once. If it starts again, that's a relief and also the problem, because a fault that comes and goes is a hard thing to show a mechanic.

The documented part is this: carmakers have already written up these stalls, in recalls and bulletins anyone can read. Ford recalled more than a million Focus compacts for a purge valve that can stall the engine at speed, and Honda wrote a bulletin for Pilots whose start-stop fails to restart them.

So where it happens tells you where to look. Below are the causes at a stop and on the road, what to do when it happens, the free repairs, and parts prices for five models with many stall complaints on federal record.

Why does my car turn off when I stop?

Your car turns off when you stop because the idle can't hold: at idle the engine runs on a small, steady trickle of air and fuel, and the computer trims it constantly. When something chokes the air it expects, upsets the computer's idle control, or drags on the engine as the car stops, the idle sinks until the engine quits.

Carmakers' bulletins and parts makers' guides name the causes below, starting with one that isn't a fault at all. Each has its own tell, so read them against what your car does.

1. Auto start-stop, which is normal

Some newer cars switch the engine off on purpose at a stop to save fuel, then restart it the moment you lift your foot off the brake. On a GM car the tachometer reads AUTO STOP while the engine rests, and Hyundai notes that a few warning lights may blink during the restart without meaning a fault.

So if the engine comes back by itself when you release the brake, nothing is broken. GM's manual adds one warning worth keeping: shift to Park before you get out, because the car is still on and can restart and move.

If the habit bothers you, some cars let you switch it off with a button. Hyundai labels its button ISG OFF, and GM notes that its trucks turn the feature back on every time you start the engine.

2. A dirty throttle body

The throttle body is the air valve between the air filter and the engine, a round plate that sits almost closed at idle. Carbon and gum build up around that plate, and the small gap it leaves at idle shrinks further, so the engine runs short of air just as you come to a stop.

Mazda and GM both describe it in bulletins: an unsteady idle or a stall right after the car stops, sometimes with no trouble code at all. Mazda traces it to carbon inside the throttle body, and GM, whose stalls came with the A/C on, has the shop clean it.

Ask the shop to clean it before anyone replaces it, and if it does get replaced, to run the idle relearn. SMP, a throttle body maker, warns that skipping the relearn after a replacement can leave idle drivability problems behind.

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3. A torque converter that won't let go

In an automatic, the torque converter is the fluid coupling between the engine and the transmission, and at speed a clutch inside locks the two together. It has to unlock as you slow down, or the engine stays tied to wheels that are stopping.

Subaru describes exactly that on some models with a CVT, a belt-type automatic: very low engine speed coming to a stop, like stopping a stick-shift car without pressing the clutch. GM and Mazda name stuck or worn converters on other models, so this one belongs with a transmission shop, and our CVT problems page covers the wider picture.

4. A/C load and idle software

Turning on the A/C adds a load at the exact moment the engine has the least to spare, so a weak idle can show itself first with the air conditioning running. Nissan and Subaru both fixed stalls coming to a stop with new engine computer software, one of them only with the A/C at full blast.

That makes a software update one of the cheapest fixes on this page, well under an hour of dealer time in the two bulletins that list one. Ask the dealer whether your car has an idle or stall update before anyone replaces a part.

Parts makers and two carmaker documents name five more, and these can also make a car shut off at idle, though we found few carmaker documents behind them on newer cars:

• Idle air control valveA small motorized valve that meters idle air on many older engines. Walker, Bosch and HELLA all list stalling when it sticks, and Walker adds stop-and-go traffic.
• EGR valve stuck openThe exhaust gas recirculation valve feeds some exhaust back in. Delphi and Walker list rough idle or stalling when it sticks open; we found no current carmaker bulletin that says so.
• Mass airflow sensorMeasures the air coming in. HELLA and Delphi list stalls or rough idle when it misreads.
• Camshaft actuator solenoidA valve that sets cam timing on some engines. GM's emission recall for some 2.4L engines lists rough idle and possible stalling at low throttle when one sticks, and a later bulletin replaces both.
• Vacuum leakA cracked hose behind the throttle lets in air the airflow sensor never counted. Chrysler's bulletin for one Jeep lists a vacuum leak code beside a stall at a stop, but its fix was software; a real leak sets a lean code, covered on our P0171 page.

Repair shops' pages add spark plugs and coils, a clogged fuel filter, low oil and overheating, at a stop or on the road. We found none of them behind a stall in the carmaker documents we read, so treat them as checks for the shop, not likely causes.

Idle stall documents12 documents

• 2020 Chevrolet Equinox owner's manualAt a complete stop "the engine may turn off" and the tachometer shows AUTO STOP; "Do not exit the vehicle before shifting to P (Park)."
• 2023 Hyundai Sonata owner's manualWhen Idle Stop and Go restarts the engine, some warning lights may come on for a few seconds from low battery voltage; "it does not indicate a malfunction". The ISG OFF button deactivates the system, and a second press turns it back on.
• 2019 Chevrolet Silverado 1500 owner's manual"If equipped, the automatic engine Stop/Start feature can be disabled" with the Auto Stop Disable Switch; "Auto Stop is enabled each time you start the vehicle."
• Mazda bulletin SB-01-007-09, 2003 to 2009 Mazda3, Mazda6 and othersUnstable idling or stalling just after the vehicle stops, with no codes; carbon deposits inside the throttle body.
• GM bulletin PIT3116B, 2002 to 2009 TrailBlazer, Envoy, Rainier, BravadaStall with the A/C on or extra load at idle; clean the throttle body; "may not set any diagnostic trouble codes".
• SMP, a throttle body makerAfter a throttle body is replaced, a relearn is needed, or idle drivability concerns can follow.
• Chrysler bulletin 1800822, 2021 Jeep Renegade 1.3LLists code P2173 (high airflow or vacuum leak) and, for other markets, a stall when coming to a stop; fixed with an engine computer update.
• GM emission recall 11195A, 2011 Equinox, Terrain, LaCrosse and Regal 2.4L; GM bulletin 17-NA-098A camshaft actuator solenoid "may stick, resulting in" a warning light, "rough idle, poor driveability, and/or possible stalling at low throttle opening"; the bulletin replaces both solenoids.
• Subaru bulletin 16-90-13R, 2010 to 2012 Legacy and Outback with CVTTorque converter lock-up pressure not released, giving very low engine speed when coming to a stop; a countermeasure converter.
• GM bulletin PIP4290A, heavy-duty trucks with the Allison transmission; Mazda SB-05-003-11, 2005 to 2008 TributeConverter clutch stuck on (code P0742), or internal converter wear, stalling the engine in gear at a stop.
• Nissan bulletins NTB13-058b (2013 to 2014 Sentra) and PM945 (2020 Kicks)Engine speed drops very low or the engine stops when coming to a stop; reprogram the engine computer, 0.4 hours on the Kicks.
• Subaru bulletin WTT-79R, 2017 to 2018 Impreza, 2018 to 2019 CrosstrekStall when coming to a stop or under 15 mph with the A/C at maximum; engine computer reprogram, 0.4 hours.

Why does my car shut off while driving?

A car shuts off at speed because something cut its fuel, its spark or the power that runs both, since at speed the engine already has plenty of air. Carmakers' recalls call that a crash risk, which is why several of the causes below come with a free repair.

The order below runs from fuel to spark to electrical power, then two causes that sit outside the engine: the key and the vapor system.

One event feels like a stall without being one: some Fords with a failing throttle body drop to near idle and light a wrench symbol, the reduced-power mode our engine power reduced page explains. NHTSA, the federal safety agency, notes that drivers may call that a stall, though the engine keeps running.

1. A failing fuel pump

The fuel pump sits in the tank and pushes gasoline up to the engine, so when it weakens or seizes, the engine runs dry and dies. Carter, a fuel pump maker, warns the engine may shut down completely during sudden acceleration, and lists wiring faults among the causes.

Toyota and Honda have each recalled more than a million vehicles for in-tank pumps that can stall the engine while driving, with the pump replaced free. So run your VIN, the 17-character vehicle ID, before you price a pump; the recall section shows how.

2. A crankshaft position sensor

This sensor tells the engine computer where the crankshaft is, so it knows when to fire the spark plugs and the injectors. Walker and Bosch, two sensor makers, list sudden stalling when it fails, and Chrysler recalls on some Jeep, Dodge and Chrysler models say a faulty sensor signal can stall the engine.

Delphi, another sensor maker, disagrees in part: it says a running engine tends to keep going, but is unlikely to restart once it stops. Either way, a stall followed by a no-restart fits this sensor, so tell the shop both and ask for the stored codes.

3. Battery cables, grounds and relays

Everything electronic in the engine runs on 12 volts, so a loose battery cable, a bad ground or a failed relay can shut the engine off along with the lights and radio. GM lists that whole pattern on its full-size trucks and SUVs: the engine stalls, the steering goes heavy, and the gauges, radio or climate control go blank.

GM's list of causes starts with the cheap ones: a poor body control module (BCM) ground, a starter cable rubbing on a heat shield, and loose or corroded battery cables. Recalls on Jeep, Dodge and Chrysler models add a fuel pump relay, an alternator and a power connector, and our battery or alternator test is the free first step.

Ford found a related fault in a pickup's fuse box, where one overheating fuse can stall the engine or stop it from starting. That one is a bulletin, not a recall, so a recall search won't show it.

4. The ignition switch and a heavy key ring

On cars with a metal key, the key can slip out of RUN into ACCESSORY or OFF while you drive, which turns the engine off. Chrysler's interim advice in one recall was to remove everything from the key ring, so a lighter ring is a free precaution.

On push-button cars, an engine that "just shut off" can come from the button itself. Toyota, Honda, Nissan and Hyundai all stop a moving engine when you hold the button about two seconds or press it three times, which is a safety feature that can surprise you once.

5. A stuck purge valve

The purge valve lets fuel vapor from a charcoal canister into the engine to be burned. GM says a valve that doesn't fully close can make the engine stall at idle, and our P0443 page covers the codes it sets.

Ford's version is the big one: on the Focus compact, a stuck-open valve can stall the engine at speed without warning and without a restart. Ford's first repair didn't always hold, so a second recall in 2026 calls those cars back even if they were fixed before.

Chrysler traced a stall right after filling the tank to the same system: a valve in the tank let liquid fuel into the vapor lines on some older minivans and cars. If yours dies just after a fill-up, tell the shop, because that points at the vapor system rather than the pump.

Stalls at speed13 documents

• Toyota and Lexus recalls 20V-012 and 20V-682, 2013 to 2020 modelsIncluding the Camry, Corolla, RAV4, Highlander and Tacoma: the low-pressure fuel pump may fail, and "the engine can stall while driving". Dealers replace the pump free.
• Honda recall 23V-858, 2013 to 2023 Honda and Acura models"Fuel pump failure can cause an engine stall while driving, increasing the risk of a crash." Dealers replace the fuel pump module free.
• Carter, a fuel pump maker"The engine may shut down completely during sudden acceleration." Wiring faults cause engine stalling and hard starting.
• Walker and Bosch, sensor makers; DelphiWalker: a failed crank sensor "can cause sudden stalling". Bosch: sputtering and stalling. Delphi: a running engine won't shut off, but once stopped it is unlikely to restart.
• Chrysler recalls 16V-907 (2016 Journey, Compass, Patriot) and 18V-049 (2017 Pacifica)A crankshaft or camshaft sensor that works only intermittently, or software out of step with the crank sensor, can stall the engine.
• GM bulletin PIT5405C, 2014 Silverado and Sierra 1500; 2015 to 2017 Silverado, Sierra, Tahoe, Suburban, Yukon, EscaladeEngine stall, power steering loss and a blank cluster, radio or climate control, "more likely" when stopped or slow and turning; BCM ground G218, starter cable, battery cables, a weak battery.
• Chrysler recalls 14V-530 and 19V-813 (2011 to 2013 Grand Cherokee, Durango), 14V-634 and 17V-435 (2011 to 2014 Charger, Challenger, 300, Durango), 15V-470 (2015 Chrysler 200)A fuel pump relay inside the power module, a failing alternator, and a power distribution connector, each able to stall the vehicle.
• Ford bulletin 15-0137, 2009 to 2014 F-150Crank no-start or stalling with several codes; heat at fuse F27 (20 amp) in the battery junction box; a fuse relocation kit, 0.6 hours.
• Chrysler recall 14V-373, 2009 to 2010 Chrysler and Dodge modelsThe ignition switch can move out of RUN and "the engine will turn off"; interim advice to remove all items from the key ring.
• Owner's manuals: 2021 Toyota Avalon, 2018 Honda Accord, Nissan Altima, 2023 Hyundai SonataA push-button engine stops while moving when the button is held about two seconds or pressed three times in quick succession.
• Ford recalls 18V-735, 19V-515 and 26V-369, 2012 to 2018 Focus 2.0LA stuck-open canister purge valve; "engine stall while driving, without warning and without the ability to restart". 26V-369 recalls cars repaired incorrectly under 18V-735.
• Chrysler bulletins 14-001-16 and 14-002-14; GM bulletin N222369620Stall right after filling the tank on 2004 to 2006 Chrysler minivans and cars, when a tank valve lets liquid fuel into the vapor system; on a 2019 XTS and 2020 Impala, a purge valve that won't close can stall at idle.
• NHTSA investigation PE13003, 2009 to 2013 Escape, Fusion, Mariner, Milan 2.5L and 3.0LThrottle body faults cause a limp mode, a reduced-power safety mode, limited to about 900 rpm; "drivers may characterize the reduced functionality as a stall".

What to do if your car shuts off while driving

Keep the car straight and stay calm, because a stalled engine doesn't take away your brakes or steering all at once. You keep some brake assist, but each press uses it up, and then the pedal gets much harder, and steering may get heavy depending on the car.

Owner's manuals from Hyundai, Nissan, Toyota, Honda and GM each cover part of it, and together they give the 4 steps below for when your car shuts off while driving:

1. Turn on your hazard lights. Ease off the gas and slow down gradually in a straight line.
2. Shift to Neutral and try a restart. Nissan and Toyota manuals allow restarting in N while the car is still rolling; on a push-button car, press the start button. Never shift into Park while moving, as Hyundai's manual says in plain words.
3. Brake steadily and steer with both hands. GM says to brake normally but not to pump the pedal, because the leftover assist gets used up with each press. GM's electric steering keeps helping until you stop, while Nissan says its assist is lost, so steering takes more effort.
4. Get to a safe place if it won't restart. Move off the road, keep the hazards on, and call for help.

If you have to stop a push-button engine yourself while moving, Honda's manual says to use both feet on the brake, because steering and braking take far more effort. The steering wheel won't lock, which is one less thing to worry about.

What the manuals say6 manuals

• 2023 Hyundai Sonata owner's manual"Reduce your speed gradually, keeping a straight line." Turn on the hazard flashers and try to start the engine again; don't move the shift button to P while in motion.
• Nissan Altima owner's manuals, 2013 and 2020"You may shift to N (Neutral) and restart a stalled engine while the vehicle is moving." Without the engine, the steering assist won't work and steering will be harder.
• 2021 Toyota Avalon owner's manualAfter the engine was turned off while driving, shift to N and press the engine switch to restart.
• 2012 Chevrolet Cruze and 2010 Chevrolet Malibu owner's manuals"Brake normally but do not pump the brakes." Some power assist remains, then the pedal is harder to push.
• 2010 Chevrolet Malibu owner's manualWith electric power steering, the assist "will continue to operate until you are able to stop the vehicle"; with hydraulic steering it takes more effort.
• 2018 Honda Accord owner's manualEmergency engine stop: steering and braking take "significantly more physical effort and time"; use both feet on the brake; "The steering wheel will not lock."

Why does my car shut off but restart right away?

It shuts off and restarts because the fault comes and goes: idle air, a converter that lets go once stopped, a hot fuse or a loose cable. That makes a quick restart the first clue to give a mechanic.

A car that won't restart points somewhere else. In the documents we read, the causes of a stall with no restart include a crank sensor, a stuck purge valve and an idle stop that fails.

The check engine light may stay off the whole time. Mazda, GM and Ford bulletins all describe idle stalls with no trouble code stored, so a clean scan doesn't clear the car.

On cars with start-stop, an engine that switches off and never comes back has a fix of its own. Honda tells owners of affected Pilots, Passports and Ridgelines to select Park and press the start button, and its later fix replaced the starter and its relays and adjusted the valves.

If your car starts and then dies within seconds, our guide to a car that starts, then dies picks it up from there. Before you call a shop, note these details, because they're what a mechanic needs to find why a car shuts off:

• Where it happenedAt a stop, while slowing, while turning, or at speed.
• Whether it restartedRight away, after a wait, or not at all.
• What came firstFlickering lights or a dark dashboard, a battery light, or nothing.
• What was runningThe A/C on high, or a fill-up just before.
• Any warning lightA check engine light, a wrench, or AUTO STOP on the tachometer.

Restart clues4 documents

• Ford bulletin SSM 45922, 2013 to 2016 Escape 2.5LRough idle, low idle speed or a stall on hot restart "with no DTCs", from a seized A/C compressor clutch.
• Honda bulletin 23-008, 2016 to 2022 Pilot, 2019 to 2022 Passport, 2020 to 2023 Ridgeline with idle stopAfter idle stop engages, the vehicle may not restart automatically; "Typically, the customer can immediately restart the vehicle by selecting Park and pushing the ENGINE START/STOP button." Software update, 0.2 hours.
• Honda bulletin 23-009, 2016 to 2021 Pilot, 2019 to 2021 Passport, 2020 to 2021 RidgelineCause: "excessive cylinder pressure and/or low cranking torque"; replace the starter and starter relays and adjust the valves; coverage extended to 10 years from the original purchase date.
• GM bulletin PIT5391, 2014 Silverado and Sierra 1500; 2015 Silverado, Sierra, Suburban, Tahoe, Yukon, EscaladeOwners may report "a no crank or a start then immediate stall condition", which can come from the ignition run relay not switching on.

Is it safe to keep driving a car that stalls?

Not until the cause is found, because a car that shuts off in traffic raises the risk of a crash. That isn't our opinion: the recalls for stalling fuel pumps and purge valves say it in those words.

None of the documents we read says a stall damages the engine itself, so the danger is the road, not the motor. Until it's fixed, keep trips short and away from fast traffic, and get it to a shop soon.

The one exception is auto start-stop doing its job. An engine that rests at a light and wakes up when you lift off the brake is a feature, and it needs nothing but the occasional reminder that it's on purpose.

Can a recall fix a car that keeps shutting off?

Sometimes, yes, because a stall at speed is a safety defect, and safety recalls are repaired free at the dealer. Some idle stalls are covered too, but by bulletins and extended warranties that a recall search won't show.

Several of those extended warranties have closed, so don't count on one: Subaru's CVT coverage on older Outbacks and Ford's throttle body program are over. Honda's starter coverage for the Pilot runs 10 years from purchase, so the oldest Pilots are aging out of it.

Each layer shows something the others miss, so check all three, cheapest first, with the 3 steps below to find a free fix when your car shuts off:

1. Paste your VIN into our free VIN checker. It lists the NHTSA recall campaigns for your car's make, model and year, so you see what exists.
2. Run your VIN at NHTSA. The NHTSA recall search shows which recalls are still open on your car, including a repeat recall like Ford's second one on the Focus.
3. Ask a dealer about bulletins and extended coverage. These aren't recalls, so neither search shows them; the dealer looks them up by VIN.

Free fixes and their limits5 documents

• Ford recalls 18V-735 and 26V-369, 2012 to 2018 Focus18V-735 covered 1,282,596 vehicles in 2018; 26V-369, filed June 9, 2026, recalls 257,868 of them because the earlier repair was done incorrectly. The new remedy is software.
• Honda recall 23V-8582,490,460 vehicles; dealers replace the fuel pump module free.
• Honda bulletin 23-009, 2016 PilotWarranty extended to 10 years from the original purchase date, no mileage limit, so for a 2016 it runs out around 2026.
• Subaru bulletin 16-107-17R, 2010 to 2015 Legacy and OutbackCVT coverage extended to 10 years or 100,000 miles, "not in response to any specific condition"; the 10 years have passed for a 2011.
• Ford program 13N03, 2009 to 2013 Fusion, Escape and othersThrottle body coverage for 10 years or 150,000 miles, or through January 31, 2015 for older cars; closed.

How do you fix a car that keeps stalling?

You fix it by finding the cause before you buy a part, checking for a free recall, then cleaning or replacing only what failed. Parts for the causes priced here run from about $11 for a crankshaft sensor to $394 for a fuel pump module, with one Subaru throttle body at $628.

The box below prices the parts for five models with many stall complaints, one row per part. Labor follows in a table, from the carmakers' own book times where they publish one.

Labor is the carmaker's book time, the hours a dealer is paid for a job, times an independent shop's hourly rate. A 2025 survey of 752 US repair shops found almost half charging $120 to $159 an hour, and that band is what the table uses.

The Pilot row is Honda's whole idle stop package, not a starter alone; the Outback row is Subaru's 3.8 hours to remove and refit the CVT plus 0.1 for the converter. No carmaker document we found gives a time for the fuel pump module, throttle body or crank sensor on these five cars, so those stay parts only.

The F-150's fuse relocation kit is a Ford dealer part and the Outback's converter wasn't priced, so ask the dealer for those two part prices. Either way, the cheapest repair on this page is a free recall you didn't know you had.

Book times5 sources

• Ford program 24N07, 2012 to 2018 FocusPurge valve replacement, canister inspection and a code check, 0.6 hours (operation 24N07B).
• Ford bulletin 15-0137, 2009 to 2014 F-150Inspect and relocate fuse F27 with kit EL3Z-14293-A, 0.6 hours (operation 150137A).
• Honda bulletin 23-009, PilotReplace the starter and starter relays and adjust the valves, 2.8 hours (template A23009B).
• Subaru bulletin 16-90-13R, 2010 to 2012 Legacy and Outback CVTCVT removal and refit 3.8 hours, torque converter replacement 0.1 hours, line pressure test 0.6 hours, each listed on its own.
• PartsTech's 2025 survey of US shops, as reported by MOTORAlmost half of 752 shops charged $120 to $159 an hour.

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Common questions

Asked most often

Why does my car shut off when I stop but starts back up?

The carmakers' bulletins point at idle air: a dirty throttle body, a converter that won't unlock or idle software that lets the engine speed sink as you stop. On a newer car it can also be auto start-stop, which restarts by itself when you lift off the brake.

What sensor causes a car to shut off?

The crankshaft position sensor: without its signal the computer can't time spark or fuel, and some recalls say a faulty one can stall the engine. Parts makers also list the airflow sensor.

Why is my car shutting off randomly without a check engine light?

Because several stall causes set no code. Carmaker bulletins describe idle stalls from carbon in the throttle body, A/C load and a seized A/C clutch with no trouble code stored, so a clean scan doesn't clear the car.

Is it normal for a car to turn off at a stop light?

On a car with auto start-stop, yes: the engine switches off to save fuel and restarts when you release the brake. Without that feature, or if it doesn't restart by itself, it's a fault worth checking.

What should you do if your engine stalls while driving?

Turn on the hazards, keep the car straight, shift to Neutral and try to restart, and never shift into Park while moving. If it won't restart, brake steadily without pumping and steer to a safe place.

Why will my car start but won't stay running?

If it dies within seconds of starting, the starter has done its job, so look at air, fuel or a sensor signal rather than the battery. Our car won't start guide covers that case.

Prices are ranges compiled in October 2026 for the US market and vary by region, engine and shop rate. Prices from $10 up are rounded to the nearest dollar, so $14.13 reads as $14 and $14.52 as $15. Below $10 they're exact. This article is general information, not advice about your specific vehicle. See the disclaimer.