Q: Car shuts off sporadically

asked by on

My car has had an intermittent problem with shutting off completely at certain situations. This occurs both while braking to a stop, like at the traffic light, as well as while accelerating from a stop. The car would shut off in these conditions and always at lower speeds. I would then have to put it in park and start it up again. There are no problems with starting the car. It starts immediately. The dealers cannot recreate the problem so they cannot solve it. No error codes came up. The repairs done so far include the alternator replacement and throttle valve control unit carbon buildup cleaning. What could be causing this?

A: There are numerous potential causes for you...

There are numerous potential causes for your problem. One common issue with Volvos such as yours, is a faulty Electronic Throttle Module (ETM). It sounds like you had it cleaned, but it may need to be completely replaced. Using inputs from various sensors including the accelerator position sensor, the ECM uses a motor to open and close the throttle. A malfunctioning ETM can lead to engine performance problems such as stalling. I suggest you have your vehicle inspected by another mechanic to diagnose the stalling issue and see if this is indeed the problem. The team at YourMechanic is an excellent option since we make house calls.

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Sputtering and not accelerating. Maybe fuel pump.

A weak fuel pump is indeed a possibility. Fuel injectors and fuel filter being clogged could also cause this issue. I would recommend having the fuel pressure checked first by a professional from YourMechanic. If the fuel pressure is low...

Q: oil is leaking onto the MAP sensor...and is intermittently stalling

If you were told that the upper intake needs to be replaced then this may cause problems with the MAP sensor and the way the engine runs. A MAP sensor is very important to controlling the fuel strategy to the...

Q: Car refusing to start

It sounds like to problem is with the ignition switch. If your lights come on when commanded and the vehicle won't turn over this is most likely the issue. If you have no power to anything you could have a...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.