Skip the auto shop - Our mechanics make house calls

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.

Was this answer helpful?

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

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Brake pedal too close to gas pedal - 2010 BMW 335d

The most practical way to deal with this is to consciously practice moving your foot further to the left when braking. It's not likely any shop would modify your brake pedal to move it to the left - for liability...

Q: Having trouble diagnosing a stalling issue, do I need a new fuel pump?

If the engine is not getting fuel then it may need a fuel pump. I would start by checking to see if the engine is losing spark or fuel when this occurs. Knowing if the problem is spark or fuel...

Q: Car is not starting up or staying running when jumped.

The very first thing to do is ensure that you have a usable battery. The battery should be fully charged and then load tested. If the battery passes a load test be sure it is NOT a marginal pass in...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.