Skip the auto shop - Our mechanics make house calls

Q: Engine turns off when driving, cannot restart

asked by on

After having both my catalytic converters replaced, I went to get the vehicle. A 1/2 mile later the car just shut off at 30mph. No warning lights, no sputtering. It's as if someone reached over and turned off the key. Attempting to restart it, the engine would begin to turn over for a fraction of second then stop. Almost like a battery was too low to crank. Shop inspected & Scanned codes:

P154500 - Throttle valve control system Malfunction P157900- Throttle valve control module, J338, Adaptation not initiated P10A700 - Adaptation regulating flap for intake air soiled

Replaced battery battery, Inspected throttle body, and it moves freely. Plugs and coil packs new. The car eventually just decided to start, but it would stall immediately every time right after startup. Adapted throttle body, and the car did start and run seemingly ok. Drove 15 miles, and died on freeway.

Scanned again: P154500, P10A400, P164D00 Cannot get it to turn over. Now mechanic says there are trans. codes

My car has 68000 miles.
My car has an automatic transmission.

A: Hello. It sounds like you have a voltage pr...

Hello. It sounds like you have a voltage problem. It may be a bad connection at the battery or at one of the ground connections. Both will commonly occur. Any loss of voltage will cause some serious module communication issues. If the battery, alternator, and connections are fine then it may have a bad module. I have seen quite a few module issues on many Audi's if the battery was not disconnected when the new converters are installed (because the welding can damage the circuit). A mobile mechanic may be best suited to address these issues. If you would like, a certified technician from YourMechanic can come to your home or office to inspect your electrical wiring, and make necessary repairs.

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

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: Noise coming from the engine

The noise would need to be heard by a mechanic to determine if it is an engine noise, or ignition problem. The code P0455 is a generic code for a major emission vapor leak, and is most common to be...

Q: Transmission fluid

If you are having problems with your transmission, assuming that your vehicle is equipped with a dipstick to check the fluid level, first make sure the fluid level is correct. Incorrect fluid level can cause transmission problems. Assuming normal service...

Q: I was driving and sudenly i noticed car is stopping so i pulled over and noticed the radiator cap came out

If the vehicle overheated, that alone can cause a no start condition due to fuel vapor lock. If, once the vehicle has cooled down, it still won't start, that can be resolved if you request a no start diagnostic. The...

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...