Skip the auto shop - Our mechanics make house calls

Q: After changing the accelerator position sensor, the car will not start.

asked by on

After changing the accelerator position sensor, the car will not start. We were told to disconnect the battery and then hold the positive and negative cables together for a minute to reset the computer. We did this and the car still would not start. We then re-connected the old sensor (without mounting it on the bracket) and still no start. Theoretically (according to the parts people) the sensor required nothing to be reset. I just hooked up a battery charger at a 2 amp charge rate and it indicated 12 volts with 40% charge. We'll see, in the morning, if a full charge changes anything. If it doesn't we are at the end of our current knowledge of what to do! Any help will be greatly appreciated. While not totally ignorant in electronics, I'm far more comfortable with the mechanical end of things.
My car has an automatic transmission.

Hi, thanks for writing in. We get this question quite often. Holding the battery terminals aren’t supposed to clear error codes stored in the ECM. The correct procedure for clearing error codes that were stored in your ECM when the accelerator position sensor was damaged, is to connect a professional digital scanner and reset the codes. This needs to be done by a mechanic that has this type of device. Contact one of our local mechanics that can show up to your home or office to complete a check engine light reset inspection for you.

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
  • Home
  • Questions
  • After changing the accelerator position sensor, the car will not start.

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: My 2500HD wont fire. But its turning.

Check to see if there are any stored diagnostic trouble codes. Be sure you have a fully charged battery that passes a load test. Confirm that the engine immobilizer system (security system) is not activated thus preventing the car from...

Q: Tranny

The first thing that needs to be done is to scan the vehicle for all codes. Since the overdrive light is flashing, a simple code reader from your local parts store will not likely be of any help. Code readers...

Q: Whenever i touch my car -Just a little touch the whole car shake as if it will turn upside down.

Hello. It sounds like you have weak springs or struts. It is heard of for those to weaken and produce the concerns you speaketh of. Springs, shocks, or struts are suggested to be replaced every 50,000 miles. I suggest having...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...