Skip the auto shop - Our mechanics make house calls

Q: My Jeep has a full battery but is not starting every time I go to start the car.

asked by on

The car will sound like it is about to start but simply does not crank. I have a 100% battery but is simply will not crank. I feel like there is something electrical wrong. If I wait for the "Lightning Bolt" Light on my dash that I believe is for the Electronic Throttle Control to go off after about 15-20 seconds, the car will often start once the light is off? What the heck is going on.

My car has 80000 miles.
My car has an automatic transmission.

Hi there. There are several possible causes for the lightening bolt to remain on. The PCM (powertrain control module) has recognized an electrical fault in the ETC (electronic throttle control) system and disables the starter relay, creating a no crank situation. This could be from a faulty APP (accelerator pedal position) sensor, a faulty TPS (throttle position sensor) at the throttle body, or an electrical fault in the TIPM (totally integrated power module). Replacing components without proper diagnoses could be expensive and time consuming without a proper resolution. I recommend having your vehicle’s cranking problem diagnosed and repaired by a certified technician, such as one from YourMechanic.

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
  • My Jeep has a full battery but is not starting every time I go to start the car.

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: Car won't start

Claimed by Jeff Engstrom

Q: Could my fuel pump be bad after running out of gas?

Hello There, It sounds like you may have a faulty fuel pump that may have been damaged as a result of running it out of fuel. As you may know, today's fuel pumps require the fuel to keep them cool...

Q: Can i buy a used pcm and have the dealership reflash it to my car?

Hello, thanks for writing in about your Dodge Challenger. From what you've described, this is a question you'll have to ask the dealer. Most PCM's I know of do not let you reprogram them to a different vehicle VIN number...

Related articles

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...
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.