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.

A: Hi there. There are several possible causes...

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

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: Starter spins occasionally

Hello there, thank you for asking about your 1985 BMW 635CSi. My repair database does not show information regarding the Euro spec model. However, to replace the starter on the 635CSi, you do not need to remove the intake manifold....

Q: Oil pressure drops to zero when engine is hot and idling

Hello, This suggests that one of two things are happening. Either the motor is in fact low on oil or the oil pressure sending unit is not working properly and may be producing a faulty reading. I would recommend first,...

Q: No Crank No Start, dashboard lightup with No Bus warning

Considering the problems at hand it may be best for an in person diagnosis of the situation. The problem could be as simple as a failed sensor or broken wire, or the power-train control module itself going faulty. Considering the...

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...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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.