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Chad 5/15/2020

2008 Jeep Wrangler (JK) Rubicon 6 Cyl 3.80L


All dash lights come on but NO CRANK

Hello! Please forgive me if I am posting this in the wrong section. I own a small dealership and we have a 2008 Jeep Rubicon automatic that has us all stumped and we have tried everything we know! I drove the Jeep several hundred miles after purchasing to sell with no issues. I had a new driveshaft put in and took it for a test drive and after I switched the ignition off it never started again....That was 3 months ago. All the dash lights come on as normal and everything works when in the ACC position, but once you turn the key to crank all you hear is a thump at the gear shift and nothing. (You also hear the thump if just pressing the brake and not trying to crank) We noticed the starter wire fell on the exhaust and was burned, but even when we repaired that, still the same thing. So we carried it to the dealership and they said the wire shorted the TIPM and wanted to charge $1,800 to replace. Below is a list of everything that has been done with no resolve!
1. Tested the

1 Answer


Jimm 5/16/2020

Diagnostic work on these systems is pretty straightforward. You should always check all the powers and grounds to the TIPM then check the connections as well as the inputs and outputs.
Once you have narrowed down the TIPM as the source of the problem, the replacement is simple. Even though technically the TIPM does not need to be programmed, it does need to be configured to the car. Therefore, a "Restore Vehicle Configuration" will be needed, which requires the VIN to be entered into the TIPM.

One method that seems to work well, but not all the time, is to close the hood and turn the ignition key to the "RUN" position while waiting at least twelve seconds. The TIPM will collect the necessary vehicle configuration and VIN data from the PCM on its own. After twelve seconds, turn the ignition key to the "OFF" position and then back to the "ON" position and verify proper vehicle system operation. Of course, the PCM (and CCN) has to be in working order for it to function properly. I've had limited success with this method because the tire ratio may not transfer over. That's when I have to break out the scanner. On some occasions, even though it's rare, the anti-theft system locks out the starting signal, which requires getting the four-digit security code from the dealer and using a scanner to restore the theft deterrent system.

TIPM rebuild sources:

New or rebuilt / exchage ranges from $595.00 to $395.00


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