Anti-theft causing vehicle to shut off after three seconds

AARON212

MEMBER
2000 JEEP GRAND CHEROKEE
4.0L
6 CYL
2WD
AUTOMATIC
200,000 MILES

I have the vehicle listed above that me and a professional locksmith have been trying to start for 3 days. We have finally got it to start but it shuts off after 3 seconds. We have replaced the immobilizer under the column twice, the PCM twice, reset everything, he has done you name it with all kinds of computers and devices, made countless keys and reprogrammed everything that can be reprogrammed. What is shutting down my vehicle? Please help because this is driving me insane and has cost me and my wife to miss two days of work.

1 Reply

AL514

MECHANIC
4,677 POSTS

Hello thanks for using 2CarPros. First thing is to put the original ECM and immobilizer unit back in the car. These are programmed to work together. Changing them and switching them around will only cause more problems. You will need someone with a scan tool to reset them back to factory specs if that's the case. Put the original modules back in and try disconnecting the battery cables and touch them together. This will reset the entire system. Here's a rundown about the security system: https://www.2carpros.com/articles/how-to-reset-a-security-system