2006 Grand Cherokee PCM Issues

[bobperry80]

Hello, I have a 2006 GC that I am having an issue with. I had it in the garage doing some brake work and putting a water pump on it, when I was done I got in it to start it, it started, ran for about 5 seconds and shutoff, I started it again and the same thing happened, the third time I got nothing, I had all my dash lights but it wouldn't turn over. I done a bunch of trouble shooting and kept coming back to the PCM. I found a used PCM and put in it and the exact same thing happened looking like I smoked another PCM. Any help n diagnosing this issue before I put another PCM in it would be greatly appreciated. possible over charging condition? Electrical short somewhere?

 

[k-2]

keep original PCM!

Scan and post ALL current codes.
Tell us what troublehooting you did?
Is the security ligh on or was It on?
Will need to use a scanner, NOT key on off trick.

PS Where was ign key during the work done?

 

[JPNinPA]

If you hold the gas pedal down a bit when starting, does it continue to run?
Are all battery and grounds clean and tight? Including the engine ground?


Overcharging is unlikely during startup.

Regards,
JPNinPA

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