2000 b1500 5.2 pcm issue help.

07-21-2009, 04:33 PM
I am having the same symptoms as everyone else. Runs good when cold, stalls at lights, stalls in general, no bus error, etc. Heres the thing, I pulled the pcm just to have a look inside for fun. Hooked it back up and started van. Van ran good so I started to bolt the pcm back in with van running. As soon as the first bolt sucked the pcm to the bracket, van quit. Hmmm so I removed the pcm and let it sit on top of the radiator hose and still couldnt get it running. finally after a while it started again and I started bolting it again and bam, as soon as it touched the metal it quit. I have tried to run it not touching the metal and that doesnt fix it. Only time fixes it. What should I try next? New pcm? Thanks in advance for any help I may recieve.

07-21-2009, 07:08 PM
What should I try next? New pcm?

Yes a new one, or at the very least get a used one from a junkyard or off eBay.

07-21-2009, 08:32 PM
What do you think about the issue when the pcm hits metal and shuts off the van? Maybe a open circuit in the pcm that is shorted to the case? Of course I cant seem to find one anywhere in minnesota. Ebay may be the only option. What am I going to spend on one? Does it have to be flashed to my VIN? Thanks

07-21-2009, 09:52 PM
Okay I got it to run in 15 sec spurts. Everytime it killed it was due to the fuel pump relay dropping out. So does this still point to PSM replacment?

07-21-2009, 10:02 PM
Since the PCM controls the fuel pump relay, you're still faced with the possibility of a bad PCM.

Try these sites:


07-22-2009, 08:21 PM
Okay I thought that the truck and the van ecm's were the same. Nope. I cant seem to find my ecm with any junkyards or rebuilders. Anyone that can help?
Part number is: p56040389ab

07-22-2009, 09:05 PM
$254.00 Rebuilt

07-22-2009, 09:11 PM
Oh and by the way, the number for your PCM is just 56040389ab, there is no "p" at the front of it.

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