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PCM is from an 03 express van. Cluster is from an 05 2500HD M/T. Everything works except for the voltage indication. It is supposed to come from the BCM or GBCM on the 05 from what I can tell. I have a GBCM or SAVRC from an 05 1500, but no luck yet. I see that 04 1500's feed the voltage to the IPC from the PCM. Can I get my 03 PCM to feed the cluster the voltage PID that the 05 cluster is looking for?
Should I take a stock file for an 04 Silverado and write all my tables to it?
My tune has OS ID 12779405 & system 12571966. I have a file from an 04 that is OS 12587603 and system 12585937.
Well I took the 04 PCM i had and plugged it in. With the key on, no change in volt meter. Started it up for a second until VATs kicked in, this is not a tuned PCM, No voltmeter. There goes that theory..