View Full Version : 99 to 2001 PCM upgrade Battery light?
Quick6
February 26th, 2006, 01:18 PM
I fllashed my 1999 5.3 truck PCM to a 2001 operating system and upgraded to COS3, everything went great, except I have the battery indicator flashing on and off in my message center. Does anybody know how to disable that light?
87gmc
March 2nd, 2006, 12:33 PM
theres a certain one mil you have to disable because 99 didnt use them. I had the same problem ill look through my bin and see which one it is and get back to you.
Quick6
March 3rd, 2006, 01:47 PM
Thanks, please let me know. I have been looking at wiring diagrams to see if they did something different with the alt wiring.
87gmc
March 3rd, 2006, 03:51 PM
Scan which code it is setting and turn it off. I believe it is p1638 but i could be wrong
Quick6
March 4th, 2006, 02:21 AM
I'll check it out today. I didn't think to scan it because a the MIL was off.
87gmc
March 6th, 2006, 07:09 AM
yea it doesnt show a MIL but i believe on that parameter you need to set it from a C to an X on reporting:beer:
Quick6
March 11th, 2006, 07:35 AM
P1638 did it, thanks for your help!:thankyou2:
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