Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
Trying to help someone on the Corvette Forum from Prague...2001 M6 with 5.7 liter and while driving he has all the DIC messages and a bunch of "no comms"...I'm very familiar with this class 2 data bus issue and when I had him check pin 2 (data line) key KOEO he was seeing 10 volts...I had him remove BOTH splice pack combs and check each module with DVOM and he is seeing around battery voltage on every module wire...HUH ??...in this condition the car will not start unless the BCM and PCM module wires are jumpered together...he says the car will start and run and he has a video of it......STUMPED !!!
