p0642
#1
09-08-2010, 10:54 AM
p0642
Code: P0642
Modules: ECM
Description: 5-Volt Reference 1 Circuit Low Voltage
This tells me it could be anything with a 5v reference. I changed the oil pressure sensor, pedal assembly, getting a fuel pressure sensor, and possibly a MAP sensor, and i cleaned the ecm, plus reflashed it.
Truck runs normal up to about 45-50, then craps out starts rattling, no smoke though, pedal goes dead then comes back, oil pressure gauge goes crazy, but logging with efi shows no change in oil pressure. Will come back around and be normal til you pick up speed again, then repeats.
I've asked on every other diesel forum i'm a member of, not many seen the problem.
Modules: ECM
Description: 5-Volt Reference 1 Circuit Low Voltage
This tells me it could be anything with a 5v reference. I changed the oil pressure sensor, pedal assembly, getting a fuel pressure sensor, and possibly a MAP sensor, and i cleaned the ecm, plus reflashed it.
Truck runs normal up to about 45-50, then craps out starts rattling, no smoke though, pedal goes dead then comes back, oil pressure gauge goes crazy, but logging with efi shows no change in oil pressure. Will come back around and be normal til you pick up speed again, then repeats.
I've asked on every other diesel forum i'm a member of, not many seen the problem.
