1997 OBS PSD
I've had a lot of issues with this truck lately. It mostly started with it dying when driving and not starting again for about 30 min. I was able to trace that back to a bad IPR
valve. In the process I also changed out the CPS
sensors. Also replaced injector O-rings. I also replaced the IDM
a long time ago with a reman (something unrelated, and maybe not necessary in retrospect)
Truck was fine in the cool weather after that, but now that its getting warm the truck is dying again. Once that truck is hot, it will randomly die when idling. It then fires right back up. It might run for 15 seconds when hot, and then it suddenly dies like someone turned off the key. No check engine light or anything.
No codes when I scan for them, but I checked for codes when it died and I got Code: P1668 - PCM
and Injector Driver Module Communications Error
Module: Powertrain Control Module
Diagnostic Trouble Code details
Powertrain Control Module (PCM
- Injector Driver Module(IDM
) communication error.
- Open or shorted IDM
EF (feedback) line.
- Open or shorted Fuel Delivery Control Signal (FDCS).
- Open IDM
- Damaged or unpowered IDM
- Damaged PCM