JimDD

What does that mean? Do I pay you?

Code is P1688Auxiliary imputManufacturer controls

Ill go borrow a code reader. Where do I attach the fuel pressure guage?

My 1999 dodge diesel has been running fine except for rpms going up and down at 45 mph. Below that its fine and above that its fine. Thats just background info though. The truck just died. It cranks but wont start. I replaced the lift pump a while back as well as the throttle position sensor. Truck ran for a few months after that. I dont have a code reader and toggling the key does not generate any codes. Not sure where to turn to next. Any ideas? BTW the truck has 175k miles on it.