• Welcome to The Truck Stop! We see you haven't REGISTERED yet.

    Your truck knowledge is missing!
    • Registration is FREE , all we need is your birthday and email. (We don't share ANY data with ANYONE)
    • We have tons of knowledge here for your diesel truck!
    • Post your own topics and reply to existing threads to help others out!
    • NO ADS! The site is fully functional and ad free!
    CLICK HERE TO REGISTER!

    Problems registering? Click here to contact us!

    Already registered, but need a PASSWORD RESET? CLICK HERE TO RESET YOUR PASSWORD!

Optical sensor

I don't have one, but thoes 4 codes together are usually signs of a bad injection pump. Gm issued a TSB stating to replace it if those codes are found. Obviously you want to check the wiring and for any air in the fuel. But everytime I see that combination of codes on a customers truck its been a bad pump
 
if it will start, it usually takes a little bit longer cranking time for it to fire off with one of the two disconnected. do you have a scanner to read if you are getting rpm signal?
 
Back
Top