GMC Troubleshooting Questions? Ask a Mechanic for Answers
Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.All engine fault codes start with a P, can you recheck your code and post back with the correct code as well as explain what type of problem you are actually having, you question is not clear to me and if you can explain in detail, I will try and help you .
One very common caused for these codes to set is a bad ground which can also cause the love voltage to the pump. Check G104 and G105 at the Right Front (RF) corner of the engine and frame rail to be sure there clean and tight.
Did you also check the engine to frame ground strap?
The drop may be at the fuse panel, with the key off and the "Battery" light do you have battery voltage on Fuse 22 (IGN E) in the Underhood Electrical Center ?