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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 29457
Experience:  GM Grand Master Technician 2007. 14 years experience.
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Chevrolet C3500 4x2: I have a 2006 c3500 would not start cranked

Customer Question

I have a 2006 c3500 would not start cranked over great
After checking for fuel leak and none detected
I unplugged the two large connectors over drivers valve cover
Started right up
Submitted: 1 year ago.
Category: Chevy
Expert:  GM Tech (Cam) replied 1 year ago.
Hello, I'm Cam.
Can I get your first name please?
Sorry to hear about this. I suspect you have a bad connection around the 2 connectors. By that I mean a connection issue inside the connectors or even a wiring issue very close to that controls or reads one of the sensors.
So what I recommend you do is this. Carefully inspect each wire as it leaves the connector on both sides. Check for spots of corrosion, wires that stretch when you pull on them, and pull as far back as you can. I have seen wires with breaks as far back as 3" from the connector. See if the terminals are loose inside.
If you find nothing then clean up the wiring, put some dielectric grease in the connector and see if your issue ever returns.