× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network

P0641 Diagnostic Trouble Code Discussion for September 2014

5-Volt Reference 1 Circuit Malfunction

Note: This is a professional automotive technician's resource.
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Trouble Ticket Help Requests for DTC P0641
Help Request Posted
2009 GMC Sierra 1500 SLE 5.3L No Start, MIL Lamp on VIN: 1GTEK29079
P0641: sensor ref volt A open. ... while the truck will crank but not start. If he turns the key off, and then tries again, it will start. Someone here has witnessed It one time. The Check engine light is on all the time. The P069E is obviously set because of problems elsewhere. I cleared t...
September 08, 2014