P0641 Diagnostic Trouble Code Discussion for November 2016
5-Volt Reference 1 Circuit Malfunction
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| Help Request | Posted | |
| 2003 Chevrolet Silverado 1500 WT 4.3L MIL Lamp on, hard start VIN: 1GCEC14V23 P0641: 5-Volt Reference 1 Circuit Malfunction. ... and P0641, fault tracing says this happens if reference voltage is too high or low. Faults were cleared a few months ago, truck was driven cold and hot, harnesses were wiggled and examined. No repairs were made. Now P0651 and P0641 are back, along with P0... |
November 02, 2016 | |
| 2007 Cadillac Escalade 6.2L Poor Idle Quality, Cuts out VIN: 1GYFK63817 P0641: 5-Volt Reference 1 Circuit Malfunction. Hello, and thank you for your help. I have this Caddy that has a 5v ref problem, I tested it at the MAP sensor and I have 2.2v. I started unplugging sensors until my 5v came back which it did when the oil pressure sender was disconnected. OK that was easy, rep... |
November 03, 2016 | |
| 2003 Chevrolet Silverado 1500 WT 4.3L MIL Lamp on, hard start VIN: 1GCEC14V23 P0641: 5-Volt Reference 1 Circuit Malfunction. ... and P0641, fault tracing says this happens if reference voltage is too high or low. Faults were cleared a few months ago, truck was driven cold and hot, harnesses were wiggled and examined. No repairs were made. Now P0651 and P0641 are back, along with P0... |
November 08, 2016 |
