P0641 Diagnostic Trouble Code Discussion for November 2022
5-Volt Reference 1 Circuit Malfunction
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| Help Request | Posted | |
| 2014 Chevrolet Sonic LT 1.8L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G1JC5EH0E P0641: 5v reference 1 circuit. Vehicle has intermittent but consistent problem. When I first saw the vehicle (house call), it had codes for every sensor on these 4 reference voltage circuits, and ran poorly - misfire, rough idle, fuel odor. Dash display stated Low Power. Fast forward a ... |
November 11, 2022 |
