DTC P0641 Hummer
5 V Reference 1 Circuit
5 V Reference 1 Circuit
Description
DTCs P0601, P0602, P0603, P0604, P0605, P0606, P0607, P060D, P062F and P2610 are not set. The ignition is in Unlock, Accessory, Run, or Crank. The ignition voltage is more than 5.23 V. DTCs P0641 and P0651 run continuously when the above conditions are met.
Cause and Solution
The ECM detects a voltage out of tolerance condition on the 5 V reference 1 or 2 bus for more than 0.5 s.
Video Guide
Diagnostic Info
- DTC Code: P0641
- Brand: Hummer