Useful checks before replacing parts
- Review fan 1 command, feedback voltage, relay state, fan module data, coolant temperature, A/C request, freeze-frame data, and charging voltage.
- Inspect for short-to-voltage faults, stuck fan relays, open grounds, melted connector terminals, fan module failure, and backfeed from repaired wiring.
- Verify whether fan 1 remains energized or the control circuit stays high when the PCM is not commanding fan operation.
Related OBD-II codes
These nearby computer entries can help compare wording and fault area. They may share the same verification status as the source database.