Symptoms of P0696
- Check-engine light, sometimes with several unrelated codes at once.
- Warning lights, a no-start, or intermittent electrical faults.
- Communication or module-reset problems on a scan tool.
Common causes of P0696
- Low battery voltage, poor grounds, corroded connectors, or blown fuses.
- Wiring or network (CAN bus) faults between modules.
- A module software/programming issue, or rarely a failed controller.
Useful checks before replacing parts
- Review fan 3 command, control voltage, relay state, fan module feedback, coolant temperature, A/C request, charging voltage, and freeze-frame data.
- Inspect for short-to-voltage faults, stuck relays, open grounds, melted connectors, damaged fan module wiring, and backfeed from prior repairs.
- Verify whether fan 3 or the related speed stage remains energized when not commanded and isolate relay, module, and harness branches.
Related OBD-II codes
These nearby computer entries can help compare wording and pin down the fault area.