P0692Fan 1 Control Circuit High
The control circuit for cooling fan 1 is reading higher voltage than expected, typically from an open circuit or a short to battery voltage.
Definition
The PCM drives cooling fan 1 through a relay or fan control module and monitors the control line for the correct voltage in each commanded state. P0692 sets when the circuit reads high when it should be pulled low — usually an open circuit, a failed relay coil, or a short to battery voltage. The fan typically fails to run (or runs continuously if shorted to power), risking engine overheating in slow traffic and weak A/C performance, along with an illuminated MIL.
Common causes
- Open in the fan control wiring between the PCM and relay or fan module
- Open fan relay coil or corroded relay socket terminals
- Control wire shorted to battery voltage
- Corroded or backed-out terminal at the fan or relay connector
- Failed fan control module
- Faulty PCM driver
Common misdiagnoses
- Cooling fan motor replaced when the control circuit is open upstream
- Water pump or thermostat replaced for the overheating symptom
- PCM replaced without load-testing the control circuit
Troubleshooting steps
1.Command fan 1 with a scan tool
Confirm the fan does not respond and note whether the code sets immediately with the output commanded on.
2.Check circuit continuity end to end
With the harness disconnected, the control wire from PCM to relay/module should read under about 1 ohm; an open points to a broken wire or terminal.
3.Inspect the relay and its socket
Measure the relay coil (roughly 50–120 ohms) and look for corroded, spread, or backed-out terminals in the socket.
4.Test for short to voltage
With the circuit commanded low, a reading stuck at battery voltage that persists with the relay removed indicates a short to power in the harness.
5.Verify power and ground at the fan assembly
Confirm the fan itself runs when powered directly before replacing any control components.