P0692 indicates that the powertrain control module (PCM) has detected a high voltage condition in the control circuit for cooling fan 1. This typically means the circuit is shorted to battery voltage or a component is failing, not that the PCM itself is faulty.
A wire in the fan control circuit has rubbed through and is contacting a 12V source, causing the high voltage reading.
A relay that fails in the closed position or has an internal short can supply constant voltage to the fan control circuit.
An internal short in the fan motor can backfeed voltage into the control circuit, triggering the high voltage code.
Moisture or corrosion in the electrical connectors can create unintended paths for voltage.
In very rare cases, a failed driver transistor inside the PCM can cause a high voltage condition, but this is the least likely cause and should only be considered after all other possibilities are ruled out.
Replacing the PCM is almost never the correct fix for P0692. The code means the PCM detected a high voltage in the fan control circuit, which is usually caused by a shorted wire, bad relay, or faulty fan motor. Replacing the PCM without addressing the underlying circuit problem will not fix the issue and may damage the new PCM.
Yes, a relay that is stuck closed or has an internal short to the coil supply can cause a high voltage condition on the control circuit, triggering P0692. This is one of the most common causes.
It depends. If the fan runs continuously, the engine may not overheat but the fan motor or relay could fail completely. If the fan does not run, the engine can overheat quickly, especially in stop-and-go traffic. It is best to diagnose and repair the issue promptly.
A basic OBD-II scanner can read the code, but a more advanced scan tool that can command the fan on/off and view live data is very helpful for diagnosis. However, you can still test the relay and wiring with a multimeter.