Engine Fan Control Circuit High
The engine fan control circuit is detecting a high voltage condition.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The engine fan is controlled by a circuit that’s detecting too much voltage, which usually means there's a problem with the wiring, connectors or the fan motor itself.
What the computer is actually seeing
The engine control module (ECM) sees the fan control circuit voltage above the normal threshold, typically over 5 volts when it should be around 0-2 volts when the fan is off, signaling a fault in the circuit.
What a healthy reading looks like
Normal operation should show 0-2 volts when the fan is off and around 12-14 volts when the fan is actively powered.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Inspect the wiring and connectors for damage or corrosion. Check for any shorts or breaks in the wires.
- 22. Use a multimeter to test the voltage at the fan control circuit connection when the fan should be off; it should read between 0-2 volts.
- 33. If voltage is high (above 5 volts), check the fan motor for shorts to ground.
- 44. If the fan motor is okay, check the ECM output signal at the connector; it should vary correctly when commanded to turn on/off.
- 55. Replace any damaged components based on your findings.
Common causes
- Damaged wiring in the fan control circuit
- Corroded or loose connectors
- Faulty fan motor causing a short
- Improperly functioning ECM sending incorrect signals
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended as overheating can occur if the fan isn't operating correctly.
Will the code come back after clearing?
If the underlying issue isn't fixed, the code will likely return.
Why does this code appear with other codes?
Multiple codes can indicate a systemic issue in the fan control and ECM communication.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →