What this code means

The PCM has detected a malfunction in the high-speed cooling fan relay control circuit. The relay that activates the cooling fan at high speed is not responding to PCM commands.

Symptoms

• Check Engine Light
• Engine overheating at idle or in traffic
• A/C performance reduced
• Cooling fan does not run at high speed

Common causes

• Faulty high-speed fan relay
• Wiring open or short in relay circuit
• Corroded relay socket
• Faulty cooling fan motor
• PCM driver failure

Diagnostic steps

1. Swap high-speed fan relay with a known good relay
2. Check relay socket for power, ground, and PCM control
3. Test cooling fan motor directly with battery power
4. Inspect relay circuit wiring
5. Check PCM output to relay

Repair notes

Replace the high-speed fan relay if faulty; test the fan motor and repair wiring as needed.

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