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Code

P0691

Cooling

Cooling fan relay 1 control circuit low

The cooling fan relay 1 circuit reads too low.

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Most likely causes

Shorted relay circuit
Faulty relay
Wiring short

Symptoms you may notice

Fan runs constantly or never
Overheating in traffic

Checks to run

Test the relay
Check wiring
Verify fan operation

Tools you may need

Multimeter

Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.

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Coolant thermostat below regulating temperature

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Cooling fan relay 1 control circuit malfunction

Engine coolant temperature sensor circuit low input

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