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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

  1. Shorted relay circuit
  2. Faulty relay
  3. Wiring short

Symptoms you may notice

  • Fan runs constantly or never
  • Overheating in traffic

Checks to run

  1. Test the relay
  2. Check wiring
  3. Verify fan operation

Tools you may need

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

Related codes in Cooling

P0128

Coolant thermostat below regulating temperature

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Engine coolant temperature sensor circuit malfunction

 P0125

Insufficient coolant temperature for closed-loop fuel control

 P0480

Cooling fan relay 1 control circuit malfunction

 P0117

Engine coolant temperature sensor circuit low input
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