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P0691 - Cooling Fan 1 Relay Control Circuit Low

Possible causes
- Faulty Low Speed Radiator Fan Relay
- Low Speed Radiator Fan Relay harness is open or shorted
- Low Speed Radiator Fan Relay circuit poor electrical connection
- Faulty Electric Fan
- Faulty Engine Control Module (ECM)
What does this mean? What does this mean?
- Engine Light ON (or Service Engine Soon Warning Light)
- Radiator fan inoperative
- Possible engine overheating
P0691 Description

The Engine Control Module (ECM) has detected a short to ground in the cooling fan relay 1 control circuit

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