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P0691 - Cooling Fan 1 Relay Control Circuit Low

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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)
Help with this
- 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
P0691 Information for specific makes
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