P1491moderate severityPowertrain
Radiator Fan Control Relay Circuit
on 2014 Chrysler 300 5.7L V8 Hemi · RWD
What this code means
The PCM has detected a malfunction in the radiator fan control relay circuit. This relay controls the main cooling fan operation and its failure can lead to engine overheating.
Symptoms
- Check Engine Light
- Engine overheating
- Cooling fan not operating
- A/C system poor performance
- Temperature gauge rising in traffic
Common causes
- Faulty radiator fan relay
- Corroded relay socket or connector
- Wiring damage in fan circuit
- Failed cooling fan motor
- PCM relay driver failure
Diagnostic steps
- Test radiator fan relay operation
- Apply direct power to fan motor to test
- Inspect relay socket and wiring
- Check PCM relay control signal
- Verify fan motor ground circuit
Repair notes
Replace the radiator fan relay and test the fan motor; repair wiring or replace fan motor if needed.
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