Driving a car with a Dodge Code P1491 can be a frustrating experience. The code is usually triggered when the car’s PCM detects an unexpected voltage condition on the Radiator Fan Control Relay circuit during the CCM test period. This can be caused by a variety of factors, including a faulty Radiator Fan Control Relay, a damaged PCM, or an open or shorted to ground Radiator Fan Control Relay circuit. Knowing the causes and solutions can help you diagnose and fix the issue quickly and easily.
Causes and Solutions for Dodge Code P1491
| Cause | Solution |
|---|---|
| Radiator fan control relay circuit is open or shorted to ground | Check the Radiator Fan Control Relay for any signs of damage and replace if necessary |
| Radiator fan control relay circuit is open (test power to IGN) | Check the wiring and connectors in the Radiator Fan Control Relay circuit for any signs of damage or corrosion |
| Radiator fan control relay is damaged or has failed | Replace the Radiator Fan Control Relay if it is damaged or has failed |
| PCM has failed | Replace the PCM if it has failed |
Faulty Radiator Fan Control Relay
If the Radiator Fan Control Relay is faulty, it can cause the Dodge Code P1491 to be triggered. To diagnose this issue, you should first check the Radiator Fan Control Relay for any signs of damage. If it is damaged, you should replace it.
Open or Shorted to Ground Radiator Fan Control Relay Circuit
If the Radiator Fan Control Relay circuit is open or shorted to ground, it can cause the Dodge Code P1491 to be triggered. To diagnose this issue, you should check the wiring and connectors in the Radiator Fan Control Relay circuit for any signs of damage or corrosion.
Damaged PCM
If the PCM is damaged, it can cause the Dodge Code P1491 to be triggered. To diagnose this issue, you should check the PCM for any signs of damage. If it is damaged, you should replace it.
Conclusion: Dodge Code P1491 Diagnosis and Repair Solutions
The Dodge Code P1491 can be an annoying issue to diagnose and repair. However, knowing the causes and solutions can help you quickly and easily diagnose and fix the issue. The causes and solutions include checking the Radiator Fan Control Relay for any signs of damage, checking the wiring and connectors in the Radiator Fan Control Relay circuit for any signs of damage or corrosion, and replacing the Radiator Fan Control Relay if it is damaged or has failed. If the PCM is damaged, it should also be replaced. By following these solutions, you can easily diagnose and repair Dodge Code P1491.
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