[SOLVED] Dodge P1491 Code: Quick Fix For Radiator Fan Relay

The OBD code P1491 for Dodge indicates an issue with the Radiator Fan Control Relay Circuit.

Symptoms include the Engine Light being ON.

The main cause is a faulty Radiator Fan Control Relay or related wiring issues.

This problem is not extremely serious but can lead to overheating if not addressed.

To fix it, inspect the relay, wiring harness, and connectors for any damage or poor connections.

Repair Importance Level	10.0 (Out of 10)
Estimated Repair Time	Approximately 1.0 hour
Repair Difficulty Level	10.0 (Out of 10)

Symptoms of the Dodge p1491 OBD Code

The Dodge P1491 fault code typically triggers the check engine light due to an issue with the cooling system.

Symptoms: Engine Light ON.
Possible rough idle.
Possible stalling at idle.
Possible decrease in engine performance.

Causes of the Dodge p1491 OBD Code

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The fault code P1491 on a Dodge typically indicates an issue with the radiator fan control circuit.

P1491 can be caused by a faulty Radiator Fan Control Relay.
A Radiator Fan Control Relay harness that is open or shorted.
A Radiator Fan Control Relay circuit with poor electrical connection.
A faulty Radiator Fan.

Fixing Dodge Error Code p1491 Step By Step

Replace the leak detection pump solenoid to address Dodge fault code p1491.

To fix the Dodge OBDII code p1491, start by reviewing the possible causes mentioned above.
Visually examine the wiring harness and connectors related to the evaporative emission system.
Check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
Next, check the operation of the Leak Detection Pump (LDP) and the LDP pressure switch.
Test the LDP and pressure switch for proper functionality.
Replace the LDP or pressure switch if they are faulty.
Clear the fault codes from the vehicle’s computer using a scan tool.
Finally, perform a test drive to ensure the code does not return, indicating a successful repair.

Cost Of Fixing Dodge p1491 Fault Code

Diagnosing and repairing Dodge fault code p1491 may involve testing and replacing the leak detection pump.

The cost to diagnose and fix the Dodge OBD code P1491 typically ranges from $75 to $150 for labor rates per hour.

With an estimated repair time of 1. 0 hour, the total cost could be around $75 to $150, depending on shop rates and the complexity of the repair.

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Details of the Dodge p1491 OBD Code

Dodge fault code p1491 relates to the secondary air injection system.

Dodge OBD code P1491 means the Radiator Fan Control Relay Circuit is malfunctioning.

This code is triggered by the Engine Control Module (ECM) when it detects an issue with the radiator fan relay circuit.

The ECM monitors the signal from the relay to control the operation of the radiator fan.

If the circuit has a fault, the ECM will set this diagnostic trouble code (DTC) P1491.

Mechanic’s Tech Notes

Detailed information on Dodge fault code p1491, including symptoms, causes, and solutions for effective troubleshooting.

To diagnose and fix OBDII code P1491 in a Dodge, start by checking the transmission control module (TCM) power and ground using a multimeter.

Use a scan tool to confirm TCM communication over the Controller Area Network (CAN) network.

If communication issues persist, consider reprogramming or reflashing the TCM.

Visually inspect the wiring harness and connectors for any damage, focusing on broken, bent, or corroded pins.

Ensure all connections are secure.

If the issue persists, consider replacing the TCM.

FAQ

1. What are the common symptoms associated with OBD code P1491 in a Dodge vehicle?

Common symptoms of OBD code P1491 in a Dodge vehicle include Engine Light ON, caused by faulty Radiator Fan Control Relay or related wiring issues. Fix: Inspect and repair as needed.

2. What is the typical cause of OBD code P1491 in Dodge vehicles?

The typical cause of OBD code P1491 in Dodge vehicles is a faulty Radiator Fan Control Relay or related wiring issues. Inspect and repair as needed.

3. How can I diagnose and fix OBD code P1491 in my Dodge vehicle?

Diagnose and fix OBD code P1491 in your Dodge by checking the radiator fan control relay, harness, and connections for faults. Repair or replace damaged components as needed.

Wrap Up

If your Dodge is displaying OBD code P1491, you may experience issues with the secondary air injection system.

This could be caused by a faulty secondary air injection pump, a blocked or leaking air supply hose, or a malfunctioning secondary air injection solenoid.

To address Dodge OBD code P1491, check the secondary air injection pump for proper operation, inspect the air supply hose for any blockages or leaks, and test the secondary air injection solenoid for functionality.

Ensure all related wiring and connectors are secure and free of damage.