P1491 RAM Code - Radiator Fan Relay Circuit Condition
Quick Answer
With the key on or engine running, system voltage over 10v, fan relay commanded on, the Powertrain Control Module (PCM) sets the Diagnostic Trouble Code (DTC) when it detects a shorted or open condition in the relay control circuit. Common causes include Faulty Radiator Fan Control Relay, Radiator Fan Control Relay harness is open or shorted, Radiator Fan Control Relay circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1491 RAM indicates Radiator Fan Relay Circuit Condition.
- Common causes
- Common causes include Faulty Radiator Fan Control Relay, Radiator Fan Control Relay harness is open or shorted, Radiator Fan Control Relay circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1491 RAM Description
What are the Possible Causes of the DTC P1491 RAM?
- Faulty Radiator Fan Control Relay
- Radiator Fan Control Relay harness is open or shorted
- Radiator Fan Control Relay circuit poor electrical connection
- Faulty Radiator Fan
How to Fix the DTC P1491 RAM?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1491 RAM code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P1491 RAM Code
1. What are the common symptoms of OBDII code P1491 related to the Radiator Fan Relay Circuit Condition?
The common symptoms include the engine overheating, the radiator fan not working properly, and the Check Engine light being illuminated.
2. What are the possible causes of OBDII code P1491 for the Radiator Fan Relay Circuit Condition?
Possible causes include a faulty radiator fan relay, a malfunctioning coolant temperature sensor, a damaged fan motor, or wiring issues in the circuit.
3. How can I diagnose the source of OBDII code P1491 for the Radiator Fan Relay Circuit Condition?
You can use a multimeter to test the radiator fan relay, coolant temperature sensor, and fan motor for proper functionality. Inspecting the wiring for any signs of damage or corrosion is also recommended.
4. What are some repair tips for addressing OBDII code P1491 related to the Radiator Fan Relay Circuit Condition?
Ensure all electrical connections are secure and free of corrosion. Replace any faulty components such as the radiator fan relay, coolant temperature sensor, or fan motor as needed. Clear the trouble code after completing repairs.
5. Can driving with OBDII code P1491 related to the Radiator Fan Relay Circuit Condition cause further damage to my vehicle?
Continuing to drive with this code can lead to engine overheating, potential damage to the radiator, and other cooling system components. It is recommended to address the issue promptly to prevent costly repairs.
6. Is it safe to reset the Check Engine light after repairing OBDII code P1491 for the Radiator Fan Relay Circuit Condition?
Yes, once the underlying issue has been resolved and necessary repairs have been made, it is safe to reset the Check Engine light using an OBDII scanner.
7. Will disconnecting the battery reset OBDII code P1491 related to the Radiator Fan Relay Circuit Condition?
Disconnecting the battery may clear the code temporarily, but it is not a permanent solution. It is essential to address the root cause of the code to prevent it from reoccurring.
8. How important is it to fix OBDII code P1491 for the Radiator Fan Relay Circuit Condition promptly?
It is crucial to address this code promptly to prevent engine overheating, potential damage to the cooling system, and costly repairs in the future. Ignoring the issue can lead to further complications.
9. Can extreme weather conditions impact the occurrence of OBDII code P1491 related to the Radiator Fan Relay Circuit Condition?
Extreme heat or cold can put additional stress on the cooling system components, potentially leading to issues with the radiator fan relay circuit. It is important to monitor the system during such conditions.
10. Are there any preventative maintenance steps I can take to avoid OBDII code P1491 for the Radiator Fan Relay Circuit Condition?
Regularly inspecting the cooling system components, ensuring proper coolant levels, and addressing any issues promptly can help prevent the occurrence of this trouble code. Regular maintenance is key to preventing problems.
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