Engine-CodesJeep – P1490 Jeep

P1490 Jeep Code - Low Speed Radiator Fan Control Relay Condition

Quick Answer

The P1490 code for Jeep vehicles indicates a problem with the Low Speed Radiator Fan Control Relay Condition. Common causes include Faulty low-speed radiator fan control relay, Damaged wiring or connectors in the relay circuit, Malfunctioning radiator fan motor. 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
P1490 Jeep indicates Low Speed Radiator Fan Control Relay Condition.
Common causes
Common causes include Faulty low-speed radiator fan control relay, Damaged wiring or connectors in the relay circuit, Malfunctioning radiator fan motor.
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.
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code P1490 Jeep Description

The P1490 code for Jeep vehicles indicates a problem with the Low Speed Radiator Fan Control Relay Condition. Essentially, this means that there is an issue with the relay that controls the low-speed operation of the radiator fan. The radiator fan is crucial for regulating the temperature of the engine by cooling the radiator, so any malfunction in this system can lead to overheating and potential engine damage.

OBDII Code P1490 Jeep - Low Speed Radiator Fan Control Relay Condition
P1490 Jeep Code - Low Speed Radiator Fan Control Relay Condition

Common Causes of P1490 Jeep

  1. Faulty low-speed radiator fan control relay
  2. Damaged wiring or connectors in the relay circuit
  3. Malfunctioning radiator fan motor
  4. ECM software issues
  5. Overheating conditions causing relay failure

Symptoms of P1490 Jeep

  1. Engine overheating
  2. Poor fuel efficiency
  3. Air conditioning not cooling effectively
  4. Radiator fan not turning on
  5. Check Engine Light illuminated

How to Fix P1490 Jeep

  1. Begin by conducting a visual inspection of the relay, wiring, and radiator fan for any visible damage.
  2. Test the relay using a multimeter to check for proper voltage and resistance.
  3. Check the wiring and connectors for any signs of corrosion or damage and repair or replace as necessary.
  4. If the relay is faulty, replace it with a new one following the manufacturer's recommendations.
  5. Clear the fault codes and test the vehicle to ensure the issue has been resolved.

Cost to Fix P1490 Jeep

The cost of repairing a P1490 code related to the low-speed radiator fan control relay condition can vary depending on the root cause of the issue. In general, the cost of a new relay can range from $50 to $150, while labor costs can range from $100 to $200. Overall, the total repair cost can be estimated to be between $150 and $350. It's important to note that these costs are approximate and can vary based on the factors mentioned earlier.

When is the Code Detected?

The Powertrain Control Module (PCM) has detected an open or shorted condition in the radiator fan relay circuit

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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