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Engine-Codes – Generic – P0490

P0490 Code - Exhaust Gas Recirculation Motor Control Circuit High Voltage

Quick Answer

The P0490 code indicates a problem with the Exhaust Gas Recirculation (EGR) motor control circuit, specifically detecting high voltage. Common causes include Damaged wiring or connectors in the EGR motor control circuit, Faulty EGR valve, Malfunctioning EGR position sensor. 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
P0490 indicates Exhaust Gas Recirculation Motor Control Circuit High Voltage.
Common causes
Common causes include Damaged wiring or connectors in the EGR motor control circuit, Faulty EGR valve, Malfunctioning EGR position sensor.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 14, 2024
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Code P0490 Description

The P0490 code indicates a problem with the Exhaust Gas Recirculation (EGR) motor control circuit, specifically detecting high voltage. The EGR system is responsible for recirculating a portion of the exhaust gases back into the engine cylinders to reduce combustion temperatures and lower harmful emissions. The EGR motor control circuit is essential for regulating the EGR valve's operation, which controls the flow of exhaust gases into the intake manifold.

OBDII Code P0490 - Exhaust Gas Recirculation Motor Control Circuit High Voltage
P0490 Code - Exhaust Gas Recirculation Motor Control Circuit High Voltage

Common Causes of P0490

  1. Damaged wiring or connectors in the EGR motor control circuit
  2. Faulty EGR valve
  3. Malfunctioning EGR position sensor
  4. Issues with the engine control module (ECM)
  5. Carbon buildup in the EGR system

Symptoms of P0490

  1. Decreased fuel efficiency
  2. Rough idling or engine vibrations
  3. Engine misfires
  4. Stalling or hesitation during acceleration
  5. Illumination of the check engine light

How to Fix P0490

  1. Begin by conducting a visual inspection of the EGR motor control circuit, checking for any damaged wiring or connectors. Repair or replace any faulty components as needed.
  2. Test the EGR valve and EGR position sensor using a multimeter to ensure they are functioning correctly. Replace any components that are not within the specified parameters.
  3. Check the engine control module (ECM) for any error codes related to the EGR system and address any issues accordingly.
  4. Clean the EGR system to remove any carbon buildup that may be affecting its operation.
  5. Clear the diagnostic trouble codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0490

The typical repair costs for addressing a P0490 code can vary depending on the specific cause of the issue. In general, the cost of parts for this repair can range from $100 to $500, with labor costs adding an additional $100 to $300. It's important to note that diagnostic time and labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. Factors such as location, vehicle make and model, and engine type can also impact the overall repair costs. For a more accurate estimate, it is recommended to consult with a local auto repair shop.

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Code P0490 Information for Specific Makes

  • P0490 Audi — Exhaust Gas Recirculation Throttle Control Circuit 'A' Circuit High
  • P0490 Buick — Exhaust Gas Recirculation Motor Control Circuit High Voltage
  • P0490 Cadillac — Exhaust Gas Recirculation Motor Control Circuit High Voltage
  • P0490 Chevrolet — Exhaust Gas Recirculation Motor Control Circuit High Voltage
  • P0490 Chrysler — Exhaust Gas Recirculation Throttle Control Circuit 'A' Circuit High
  • P0490 Dodge — Exhaust Gas Recirculation Throttle Control Circuit 'A' Circuit High
  • P0490 Ford — Exhaust Gas Recirculation Motor Control Circuit High Voltage
  • P0490 GMC — Exhaust Gas Recirculation Motor Control Circuit High Voltage
  • P0490 Jeep — Exhaust Gas Recirculation Throttle Control Circuit 'A' Circuit High
  • P0490 KIA — Exhaust Gas Recirculation Throttle Control Circuit 'A' Circuit High
  • P0490 Lincoln — Exhaust Gas Recirculation Motor Control Circuit High Voltage
  • P0490 Mercury — Exhaust Gas Recirculation Motor Control Circuit High Voltage
  • P0490 Mitsubishi — Exhaust Gas Recirculation Throttle Control Circuit 'A' Circuit High
  • P0490 Volkswagen — Exhaust Gas Recirculation Throttle Control Circuit 'A' Circuit High
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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