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P0490 2014 Chevrolet Silverado Code - Exhaust Gas Recirculation Motor Control Circuit High Voltage

Quick Answer

The P0490 code on a 2014 Chevrolet Silverado indicates a problem with the Exhaust Gas Recirculation (EGR) motor control circuit, specifically detecting high voltage. Common causes include Faulty EGR motor, Damaged wiring or connectors in the EGR motor control circuit, Malfunctioning engine control module (ECM). 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 2014 Chevrolet Silverado indicates Exhaust Gas Recirculation Motor Control Circuit High Voltage.
Common causes
Common causes include Faulty EGR motor, Damaged wiring or connectors in the EGR motor control circuit, Malfunctioning engine control module (ECM).
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 16, 2024
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Code P0490 2014 Chevrolet Silverado Description

The P0490 code on a 2014 Chevrolet Silverado 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 exhaust gases back into the engine's intake manifold to reduce emissions and improve fuel efficiency. The EGR motor control circuit regulates the operation of the EGR valve, controlling the flow of exhaust gases.

OBDII Code P0490 2014 Chevrolet Silverado - Exhaust Gas Recirculation Motor Control Circuit High Voltage
P0490 2014 Chevrolet Silverado Code - Exhaust Gas Recirculation Motor Control Circuit High Voltage

Common Causes of P0490 2014 Chevrolet Silverado

  1. Faulty EGR motor
  2. Damaged wiring or connectors in the EGR motor control circuit
  3. Malfunctioning engine control module (ECM)
  4. Carbon buildup in the EGR system
  5. Vacuum leaks in the EGR system

Symptoms of P0490 2014 Chevrolet Silverado

  1. Rough idling
  2. Decreased fuel efficiency
  3. Engine misfires
  4. Stalling

How to Fix P0490 2014 Chevrolet Silverado

  1. Begin by performing a visual inspection of the EGR motor, wiring, and connectors to check for any visible damage or loose connections.
  2. Use a multimeter to test the voltage levels in the EGR motor control circuit to determine if they are within the specified range.
  3. If the voltage levels are high, replace the EGR motor with a new one and ensure proper installation.
  4. Clear the diagnostic trouble codes from the vehicle's ECM using a scan tool and test drive the vehicle to verify that the issue has been resolved.
  5. If the problem persists, further diagnostic testing may be needed to identify any other underlying issues causing the high voltage in the EGR motor control circuit.

Cost to Fix P0490 2014 Chevrolet Silverado

The typical repair costs for addressing a P0490 code on a 2014 Chevrolet Silverado can range from $200 to $500, including parts and labor. However, it's important to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Auto repair shops commonly charge between $80 and $150 per hour for labor, with rates potentially higher in metropolitan areas or at dealerships, and lower at independent shops. It's recommended to check local rates for a more accurate estimate.

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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.

Frequently Asked Questions about P0490 2014 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P0490 in a 2014 Chevrolet Silverado?

The common symptoms of code P0490 include rough idling, decreased fuel efficiency, and the illumination of the check engine light.

2. What does the OBDII code P0490 indicate in a 2014 Chevrolet Silverado?

Code P0490 indicates a problem with the Exhaust Gas Recirculation (EGR) motor control circuit in a 2014 Chevrolet Silverado, specifically a high voltage condition.

3. What are the possible causes of OBDII code P0490 in a 2014 Chevrolet Silverado?

Possible causes of code P0490 in a 2014 Chevrolet Silverado include a faulty EGR motor, damaged wiring or connectors in the EGR circuit, or a problem with the EGR control module.

4. How can I diagnose the OBDII code P0490 in my 2014 Chevrolet Silverado?

Diagnosing code P0490 involves checking the EGR motor for proper operation, inspecting the wiring and connectors for any damage, and using a scan tool to monitor the EGR system's performance.

5. Can I drive my 2014 Chevrolet Silverado with OBDII code P0490?

It is not recommended to drive your vehicle with code P0490 present, as it can lead to reduced engine performance and potential damage to other components.

6. How serious is OBDII code P0490 in a 2014 Chevrolet Silverado?

Code P0490 should be addressed promptly to prevent further damage to the EGR system and ensure optimal engine performance in a 2014 Chevrolet Silverado.

7. How can I reset the check engine light after fixing OBDII code P0490 in my 2014 Chevrolet Silverado?

After fixing the issue causing code P0490, you can reset the check engine light using an OBDII scanner or disconnecting the battery for a few minutes.

8. Can a clogged EGR valve cause OBDII code P0490 in a 2014 Chevrolet Silverado?

While a clogged EGR valve can contribute to code P0490, the specific issue is related to the EGR motor control circuit experiencing high voltage.

9. Are there any DIY repair tips for addressing OBDII code P0490 in a 2014 Chevrolet Silverado?

DIY repair tips for code P0490 may include checking and cleaning the EGR motor and its connections, as well as ensuring the wiring harness is intact and free of damage.

10. Is it advisable to seek professional help for fixing OBDII code P0490 in a 2014 Chevrolet Silverado?

Given the complexity of diagnosing and repairing electrical issues like code P0490, it is advisable to seek professional help to accurately address and resolve the problem in a 2014 Chevrolet Silverado.

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