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P140D Chevrolet Code - Exhaust Gas Recirculation Motor Control Circuit 2 Low Voltage

Quick Answer

The P140D Chevrolet code indicates a problem with the Exhaust Gas Recirculation (EGR) Motor Control Circuit 2, specifically detecting low voltage. Common causes include Faulty EGR Valve: A malfunctioning EGR valve can lead to low voltage in the motor control circuit, Wiring or Connector Damage: Corrosion, breaks, or loose connections in the wiring or connectors associated with the EGR system can cause voltage issues, EGR Motor Malfunction: A defective EGR motor can fail to regulate the exhaust gas flow properly, resulting in low voltage. 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
P140D Chevrolet indicates Exhaust Gas Recirculation Motor Control Circuit 2 Low Voltage.
Common causes
Common causes include Faulty EGR Valve: A malfunctioning EGR valve can lead to low voltage in the motor control circuit, Wiring or Connector Damage: Corrosion, breaks, or loose connections in the wiring or connectors associated with the EGR system can cause voltage issues, EGR Motor Malfunction: A defective EGR motor can fail to regulate the exhaust gas flow properly, resulting in low voltage.
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 10, 2024
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Code P140D Chevrolet Description

The P140D Chevrolet code indicates a problem with the Exhaust Gas Recirculation (EGR) Motor Control Circuit 2, specifically detecting low voltage. The EGR system plays a critical role in reducing emissions and improving fuel efficiency by recirculating a portion of exhaust gases back into the engine intake. The EGR motor control circuit is responsible for regulating the flow of exhaust gases into the intake manifold.

OBDII Code P140D Chevrolet - Exhaust Gas Recirculation Motor Control Circuit 2 Low Voltage
P140D Chevrolet Code - Exhaust Gas Recirculation Motor Control Circuit 2 Low Voltage

Common Causes of P140D Chevrolet

  1. Faulty EGR Valve: A malfunctioning EGR valve can lead to low voltage in the motor control circuit.
  2. Wiring or Connector Damage: Corrosion, breaks, or loose connections in the wiring or connectors associated with the EGR system can cause voltage issues.
  3. EGR Motor Malfunction: A defective EGR motor can fail to regulate the exhaust gas flow properly, resulting in low voltage.
  4. ECM Issues: Problems with the engine control module, such as software glitches or hardware failures, can also trigger the P140D code.

Symptoms of P140D Chevrolet

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the Check Engine Light on the dashboard.
  2. Reduced Engine Performance: The vehicle may experience a decrease in power and acceleration due to improper EGR system operation.
  3. Rough Idle: A rough or unstable idle may occur as a result of the EGR motor control circuit issue.
  4. Increased Emissions: The vehicle may fail emissions tests or emit higher levels of pollutants due to the malfunctioning EGR system.
  5. Engine Stalling: In severe cases, the engine may stall or hesitate during acceleration, indicating a more significant problem with the EGR system.

How to Fix P140D Chevrolet

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the trouble code and perform a thorough inspection of the EGR system components.
  2. Test EGR Valve: Check the EGR valve for proper operation, vacuum leaks, and carbon buildup. Replace if necessary.
  3. Inspect Wiring and Connectors: Examine the wiring harness and connectors for damage, corrosion, or loose connections. Repair or replace as needed.
  4. Test EGR Motor: Verify the functionality of the EGR motor by testing its operation and voltage output. Replace if it fails to meet specifications.
  5. Clear Codes and Test Drive: After completing the repairs, clear the trouble codes from the ECM and take the vehicle for a test drive to ensure the issue has been resolved.

Cost to Fix P140D Chevrolet

The cost of repairing a P140D Chevrolet code can vary depending on the specific cause of the issue and the labor rates in your area. Generally, replacing an EGR valve can range from $150 to $400, while fixing wiring or connectors may cost around $100 to $200. Replacing an EGR motor can cost between $200 and $500. Labor costs typically range from $80 to $150 per hour, with the total repair cost estimated to be between $300 and $800. It's advisable to contact local auto repair shops for accurate pricing based on your vehicle's make and model.

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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 P140D Chevrolet Code

1. What are common symptoms of OBDII code P140D in a Chevrolet related to the Exhaust Gas Recirculation (EGR) motor control circuit 2 low voltage issue?

- Common symptoms include engine hesitation, rough idling, decreased fuel efficiency, and potential stalling.

2. What are the possible causes of OBDII code P140D in a Chevrolet indicating low voltage in the EGR motor control circuit 2?

- Potential causes include a faulty EGR motor, damaged wiring or connectors in the circuit, a defective EGR valve, or issues with the EGR control module.

3. How can I diagnose the source of the low voltage issue in the EGR motor control circuit 2 triggering OBDII code P140D on a Chevrolet?

- Use a multimeter to test the voltage at different points in the circuit, inspect the wiring and connectors for damage, and perform a thorough visual inspection of the EGR components.

4. Can a dirty or clogged EGR valve contribute to the occurrence of OBDII code P140D in a Chevrolet due to low voltage in the EGR motor control circuit 2?

- Yes, a dirty or clogged EGR valve can disrupt the functioning of the EGR system, leading to voltage irregularities and triggering the P140D code.

5. What are some possible repair tips for addressing OBDII code P140D on a Chevrolet related to low voltage in the EGR motor control circuit 2?

- Clean or replace the EGR valve, repair any damaged wiring or connectors, reset the fault codes after repairs, and perform a thorough test drive to verify the issue is resolved.

6. Is it safe to continue driving a Chevrolet with an active OBDII code P140D indicating low voltage in the EGR motor control circuit 2?

- It is recommended to address the issue promptly to prevent potential engine performance issues or further damage to the EGR system. Continued driving with the code present may lead to worsened symptoms.

7. Can a malfunctioning EGR control module cause the EGR motor control circuit 2 to experience low voltage and trigger OBDII code P140D in a Chevrolet?

- Yes, a faulty EGR control module can disrupt the voltage supply to the EGR motor, leading to the code P140D being stored in the vehicle's computer system.

8. Are there any specific EGR system maintenance practices that can help prevent the recurrence of OBDII code P140D in a Chevrolet?

- Regularly cleaning the EGR valve, inspecting the wiring for signs of wear, and ensuring proper electrical connections can help maintain the health of the EGR system and prevent issues like low voltage in circuit 2.

9. How critical is it to address OBDII code P140D related to low voltage in the EGR motor control circuit 2 on a Chevrolet promptly?

- Addressing the issue promptly is important to prevent potential engine performance issues, decreased fuel efficiency, and emissions problems associated with a malfunctioning EGR system.

10. Can resetting the fault codes using an OBDII scanner temporarily clear OBDII code P140D in a Chevrolet, or is it necessary to diagnose and repair the underlying issue?

- While resetting the fault codes may temporarily clear the code, it is crucial to diagnose and repair the root cause of the low voltage in the EGR motor control circuit 2 to prevent the code from reoccurring.

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