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P1402 Chevrolet Code - Exhaust Gas Recirculation Supply Circuit

Quick Answer

The P1402 code for Chevrolet vehicles indicates a problem with the Exhaust Gas Recirculation (EGR) supply circuit. Common causes include Faulty EGR Valve: The EGR valve may become stuck open or closed, preventing proper operation of the EGR system, Damaged Wiring: Corrosion, fraying, or short circuits in the wiring harness can disrupt the electrical signal to the EGR valve or sensor, Malfunctioning EGR Sensor: A faulty EGR sensor can provide incorrect feedback to the ECM, leading to improper EGR system operation. 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
P1402 Chevrolet indicates Exhaust Gas Recirculation Supply Circuit.
Common causes
Common causes include Faulty EGR Valve: The EGR valve may become stuck open or closed, preventing proper operation of the EGR system, Damaged Wiring: Corrosion, fraying, or short circuits in the wiring harness can disrupt the electrical signal to the EGR valve or sensor, Malfunctioning EGR Sensor: A faulty EGR sensor can provide incorrect feedback to the ECM, leading to improper EGR system operation.
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 08, 2024
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Code P1402 Chevrolet Description

The P1402 code for Chevrolet vehicles indicates a problem with the Exhaust Gas Recirculation (EGR) supply circuit. The EGR system is responsible for reducing nitrogen oxide emissions by recirculating a portion of the engine's exhaust gases back into the combustion chamber. This process helps lower combustion temperatures and reduces the formation of harmful emissions.

OBDII Code P1402 Chevrolet - Exhaust Gas Recirculation Supply Circuit
P1402 Chevrolet Code - Exhaust Gas Recirculation Supply Circuit

Common Causes of P1402 Chevrolet

  1. Faulty EGR Valve: The EGR valve may become stuck open or closed, preventing proper operation of the EGR system.
  2. Damaged Wiring: Corrosion, fraying, or short circuits in the wiring harness can disrupt the electrical signal to the EGR valve or sensor.
  3. Malfunctioning EGR Sensor: A faulty EGR sensor can provide incorrect feedback to the ECM, leading to improper EGR system operation.
  4. ECM Issue: A problem with the engine control module (ECM) can prevent the EGR system from functioning correctly, triggering the P1402 code.
  5. Carbon Buildup: Accumulation of carbon deposits in the EGR system components can obstruct flow and cause malfunctions.

Symptoms of P1402 Chevrolet

  1. Check Engine Light: The most common symptom associated with the P1402 code is the illumination of the Check Engine Light on the vehicle's dashboard.
  2. Rough Idle: The engine may exhibit rough idling or misfiring when the EGR system is not functioning properly.
  3. Reduced Fuel Economy: A malfunctioning EGR supply circuit can lead to decreased fuel efficiency due to inefficient combustion.
  4. Engine Stalling: In severe cases, the engine may stall or hesitate during acceleration, especially at low speeds.
  5. Increased Emissions: Failure of the EGR system can result in higher emissions output, potentially causing the vehicle to fail emissions tests.

How to Fix P1402 Chevrolet

  1. Diagnostic Scan: Use an OBD-II scanner to retrieve the specific fault code and identify the source of the issue.
  2. Inspect EGR System: Check the EGR valve, sensor, and associated wiring for any signs of damage or malfunction.
  3. Replace Faulty Components: Replace the EGR valve, sensor, or wiring harness as needed to restore proper operation of the EGR system.
  4. Clear Codes: After repairing the issue, clear the diagnostic trouble codes (DTCs) from the ECM memory using the OBD-II scanner.
  5. Test Drive: Take the vehicle for a test drive to ensure that the issue has been resolved and that the Check Engine Light does not reappear.

Cost to Fix P1402 Chevrolet

The cost of repairing a P1402 code on a Chevrolet vehicle can vary depending on the specific cause of the issue and the labor rates at the repair shop. In general, the parts needed for this repair, such as a new EGR valve or sensor, may range from $100 to $300. Labor costs can add another $100 to $200, bringing the total repair cost to approximately $200 to $500.

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Information for Specific Chevrolet Models

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 P1402 Chevrolet Code

1. What are the common symptoms of OBDII code P1402 (Chevrolet) related to the Exhaust Gas Recirculation (EGR) supply circuit?

The common symptoms include rough idling, engine stalling, decreased fuel efficiency, and an illuminated Check Engine Light.

2. What are the typical causes of OBDII code P1402 (Chevrolet) indicating an issue with the EGR supply circuit?

Common causes include a faulty EGR valve, clogged EGR passages, damaged wiring or connectors in the EGR system, or a malfunctioning EGR vacuum regulator solenoid.

3. How can I diagnose the OBDII code P1402 (Chevrolet) related to the EGR supply circuit issue?

Diagnosis involves using a scan tool to retrieve the error code, inspecting the EGR valve and related components for damage or blockages, testing the EGR vacuum regulator solenoid, and checking the wiring for any faults.

4. What are some repair tips for fixing OBDII code P1402 (Chevrolet) associated with the EGR supply circuit problem?

Repair tips may include cleaning or replacing the EGR valve, clearing any clogs in the EGR passages, repairing or replacing damaged wiring or connectors, and testing or replacing the EGR vacuum regulator solenoid.

5. Can driving with OBDII code P1402 (Chevrolet) triggered by EGR supply circuit issues cause further damage to the vehicle?

Continuing to drive with this code may lead to poor engine performance, increased emissions, and potential damage to other components in the EGR system and engine, so it's advisable to address the issue promptly.

6. How important is it to address OBDII code P1402 (Chevrolet) linked to the EGR supply circuit malfunction?

Addressing this code is crucial as it can impact the vehicle's performance, fuel efficiency, and emissions compliance. Ignoring the issue may lead to more severe problems over time.

7. Are there any preventive measures to avoid encountering OBDII code P1402 (Chevrolet) due to EGR supply circuit issues?

Regular maintenance, such as cleaning the EGR system components, inspecting for any signs of wear or damage, and addressing any related warning lights promptly, can help prevent this code from appearing.

8. Can a DIY enthusiast with basic automotive knowledge fix OBDII code P1402 (Chevrolet) related to EGR supply circuit problems?

Depending on the specific issue, some DIY enthusiasts may be able to address this code by following repair guides, but more complex problems may require professional diagnosis and repair.

9. How long does it typically take to repair OBDII code P1402 (Chevrolet) associated with EGR supply circuit malfunctions?

The repair time can vary based on the exact cause of the issue, but it may take anywhere from an hour for simple fixes like cleaning components to several hours for more involved repairs or part replacements.

10. Is it recommended to reset the Check Engine Light after repairing OBDII code P1402 (Chevrolet) linked to EGR supply circuit problems?

Yes, it is advisable to clear the error code and reset the Check Engine Light after addressing the issue to ensure the repair was successful and to monitor if the code reappears.

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