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Engine-Codes – GMC – P1402 2018 GMC Sierra

P1402 2018 GMC Sierra Code - Exhaust Gas Recirculation Supply Circuit

Quick Answer

The P1402 code on a 2018 GMC Sierra indicates a problem with the Exhaust Gas Recirculation (EGR) supply circuit. Common causes include Faulty EGR valve, Clogged EGR passages, Wiring or connector issues in the EGR circuit. 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 2018 GMC Sierra indicates Exhaust Gas Recirculation Supply Circuit.
Common causes
Common causes include Faulty EGR valve, Clogged EGR passages, Wiring or connector issues in the EGR circuit.
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 P1402 2018 GMC Sierra Description

The P1402 code on a 2018 GMC Sierra 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 intake manifold. This helps lower combustion temperatures and reduce the formation of harmful emissions.

OBDII Code P1402 2018 GMC Sierra - Exhaust Gas Recirculation Supply Circuit
P1402 2018 GMC Sierra Code - Exhaust Gas Recirculation Supply Circuit

Common Causes of P1402 2018 GMC Sierra

  1. Faulty EGR valve
  2. Clogged EGR passages
  3. Wiring or connector issues in the EGR circuit
  4. Vacuum leaks in the EGR system
  5. Carbon buildup in the EGR system

Symptoms of P1402 2018 GMC Sierra

  1. Check Engine Light illuminated
  2. Reduced engine performance
  3. Rough idling or stalling
  4. Increased fuel consumption
  5. Failed emissions test

How to Fix P1402 2018 GMC Sierra

  1. Diagnose the EGR system using a scan tool to pinpoint the exact cause of the issue.
  2. Inspect the EGR valve for proper operation and replace if necessary.
  3. Clean out any carbon buildup in the EGR passages.
  4. Check and repair any wiring or connector issues in the EGR circuit.
  5. Test the EGR system after repairs to ensure proper functionality.

Cost to Fix P1402 2018 GMC Sierra

The cost of repairing a P1402 code on a 2018 GMC Sierra can vary depending on the specific cause of the issue and the labor rates in your area. On average, the repair costs for this type of problem can range from $200 to $500, including parts and labor. It's important to consult with a qualified mechanic or auto repair shop to get an accurate estimate based on your vehicle's specific needs and location. Labor rates typically range from $80 to $150 per hour, but can be higher in certain areas or at dealerships.

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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 P1402 2018 GMC Sierra Code

1. What does the OBDII code P1402 mean on a 2018 GMC Sierra?

P1402 indicates an issue with the Exhaust Gas Recirculation (EGR) supply circuit, often caused by a malfunction in the EGR system or its related components.

2. What are the symptoms of code P1402 in a 2018 GMC Sierra?

Common symptoms include poor engine performance, a rough idle, reduced fuel efficiency, and the Check Engine Light being illuminated.

3. What causes the P1402 code on a 2018 GMC Sierra?

Possible causes include a faulty EGR valve, clogged EGR passages, damaged wiring, a malfunctioning EGR temperature sensor, or a failed EGR control solenoid.

4. Can I drive my 2018 GMC Sierra with the P1402 code?

While the vehicle may still be drivable, prolonged operation with this code could lead to reduced performance and potential engine damage. It’s best to address the issue promptly.

5. How do I diagnose the P1402 code on a 2018 GMC Sierra?

Diagnosis typically involves scanning the vehicle with an OBDII scanner, inspecting the EGR valve and wiring, checking for carbon buildup in the EGR passages, and testing the EGR temperature sensor.

6. How do I fix the P1402 code on a 2018 GMC Sierra?

Repairs may include cleaning or replacing the EGR valve, clearing clogged EGR passages, repairing or replacing damaged wiring, or replacing the EGR temperature sensor.

7. How much does it cost to fix the P1402 code on a 2018 GMC Sierra?

The cost can vary depending on the specific issue. EGR valve replacements typically range from $150 to $400, while cleaning or minor wiring repairs may cost less.

8. Can a dirty EGR valve cause the P1402 code?

Yes, a dirty or clogged EGR valve is a common cause of the P1402 code, as it can restrict proper exhaust gas flow and trigger the fault.

9. How can I prevent the P1402 code on my 2018 GMC Sierra?

Regular maintenance, including cleaning the EGR system and using high-quality fuel, can help prevent carbon buildup and reduce the likelihood of EGR-related issues.

10. Will clearing the P1402 code fix the problem permanently?

Clearing the code will turn off the Check Engine Light temporarily, but if the underlying issue is not resolved, the code will likely return.

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