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P1339 2015 GMC Sierra Code - Cylinder 2 Glow Plug Offset Exceeded Learning Limit

Quick Answer

The diagnostic trouble code P1339 for a 2015 GMC Sierra indicates that the Engine Control Module (ECM) has detected that the offset for the glow plug in cylinder 2 has exceeded the learning limit. Common causes include Faulty glow plug in cylinder 2, Wiring issues such as a short or open circuit, Glow plug control module malfunction. 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
P1339 2015 GMC Sierra indicates Cylinder 2 Glow Plug Offset Exceeded Learning Limit.
Common causes
Common causes include Faulty glow plug in cylinder 2, Wiring issues such as a short or open circuit, Glow plug control module malfunction.
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 P1339 2015 GMC Sierra Description

The diagnostic trouble code P1339 for a 2015 GMC Sierra indicates that the Engine Control Module (ECM) has detected that the offset for the glow plug in cylinder 2 has exceeded the learning limit. Glow plugs are essential components in diesel engines that help with cold starts by heating the combustion chamber. When the offset exceeds the learning limit, it means that the ECM is unable to control the glow plug's operation effectively, which can lead to issues with starting the engine, reduced performance, and increased emissions.

OBDII Code P1339 2015 GMC Sierra - Cylinder 2 Glow Plug Offset Exceeded Learning Limit
P1339 2015 GMC Sierra Code - Cylinder 2 Glow Plug Offset Exceeded Learning Limit

Common Causes of P1339 2015 GMC Sierra

  1. Faulty glow plug in cylinder 2.
  2. Wiring issues such as a short or open circuit.
  3. Glow plug control module malfunction.
  4. ECM software glitch or malfunction.
  5. Poor quality fuel or contaminated fuel affecting glow plug performance.

Symptoms of P1339 2015 GMC Sierra

  1. Hard starting or difficulty starting the engine, especially in cold weather.
  2. Rough idling or engine vibrations.
  3. Misfires or hesitation during acceleration.
  4. Decreased fuel efficiency.
  5. Engine stalling or shutting off unexpectedly.

How to Fix P1339 2015 GMC Sierra

  1. Begin by diagnosing the specific cause of the issue using a scan tool to pinpoint the problem area.
  2. Inspect the glow plug in cylinder 2 for proper operation and replace if necessary.
  3. Check the wiring harness for any damage or corrosion, repairing or replacing as needed.
  4. Test the glow plug control module for functionality and replace if faulty.
  5. Clear the diagnostic trouble code from the ECM and perform a test drive to ensure the issue has been resolved.

Cost to Fix P1339 2015 GMC Sierra

The typical repair costs for addressing a P1339 code in a 2015 GMC Sierra can vary depending on the specific cause of the issue. Generally, replacing a glow plug can cost between $50 to $150 per plug, while diagnosing and repairing wiring or control module issues can range from $100 to $500 or more. Labor costs can add an additional $80 to $150 per hour, with total repair costs potentially ranging from $200 to $1000 or more. It is advisable to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on the specific circumstances of the vehicle. Labor rates can vary based on location, vehicle make and model, and the complexity of the repair.

What does this mean?

Tech Notes for P1339 2015 GMC Sierra

If a Glow Plug was replaced, perform a Glow Plug Learn procedure with a Scan Tool.

Need more information about the P1339 2015 GMC Sierra code?

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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 P1339 2015 GMC Sierra Code

1. What does the OBDII code P1339 mean on a 2015 GMC Sierra?

P1339 indicates that the Cylinder 2 Glow Plug Offset has exceeded the learning limit, suggesting an issue with the glow plug system in cylinder 2.

2. What are the common symptoms of code P1339 in a 2015 GMC Sierra?

Symptoms may include difficulty starting the engine, rough idling in cold weather, reduced engine performance, and the check engine light turning on.

3. What causes the P1339 code to trigger in a GMC Sierra?

Common causes include a faulty glow plug in cylinder 2, poor electrical connections, damaged wiring, or issues with the glow plug control module.

4. Can a bad glow plug in cylinder 2 cause other engine problems?

Yes, a faulty glow plug can lead to poor cold starts, misfires, and reduced fuel efficiency, particularly in colder climates.

5. How do you diagnose the P1339 code on a 2015 GMC Sierra?

Diagnosis typically involves scanning for codes, inspecting the glow plug and its wiring, testing the resistance of the glow plug, and checking the glow plug control module for faults.

6. Can you drive with the P1339 code on a 2015 GMC Sierra?

While the vehicle may still be drivable, ignoring this code can lead to starting issues and potentially cause further damage to the engine over time.

7. How do you fix the P1339 code in a GMC Sierra?

Repairs may include replacing the faulty glow plug in cylinder 2, repairing damaged wiring or connections, or replacing the glow plug control module if necessary.

8. How much does it cost to repair the P1339 code on a 2015 GMC Sierra?

The repair cost varies but typically ranges between $100 and $300, depending on whether you need to replace the glow plug or address other related issues.

9. Can a weak battery cause the P1339 code?

Yes, a weak or failing battery can reduce the power supplied to the glow plug system, potentially triggering the P1339 code.

10. How can I prevent the P1339 code from occurring in the future?

Regular maintenance, such as inspecting the glow plugs, wiring, and battery, can help prevent this code from reoccurring.

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