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Engine-Codes – GMC – P1337 GMC

P1337 GMC Code - Glow Plug Offset Not Learned

Quick Answer

The P1337 diagnostic trouble code for GMC vehicles specifically relates to the glow plug offset not being learned by the engine control module (ECM). Common causes include Faulty glow plugs, ECM software issues, Wiring or connection issues with the glow plug system. 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
P1337 GMC indicates Glow Plug Offset Not Learned.
Common causes
Common causes include Faulty glow plugs, ECM software issues, Wiring or connection issues with the glow plug system.
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 P1337 GMC Description

The P1337 diagnostic trouble code for GMC vehicles specifically relates to the glow plug offset not being learned by the engine control module (ECM). Glow plugs are essential components in diesel engines that help with cold starts by heating the combustion chamber. When the ECM fails to learn the correct offset for the glow plugs, it can lead to issues with starting the engine, especially in cold weather conditions. This can result in rough idling, decreased fuel efficiency, and potentially even engine misfires.

OBDII Code P1337 GMC - Glow Plug Offset Not Learned
P1337 GMC Code - Glow Plug Offset Not Learned

Common Causes of P1337 GMC

  1. Faulty glow plugs
  2. ECM software issues
  3. Wiring or connection issues with the glow plug system
  4. Corrosion or damage to the glow plug terminals
  5. Engine overheating leading to glow plug damage

Symptoms of P1337 GMC

  1. Difficulty starting the engine, especially in cold weather
  2. Rough idling or engine misfires
  3. Decreased fuel efficiency
  4. Illumination of the check engine light
  5. Reduced engine performance

How to Fix P1337 GMC

  1. Diagnose the specific glow plug(s) that are causing the issue using a scan tool
  2. Test the glow plugs for proper operation and resistance
  3. Check the wiring and connections for any damage or corrosion
  4. Replace any faulty glow plugs or repair any damaged wiring
  5. Reset the ECM and relearn the glow plug offset values

Cost to Fix P1337 GMC

The typical repair costs for addressing a P1337 GMC code can vary depending on the extent of the issue and the parts needed. On average, replacing a single glow plug can cost between $50 to $150, depending on the make and model of the vehicle. Labor costs can range from $100 to $300, depending on the shop's hourly rates and the complexity of the repair. It's advisable to consult with a trusted mechanic or dealership to get an accurate cost estimate based on your specific vehicle and location.

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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 P1337 GMC Code

1. What are the common symptoms of OBDII code P1337 GMC (Glow Plug Offset Not Learned)?

- Common symptoms may include hard starting, rough idling, decreased fuel efficiency, and potentially a Check Engine light.

2. What does the OBDII code P1337 GMC indicate?

- The code P1337 indicates that the ECM has not learned the offset value for the glow plug control module.

3. What are the possible causes of code P1337 GMC?

- Possible causes include a faulty glow plug control module, wiring issues, poor electrical connections, or a malfunctioning ECM.

4. How can I diagnose the cause of OBDII code P1337 GMC?

- Diagnose by checking the glow plug system for faults, inspecting wiring and connections, and using a scan tool to monitor the glow plug control module's data.

5. Can I still drive my vehicle with code P1337 GMC?

- It is not recommended to drive your vehicle with this code as it can lead to poor engine performance and potential starting issues.

6. How can I repair OBDII code P1337 GMC?

- Repair options include replacing the glow plug control module, repairing any wiring or connection issues, and clearing the code with a scan tool.

7. Is it possible to reset the code P1337 GMC without fixing the underlying issue?

- While you can clear the code with a scan tool, it is important to address the root cause to prevent the issue from reoccurring.

8. Can a DIY enthusiast fix OBDII code P1337 GMC at home?

- Depending on your skill level and tools available, some DIY enthusiasts may be able to diagnose and repair this code at home.

9. How much does it typically cost to repair OBDII code P1337 GMC at a mechanic?

- The cost of repair can vary depending on the exact cause, but it may range from $200 to $500 at a mechanic, including parts and labor.

10. Are there any preventive measures to avoid code P1337 GMC in the future?

- Regular maintenance of the glow plug system, checking for wiring issues, and ensuring proper electrical connections can help prevent code P1337 from appearing in the future.

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