AutoCodes – GMC – P1339 GMC

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

Quick Answer

The Glow Plug Control Module has not learned the glow plug offset values. Common causes include Perform Glow Plug Learn procedure, Faulty Glow Plug 2, Glow Plug 2 harness is open or shorted. 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 GMC indicates Cylinder 2 Glow Plug Offset Exceeded Learning Limit.
Common causes: Common causes include Perform Glow Plug Learn procedure, Faulty Glow Plug 2, Glow Plug 2 harness is open or shorted.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 4,704

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 30, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1339 GMC Description

The Glow Plug Control Module has not learned the glow plug offset values. If a glow plug has been replaced and the glow plug learn was not performed, or if the Glow Plug Control Module experiences an Electronically Erasable Programmable Read Only Memory (EEPROM) error or data corruption, this Diagnostic Trouble Code (DTC) to set. The DTC will be set if the glow plug hot resistance is outside a predefined threshold.

OBDII Code P1339 GMC - Cylinder 2 Glow Plug Offset Exceeded Learning Limit - AutoCodes.com — P1339 GMC Code - Cylinder 2 Glow Plug Offset Exceeded Learning Limit

What does this mean?

What are the Possible Causes of the DTC P1339 GMC?

Perform Glow Plug Learn procedure
Faulty Glow Plug 2
Glow Plug 2 harness is open or shorted
Glow Plug 2 circuit poor electrical connection

How to Fix the DTC P1339 GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

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

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1339 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1339 GMC code?

Need more information on how to fix the P1339 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1339 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P1339 2014 GMC Sierra — Cylinder 2 Glow Plug Offset Exceeded Learning Limit
P1339 2015 GMC Sierra — Cylinder 2 Glow Plug Offset Exceeded Learning Limit
P1339 2016 GMC Sierra — Cylinder 2 Glow Plug Offset Exceeded Learning Limit
P1339 2017 GMC Sierra — Cylinder 2 Glow Plug Offset Exceeded Learning Limit
P1339 2018 GMC Sierra — Cylinder 2 Glow Plug Offset Exceeded Learning Limit

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 GMC Code

1. What are the common symptoms of OBDII code P1339 GMC?

- Common symptoms include rough idle, decreased engine performance, and an illuminated check engine light.

2. What does the OBDII code P1339 GMC Cylinder 2 Glow Plug Offset Exceeded Learning Limit mean?

- This code indicates that the engine control module has detected an issue with the glow plug system in cylinder 2, specifically related to the offset learning limit.

3. What are the possible causes of OBDII code P1339 GMC?

- Possible causes include faulty glow plug in cylinder 2, wiring issues in the glow plug circuit, a malfunctioning engine control module, or software-related issues.

4. How can I diagnose OBDII code P1339 GMC?

- Diagnosis typically involves using a scan tool to retrieve the code, inspecting the glow plug in cylinder 2, checking the wiring for any damage, and testing the engine control module.

5. Can I still drive my vehicle with OBDII code P1339 GMC?

- It is not recommended to drive your vehicle with this code present, as it can lead to further engine damage or performance issues.

6. How can I repair OBDII code P1339 GMC?

- Repair may involve replacing the glow plug in cylinder 2, repairing any damaged wiring, resetting the engine control module, or updating software as needed.

7. Is OBDII code P1339 GMC a common issue in GMC vehicles?

- While not extremely common, this code can occur in GMC vehicles with glow plug systems, particularly in diesel engines.

8. Can I reset OBDII code P1339 GMC without fixing the underlying issue?

- While you can clear the code temporarily, it is important to address the underlying problem to prevent further issues and potential damage to your vehicle.

9. How much does it cost to repair OBDII code P1339 GMC at a repair shop?

- Repair costs can vary depending on the exact cause of the issue, but expect to pay for parts and labor, which may range from $100 to $500 or more.

10. Are there any preventive measures to avoid OBDII code P1339 GMC in the future?

- Regular maintenance of the glow plug system, including inspection and replacement as needed, can help prevent this code from occurring in the future.