AutoCodes – GMC – P1339 2015 GMC Sierra

P1339 2015 GMC Sierra 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 2015 GMC Sierra 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.

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Code Popularity 175

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
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Code P1339 2015 GMC Sierra 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 2015 GMC Sierra - Cylinder 2 Glow Plug Offset Exceeded Learning Limit - AutoCodes.com — P1339 2015 GMC Sierra Code - Cylinder 2 Glow Plug Offset Exceeded Learning Limit

What does this mean?

What are the Possible Causes of the DTC P1339 2015 GMC Sierra?

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 2015 GMC Sierra?

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 2015 GMC Sierra 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 2015 GMC Sierra code?

Need more information on how to fix the P1339 2015 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1339 2015 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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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