P1339 2017 GMC Sierra Code - Cylinder 2 Glow Plug Offset Exceeded Learning Limit
Quick Answer
The diagnostic trouble code P1339 for a 2017 GMC Sierra indicates that there is an issue with the glow plug in cylinder 2. Common causes include Faulty glow plug: The glow plug in cylinder 2 may be malfunctioning or failing, Wiring issues: There could be a wiring problem causing a poor connection to the glow plug, ECM malfunction: The engine control module may be sending incorrect signals to the glow plug. 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 2017 GMC Sierra indicates Cylinder 2 Glow Plug Offset Exceeded Learning Limit.
- Common causes
- Common causes include Faulty glow plug: The glow plug in cylinder 2 may be malfunctioning or failing, Wiring issues: There could be a wiring problem causing a poor connection to the glow plug, ECM malfunction: The engine control module may be sending incorrect signals to the glow plug.
- 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 P1339 2017 GMC Sierra Description
The diagnostic trouble code P1339 for a 2017 GMC Sierra indicates that there is an issue with the glow plug in cylinder 2. Glow plugs are used in diesel engines to help with cold starting by heating the combustion chamber before ignition. When the glow plug offset exceeds the learning limit, it means that the engine control module (ECM) has detected that the glow plug in cylinder 2 is not operating within the expected parameters. This can lead to difficulties in starting the engine, reduced fuel efficiency, and potentially engine misfires. If left unaddressed, this issue can cause long-term damage to the engine and exhaust system.
Common Causes of P1339 2017 GMC Sierra
- Faulty glow plug: The glow plug in cylinder 2 may be malfunctioning or failing.
- Wiring issues: There could be a wiring problem causing a poor connection to the glow plug.
- ECM malfunction: The engine control module may be sending incorrect signals to the glow plug.
- Carbon buildup: Excessive carbon deposits on the glow plug can affect its performance.
- Environmental factors: Extreme cold temperatures can impact the functionality of the glow plug.
Symptoms of P1339 2017 GMC Sierra
- Hard starting: Difficulty starting the engine, especially in cold weather.
- Reduced fuel efficiency: The vehicle may experience decreased fuel economy due to inefficient combustion.
- Engine misfires: Cylinder 2 may experience misfires, leading to rough idling or poor performance.
- Illuminated check engine light: The ECM will trigger the check engine light to alert the driver of a potential issue.
How to Fix P1339 2017 GMC Sierra
- Diagnose the issue: Use a diagnostic scanner to read the trouble code and pinpoint the exact cause of the problem.
- Inspect the glow plug: Check the condition of the glow plug in cylinder 2 for any signs of damage or wear.
- Test the wiring: Verify that the wiring connected to the glow plug is in good condition and properly connected.
- Replace the glow plug: If the glow plug is faulty, replace it with a new one that meets the manufacturer's specifications.
- Clear the code: After completing the repair, clear the trouble code from the ECM to reset the system and ensure the issue has been resolved.
Cost to Fix P1339 2017 GMC Sierra
The cost of repairing a cylinder 2 glow plug offset exceeded learning limit code can vary depending on the specific cause of the issue and the labor rates in your area. Generally, the cost of replacing a glow plug can range from $50 to $150 per plug, with additional costs for diagnostic testing and labor. Overall, you can expect to pay anywhere from $150 to $400 for parts and labor. Keep in mind that prices may be higher at dealerships or in metropolitan areas, so it's recommended to get quotes from multiple auto repair shops to find the best price.
Tech Notes for P1339 2017 GMC Sierra
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Frequently Asked Questions about P1339 2017 GMC Sierra Code
1. What does the OBDII code P1339 mean on a 2017 GMC Sierra?
P1339 indicates that the Cylinder 2 Glow Plug Offset has exceeded its learning limit, meaning the glow plug system in that cylinder is not operating within the expected parameters.
2. What are the common symptoms of code P1339 on a GMC Sierra?
Symptoms may include a check engine light, difficulty starting in cold weather, reduced engine performance, or excessive exhaust smoke during startup.
3. What causes the P1339 code on a 2017 GMC Sierra?
Common causes include a faulty glow plug, poor electrical connection at the glow plug, a malfunctioning glow plug control module, or carbon buildup affecting the glow plug's performance.
4. Can I drive my GMC Sierra with the P1339 code active?
While the truck may still be drivable, driving with this code can lead to harder starts in cold weather and potentially damage other components over time. It's best to address the issue promptly.
5. How do I diagnose the P1339 code on a GMC Sierra?
Diagnosis typically involves checking the glow plug for cylinder 2, inspecting the wiring and connections, testing the glow plug control module, and possibly performing a resistance test on the glow plug.
6. How do I fix the P1339 code on a 2017 GMC Sierra?
Repairs may include replacing the cylinder 2 glow plug, cleaning carbon buildup, repairing or replacing damaged wiring, or replacing the glow plug control module if it's faulty.
7. How much does it cost to fix the P1339 code on a GMC Sierra?
The cost can vary, but replacing a glow plug typically ranges from $100 to $300, depending on labor rates and parts pricing. Additional repairs may increase the cost.
8. Can a bad glow plug cause other issues in the engine?
Yes, a faulty glow plug can cause cold starting problems, increased emissions, and potentially lead to incomplete combustion in the affected cylinder.
9. How can I prevent the P1339 code from returning on my GMC Sierra?
Regular maintenance, including inspecting the glow plug system and ensuring wiring and connections remain in good condition, can help prevent this issue.
10. Is the P1339 code specific to GMC vehicles?
No, the P1339 code can appear on other diesel vehicles as well, but the description and troubleshooting steps may vary based on the manufacturer.
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