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P1338 2015 Chevrolet Silverado Code - Cylinder 1 Glow Plug Offset Exceeded Learning Limit

Quick Answer

The diagnostic trouble code P1338 on a 2015 Chevrolet Silverado indicates that the Cylinder 1 Glow Plug Offset has exceeded the learning limit. Common causes include Faulty glow plug in Cylinder 1, Wiring issues or connections related to the glow plug system, Malfunctioning glow plug control module. 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
P1338 2015 Chevrolet Silverado indicates Cylinder 1 Glow Plug Offset Exceeded Learning Limit.
Common causes
Common causes include Faulty glow plug in Cylinder 1, Wiring issues or connections related to the glow plug system, Malfunctioning glow plug control module.
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 12, 2024
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Code P1338 2015 Chevrolet Silverado Description

The diagnostic trouble code P1338 on a 2015 Chevrolet Silverado indicates that the Cylinder 1 Glow Plug Offset has exceeded the learning limit. In diesel engines, glow plugs are essential components that help heat the air in the combustion chamber to facilitate cold starts. When the glow plug offset exceeds the learning limit, it means that the engine control module (ECM) has detected a deviation from the expected values in the glow plug operation, specifically in Cylinder 1.

OBDII Code P1338 2015 Chevrolet Silverado - Cylinder 1 Glow Plug Offset Exceeded Learning Limit
P1338 2015 Chevrolet Silverado Code - Cylinder 1 Glow Plug Offset Exceeded Learning Limit

Common Causes of P1338 2015 Chevrolet Silverado

  1. Faulty glow plug in Cylinder 1
  2. Wiring issues or connections related to the glow plug system
  3. Malfunctioning glow plug control module
  4. ECM software or hardware issues
  5. Environmental factors such as extreme cold affecting glow plug performance

Symptoms of P1338 2015 Chevrolet Silverado

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

How to Fix P1338 2015 Chevrolet Silverado

  1. Begin by conducting a comprehensive diagnostic scan to confirm the P1338 code and pinpoint the exact cause of the issue.
  2. Inspect the glow plug in Cylinder 1 for any signs of damage or wear and replace if necessary.
  3. Check the wiring and connections associated with the glow plug system for any corrosion, damage, or loose connections.
  4. Test the glow plug control module for proper operation and replace if found to be faulty.
  5. Clear the trouble code from the ECM's memory and perform a test drive to ensure the issue has been resolved.

Cost to Fix P1338 2015 Chevrolet Silverado

The typical repair costs for addressing a P1338 code on a 2015 Chevrolet Silverado can vary depending on the specific cause of the issue. On average, the cost of replacing a glow plug in Cylinder 1 can range from $50 to $150 per plug, not including labor costs. Additional expenses may include diagnostic fees, parts, and labor, which can add up to a total repair cost of $200 to $500. It is important to note that labor rates at auto repair shops can vary, with hourly rates typically ranging between $80 and $150. For a more precise estimate, it is recommended to consult with a local auto repair professional.

What does this mean?

Tech Notes for P1338 2015 Chevrolet Silverado

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

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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 P1338 2015 Chevrolet Silverado Code

1. What does the OBDII code P1338 mean on a 2015 Chevrolet Silverado?

P1338 indicates that the cylinder 1 glow plug offset has exceeded the learning limit, meaning the glow plug system for cylinder 1 is not operating within its expected range.

2. What are the common symptoms of code P1338 in a 2015 Chevrolet Silverado?

Symptoms may include difficulty starting the engine, rough idling, increased exhaust smoke, reduced fuel efficiency, and the check engine light turning on.

3. What causes the P1338 code on a 2015 Chevrolet Silverado?

Common causes include a faulty glow plug in cylinder 1, a damaged glow plug control module, poor electrical connections, or carbon buildup around the glow plug.

4. Can I drive my 2015 Chevrolet Silverado with the P1338 code?

While the vehicle may still be drivable, prolonged operation with this code can lead to harder starts, increased emissions, and potential damage to other engine components. It’s best to address the issue promptly.

5. How do I diagnose the P1338 code on a 2015 Chevrolet Silverado?

Start by checking the glow plug in cylinder 1 for damage or wear. Inspect the wiring and connectors for any signs of corrosion or loose connections. Use a multimeter to test the glow plug’s resistance and verify proper operation.

6. How do I fix the P1338 code on my 2015 Chevrolet Silverado?

Repairs may include replacing the faulty glow plug, cleaning or replacing corroded connectors, repairing damaged wiring, or replacing the glow plug control module if needed.

7. How much does it cost to repair the P1338 code on a 2015 Chevrolet Silverado?

The cost of repairs can vary. Replacing a single glow plug typically costs $50–$150, while replacing the glow plug control module can cost $200–$500, depending on parts and labor.

8. Can a dirty injector cause the P1338 code on a 2015 Chevrolet Silverado?

While uncommon, a dirty or malfunctioning injector for cylinder 1 could potentially cause similar issues by affecting combustion, but it is less likely than a glow plug issue.

9. Does cold weather affect the P1338 code on a 2015 Chevrolet Silverado?

Yes, cold weather can exacerbate glow plug issues, as glow plugs are essential for starting a diesel engine in low temperatures.

10. How can I prevent the P1338 code from reoccurring on my 2015 Chevrolet Silverado?

Regular maintenance, including inspecting and replacing glow plugs as needed, checking for proper electrical connections, and cleaning carbon buildup, can help prevent this code.

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