P1338 2015 Chevrolet Silverado Code - Cylinder 1 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 1, Glow Plug 1 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
- P1338 2015 Chevrolet Silverado indicates Cylinder 1 Glow Plug Offset Exceeded Learning Limit.
- Common causes
- Common causes include Perform Glow Plug Learn procedure, Faulty Glow Plug 1, Glow Plug 1 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.
Code P1338 2015 Chevrolet Silverado Description
What are the Possible Causes of the DTC P1338 2015 Chevrolet Silverado?
- Perform Glow Plug Learn procedure
- Faulty Glow Plug 1
- Glow Plug 1 harness is open or shorted
- Glow Plug 1 circuit poor electrical connection
How to Fix the DTC P1338 2015 Chevrolet Silverado?
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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1338 2015 Chevrolet Silverado 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.
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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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