AutoCodes – Chevrolet – P1338 2016 Chevrolet Silverado

P1338 2016 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 2016 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.

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Code Popularity 261

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 P1338 2016 Chevrolet Silverado 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 P1338 2016 Chevrolet Silverado - Cylinder 1 Glow Plug Offset Exceeded Learning Limit - AutoCodes.com — P1338 2016 Chevrolet Silverado Code - Cylinder 1 Glow Plug Offset Exceeded Learning Limit

What does this mean?

What are the Possible Causes of the DTC P1338 2016 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 2016 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.

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 P1338 2016 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.

Need more information about the P1338 2016 Chevrolet Silverado code?

Need more information on how to fix the P1338 2016 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 2016 Chevrolet Silverado Code

What does the OBDII code P1338 mean on a 2016 Chevrolet Silverado?

P1338 indicates that the Cylinder 1 Glow Plug Offset has exceeded its learning limit, which may suggest an issue with the glow plug system or its calibration.

What are the common symptoms of code P1338?

Symptoms may include difficulty starting the engine in cold weather, reduced fuel efficiency, a check engine light, and potential rough idling.

What causes the P1338 code to appear?

Possible causes include a faulty glow plug, damaged glow plug wiring, poor electrical connections, or an issue with the engine control module (ECM) calibration.

Can a bad glow plug trigger the P1338 code?

Yes, a defective glow plug in Cylinder 1 can cause the offset to exceed the learning limit, triggering this code.

How do you diagnose the P1338 code on a 2016 Chevrolet Silverado?

Diagnosis involves scanning for additional codes, inspecting the glow plug and wiring for Cylinder 1, and testing the glow plugâ€™s resistance and functionality.

Is it safe to drive with the P1338 code active?

While the vehicle may still operate, driving with this code can lead to poor cold-start performance and potential long-term engine issues if not addressed.

How do you fix the P1338 code?

Repairs may include replacing the Cylinder 1 glow plug, repairing damaged wiring, ensuring proper connections, or reprogramming the ECM if necessary.

What tools are needed to fix the P1338 code?

You may need an OBDII scanner, a multimeter for electrical testing, and basic hand tools to replace the glow plug or repair wiring.

Can clearing the P1338 code solve the problem?

Clearing the code may temporarily remove it, but the underlying issue needs to be addressed to prevent it from returning.

Will replacing all the glow plugs fix the P1338 code?

Replacing all glow plugs may help if multiple plugs are worn, but itâ€™s essential to diagnose and confirm that Cylinder 1's glow plug is the issue before replacing all of them.