AutoCodes – Chevrolet – P1338 2017 Chevrolet Silverado

P1338 2017 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 2017 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 589

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 2017 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 2017 Chevrolet Silverado - Cylinder 1 Glow Plug Offset Exceeded Learning Limit - AutoCodes.com — P1338 2017 Chevrolet Silverado Code - Cylinder 1 Glow Plug Offset Exceeded Learning Limit

What does this mean?

What are the Possible Causes of the DTC P1338 2017 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 2017 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 2017 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 2017 Chevrolet Silverado code?

Need more information on how to fix the P1338 2017 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1338 2017 Chevrolet Silverado 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 P1338 2017 Chevrolet Silverado Code

What does the OBDII code P1338 mean on a 2017 Chevrolet Silverado?

P1338 indicates that the glow plug offset for cylinder 1 has exceeded the learning limit, meaning the engine control module (ECM) has detected an issue with the glow plug circuit or performance.

What are the symptoms of code P1338 in a 2017 Chevrolet Silverado?

Symptoms may include difficulty starting the engine in cold weather, rough idling, reduced fuel efficiency, or the check engine light being illuminated.

What causes the P1338 code on a 2017 Chevrolet Silverado?

Common causes include a faulty glow plug for cylinder 1, damaged wiring or connectors in the glow plug circuit, a defective glow plug control module, or an ECM software issue.

How is code P1338 diagnosed?

Technicians will check for stored codes, inspect the glow plug and wiring for cylinder 1, test the glow plug resistance, and verify proper operation of the glow plug control module.

Can I drive with the P1338 code on my Silverado?

While the vehicle may still be drivable, continuing to drive with this code can lead to difficulty starting in cold weather and potential long-term engine damage if left unresolved.

How do you fix the P1338 code on a 2017 Chevrolet Silverado?

Repairs may include replacing the faulty cylinder 1 glow plug, repairing damaged wiring or connectors, replacing the glow plug control module, or updating the ECM software.

What tools are needed to diagnose and fix the P1338 code?

Youâ€™ll typically need an OBDII scanner, a multimeter to test electrical components, and basic hand tools for replacing the glow plug or related components.

How much does it cost to fix code P1338 on a Chevrolet Silverado?

Repair costs vary but can range from $100 to $300 depending on whether the glow plug or control module needs replacement and labor rates in your area.

What happens if I ignore the P1338 code?

Ignoring the P1338 code can lead to poor cold-weather starting, reduced engine performance, and potential damage to other components in the glow plug system.

Is the P1338 code related to other OBDII codes?

Yes, it may be accompanied by other glow plug or cylinder-specific codes, such as P1337 or P1339, which indicate similar issues with other cylinders.