AutoCodes – GMC – P133B 2015 GMC Sierra

P133B 2015 GMC Sierra Code - Cylinder 4 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 4, Glow Plug 4 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: P133B 2015 GMC Sierra indicates Cylinder 4 Glow Plug Offset Exceeded Learning Limit.
Common causes: Common causes include Perform Glow Plug Learn procedure, Faulty Glow Plug 4, Glow Plug 4 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 166

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 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 P133B 2015 GMC Sierra 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 P133B 2015 GMC Sierra - Cylinder 4 Glow Plug Offset Exceeded Learning Limit - AutoCodes.com — P133B 2015 GMC Sierra Code - Cylinder 4 Glow Plug Offset Exceeded Learning Limit

What does this mean?

What are the Possible Causes of the DTC P133B 2015 GMC Sierra?

Perform Glow Plug Learn procedure
Faulty Glow Plug 4
Glow Plug 4 harness is open or shorted
Glow Plug 4 circuit poor electrical connection

How to Fix the DTC P133B 2015 GMC Sierra?

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 P133B 2015 GMC Sierra 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 P133B 2015 GMC Sierra code?

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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 P133B 2015 GMC Sierra Code

1. What does the OBDII code P133B mean on a 2015 GMC Sierra?

The code P133B indicates that the glow plug offset for cylinder 4 has exceeded the allowable learning limit, suggesting an issue with the glow plug system.

2. What are the symptoms of code P133B on a 2015 GMC Sierra?

Symptoms may include difficulty starting the engine in cold weather, reduced engine performance, increased emissions, or an illuminated check engine light.

3. What causes the P133B code to appear?

Common causes include a faulty glow plug, damaged glow plug control module, wiring issues, or excessive carbon buildup around the glow plug.

4. Can I drive my 2015 GMC Sierra with the P133B code active?

While you can drive with this code, ignoring it may lead to harder starts in cold conditions and potential long-term engine issues. Prompt repair is recommended.

5. How do I diagnose the P133B code on a 2015 GMC Sierra?

Diagnosis typically involves scanning for codes, testing the cylinder 4 glow plug for resistance, inspecting wiring and connectors, and checking the glow plug control module functionality.

6. How do I fix the P133B code on a 2015 GMC Sierra?

Repairs may include replacing the faulty cylinder 4 glow plug, repairing damaged wiring, cleaning carbon buildup, or replacing the glow plug control module if necessary.

7. What tools are needed to troubleshoot the P133B code?

Essential tools include an OBDII scanner, multimeter for resistance testing, and possibly basic hand tools to access and replace the glow plug.

8. How much does it cost to fix the P133B code on a 2015 GMC Sierra?

Repair costs vary but typically range from $50 to $200 for a glow plug replacement, depending on labor and parts pricing.

9. Can the P133B code clear itself after repairs?

No, the code may need to be cleared using an OBDII scanner after repairs are completed to ensure the issue is resolved.

10. What happens if the P133B code is not addressed?

If left unresolved, it can lead to harder cold starts, increased emissions, reduced fuel efficiency, and potential damage to the glow plug control system.