AutoCodes – GMC – P133F 2015 GMC Sierra

P133F 2015 GMC Sierra Code - Cylinder 8 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 8, Glow Plug 8 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: P133F 2015 GMC Sierra indicates Cylinder 8 Glow Plug Offset Exceeded Learning Limit.
Common causes: Common causes include Perform Glow Plug Learn procedure, Faulty Glow Plug 8, Glow Plug 8 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 134

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 P133F 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 P133F 2015 GMC Sierra - Cylinder 8 Glow Plug Offset Exceeded Learning Limit - AutoCodes.com — P133F 2015 GMC Sierra Code - Cylinder 8 Glow Plug Offset Exceeded Learning Limit

What does this mean?

What are the Possible Causes of the DTC P133F 2015 GMC Sierra?

Perform Glow Plug Learn procedure
Faulty Glow Plug 8
Glow Plug 8 harness is open or shorted
Glow Plug 8 circuit poor electrical connection

How to Fix the DTC P133F 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 P133F 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 P133F 2015 GMC Sierra code?

Need more information on how to fix the P133F 2015 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P133F 2015 GMC Sierra 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 P133F 2015 GMC Sierra Code

What does OBDII code P133F mean on a 2015 GMC Sierra?

Code P133F indicates that the offset value for Cylinder 8's glow plug has exceeded the learning limit, which may suggest an issue with the glow plug system or related components.

What are the common symptoms of code P133F in a 2015 GMC Sierra?

Symptoms may include difficulty starting the engine in cold weather, rough idling, reduced engine performance, and an illuminated check engine light.

What causes the P133F code to appear?

Common causes include a faulty glow plug in Cylinder 8, wiring issues, a malfunctioning glow plug control module, or excessive carbon buildup affecting the glow plug's operation.

Can I drive my GMC Sierra with code P133F?

While the vehicle may still be drivable, ignoring this code can lead to increased wear on the engine and difficulty starting in cold conditions. It's best to address the issue promptly.

How is code P133F diagnosed?

A technician will use a diagnostic scanner to confirm the code, inspect the glow plug and related wiring for Cylinder 8, and check for signs of carbon buildup or module failure.

How do you fix the P133F code on a 2015 GMC Sierra?

Repairs may involve replacing the faulty glow plug, cleaning carbon deposits, repairing damaged wiring, or replacing the glow plug control module if necessary.

Can a faulty glow plug cause long-term damage?

Yes, a malfunctioning glow plug can lead to poor combustion, increased emissions, and potential damage to the engine if left unresolved.

How much does it cost to fix code P133F on a GMC Sierra?

The repair cost can vary, but replacing a single glow plug typically ranges from $100 to $300, depending on labor rates and parts pricing.

Can I replace the glow plug myself to fix P133F?

If you have mechanical experience and the proper tools, you can replace a glow plug yourself. However, professional diagnosis is recommended to ensure the issue is correctly identified.

What tools are needed to replace a glow plug in a GMC Sierra?

Common tools include a socket set, torque wrench, anti-seize compound, and possibly a specialty glow plug removal tool, depending on the engine design.