AutoCodes – GMC – P133C 2014 GMC Sierra

P133C 2014 GMC Sierra Code - Cylinder 5 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 5, Glow Plug 5 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: P133C 2014 GMC Sierra indicates Cylinder 5 Glow Plug Offset Exceeded Learning Limit.
Common causes: Common causes include Perform Glow Plug Learn procedure, Faulty Glow Plug 5, Glow Plug 5 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 150

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 P133C 2014 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 P133C 2014 GMC Sierra - Cylinder 5 Glow Plug Offset Exceeded Learning Limit - AutoCodes.com — P133C 2014 GMC Sierra Code - Cylinder 5 Glow Plug Offset Exceeded Learning Limit

What does this mean?

What are the Possible Causes of the DTC P133C 2014 GMC Sierra?

Perform Glow Plug Learn procedure
Faulty Glow Plug 5
Glow Plug 5 harness is open or shorted
Glow Plug 5 circuit poor electrical connection

How to Fix the DTC P133C 2014 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 P133C 2014 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 P133C 2014 GMC Sierra code?

Need more information on how to fix the P133C 2014 GMC Sierra 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 P133C 2014 GMC Sierra Code

What does the OBDII code P133C mean for a 2014 GMC Sierra?

The P133C code indicates that the glow plug offset for cylinder 5 has exceeded the learning limit, meaning the glow plug or its circuit is not functioning within acceptable parameters.

What are the common symptoms of the P133C code?

Common symptoms include difficulty starting the engine in cold weather, reduced engine performance, increased emissions, and the illumination of the check engine light.

What causes the P133C code to appear?

The most common causes include a faulty glow plug for cylinder 5, wiring issues in the glow plug circuit, a malfunctioning glow plug control module, or excessive carbon buildup around the glow plug.

Can I drive my 2014 GMC Sierra with the P133C code?

While the vehicle may still be drivable, it can experience starting issues in cold weather and reduced efficiency. Prolonged driving without repair may lead to further engine problems.

How do I diagnose the P133C code?

Diagnosis typically involves scanning for codes with an OBDII scanner, inspecting the cylinder 5 glow plug and its wiring, testing the glow plug for continuity, and checking the glow plug control module.

How do I fix the P133C code?

Repairs may include replacing the cylinder 5 glow plug, repairing or replacing damaged wiring, cleaning carbon buildup, or replacing a faulty glow plug control module.

How much does it cost to fix the P133C code?

The repair cost depends on the issue, but replacing a glow plug typically costs $100-$200, including parts and labor. More extensive repairs, such as replacing the control module, can cost upwards of $500.

Can a dirty glow plug cause the P133C code?

Yes, excessive carbon buildup on the cylinder 5 glow plug can prevent it from functioning correctly and trigger the P133C code.

Is the P133C code related to cold weather performance?

Yes, the glow plug system is critical for starting the engine in cold weather. A malfunctioning glow plug can result in hard starting or no start conditions in low temperatures.

Do I need to reprogram the ECM after fixing the P133C code?

In most cases, a reprogramming or reset of the ECM is not necessary. Clearing the code with a scanner after making repairs should suffice.