AutoCodes – GMC – P133A 2014 GMC Sierra

P133A 2014 GMC Sierra Code - Cylinder 3 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 3, Glow Plug 3 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: P133A 2014 GMC Sierra indicates Cylinder 3 Glow Plug Offset Exceeded Learning Limit.
Common causes: Common causes include Perform Glow Plug Learn procedure, Faulty Glow Plug 3, Glow Plug 3 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 215

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 P133A 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 P133A 2014 GMC Sierra - Cylinder 3 Glow Plug Offset Exceeded Learning Limit - AutoCodes.com — P133A 2014 GMC Sierra Code - Cylinder 3 Glow Plug Offset Exceeded Learning Limit

What does this mean?

What are the Possible Causes of the DTC P133A 2014 GMC Sierra?

Perform Glow Plug Learn procedure
Faulty Glow Plug 3
Glow Plug 3 harness is open or shorted
Glow Plug 3 circuit poor electrical connection

How to Fix the DTC P133A 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 P133A 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 P133A 2014 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 P133A 2014 GMC Sierra Code

What does OBDII code P133A mean for a 2014 GMC Sierra?

OBDII code P133A indicates that the Cylinder 3 glow plug offset has exceeded the learning limit, suggesting an issue with the glow plug or its control circuit.

What symptoms might I experience if my GMC Sierra has code P133A?

Common symptoms include hard starting, rough idling, poor fuel economy, and increased exhaust emissions, particularly in cold weather.

What could cause the P133A code to trigger in my GMC Sierra?

Possible causes include a faulty glow plug, a malfunctioning glow plug control module, wiring issues, or a problem with the engine control unit (ECU).

How can I diagnose the issue related to code P133A?

Begin by visually inspecting the glow plug and its wiring for damage, then use a multimeter to test the glow plugâ€™s resistance. You may also need to scan for other related trouble codes.

What repairs are typically needed to fix the P133A code?

Repairs may involve replacing the faulty glow plug, repairing damaged wiring, or replacing the glow plug control module if it is malfunctioning.

Can I continue to drive my GMC Sierra with code P133A?

While it may be drivable, it is not recommended to ignore this code, as it can lead to starting issues and increased emissions. Addressing it sooner can prevent further engine damage.

Will resetting the code P133A clear the problem?

Resetting the code will clear the error, but if the underlying issue is not resolved, the code will likely return after the vehicle is driven.

How can I prevent code P133A from occurring in the future?

Regular maintenance, including checking and replacing glow plugs as needed, and ensuring the electrical connections are clean and secure, can help prevent this code from reappearing.

Is it safe to replace only the glow plug for code P133A?

While replacing the glow plug may resolve the issue, itâ€™s advisable to diagnose the entire system to ensure there are no other underlying problems that could cause future codes.