AutoCodes – GMC – P133F 2016 GMC Sierra

P133F 2016 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 2016 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 158

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 2016 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 2016 GMC Sierra - Cylinder 8 Glow Plug Offset Exceeded Learning Limit - AutoCodes.com — P133F 2016 GMC Sierra Code - Cylinder 8 Glow Plug Offset Exceeded Learning Limit

What does this mean?

What are the Possible Causes of the DTC P133F 2016 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 2016 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 2016 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 2016 GMC Sierra code?

Need more information on how to fix the P133F 2016 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 P133F 2016 GMC Sierra Code

1. What does the OBDII code P133F mean on a 2016 GMC Sierra?

P133F indicates that the cylinder 8 glow plug offset has exceeded its learning limit, meaning the Engine Control Module (ECM) detected an issue with the glow plug's performance or calibration.

2. What are the common symptoms of code P133F on a 2016 GMC Sierra?

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

3. What causes the P133F code to appear on a 2016 GMC Sierra?

Common causes include a faulty glow plug, excessive carbon buildup around the glow plug, a damaged glow plug control module, or wiring issues related to cylinder 8.

4. Can a faulty glow plug cause engine performance problems?

Yes, a faulty glow plug can lead to hard starts, misfires, or rough idling, particularly in cold conditions where proper combustion is more difficult.

5. How can I diagnose the P133F code on my GMC Sierra?

Use an OBDII scanner to confirm the code, visually inspect the glow plug and its wiring, test the cylinder 8 glow plug for proper resistance, and check the glow plug control module for functionality.

6. Can carbon buildup trigger the P133F code?

Yes, carbon buildup around the cylinder 8 glow plug can affect its operation, leading to the offset exceeding its learning limit and triggering the code.

7. How do I fix the P133F code on my 2016 GMC Sierra?

Repairs may include replacing the cylinder 8 glow plug, cleaning carbon buildup, repairing damaged wiring, or replacing the glow plug control module if necessary.

8. Is it safe to drive with the P133F code active?

While the truck may still be drivable, ignoring the P133F code can lead to poor cold starts, increased emissions, and potential engine damage over time, so it should be addressed promptly.

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

Repair costs can vary but typically range from $50 to $150 for a glow plug replacement, plus labor. Additional costs may arise if the control module or wiring needs repair.

10. Can a P133F code clear itself after replacing the glow plug?

The code may not clear automatically. After replacing the glow plug or addressing the issue, use an OBDII scanner to clear the code and verify the repair.