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Engine-Codes – GMC – P133F 2017 GMC Sierra

P133F 2017 GMC Sierra Code - Cylinder 8 Glow Plug Offset Exceeded Learning Limit

Quick Answer

The diagnostic trouble code P133F on a 2017 GMC Sierra indicates that the Engine Control Module (ECM) has detected that the offset value for the glow plug in cylinder 8 has exceeded the learning limit. Common causes include Faulty glow plug: The glow plug in cylinder 8 may be defective or worn out, Wiring issues: There could be a problem with the wiring connecting the glow plug to the ECM, Malfunctioning glow plug control module: The control module that regulates the glow plug operation may be faulty. 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 2017 GMC Sierra indicates Cylinder 8 Glow Plug Offset Exceeded Learning Limit.
Common causes
Common causes include Faulty glow plug: The glow plug in cylinder 8 may be defective or worn out, Wiring issues: There could be a problem with the wiring connecting the glow plug to the ECM, Malfunctioning glow plug control module: The control module that regulates the glow plug operation may be faulty.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 17, 2024
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Code P133F 2017 GMC Sierra Description

The diagnostic trouble code P133F on a 2017 GMC Sierra indicates that the Engine Control Module (ECM) has detected that the offset value for the glow plug in cylinder 8 has exceeded the learning limit. Glow plugs are essential components in diesel engines that help with cold starts by heating the combustion chamber. When the ECM detects that the offset value for the glow plug in cylinder 8 is out of range, it means that the glow plug is not functioning properly, which can lead to issues with starting the engine, reduced fuel efficiency, and increased emissions.

OBDII Code P133F 2017 GMC Sierra - Cylinder 8 Glow Plug Offset Exceeded Learning Limit
P133F 2017 GMC Sierra Code - Cylinder 8 Glow Plug Offset Exceeded Learning Limit

Common Causes of P133F 2017 GMC Sierra

  1. Faulty glow plug: The glow plug in cylinder 8 may be defective or worn out.
  2. Wiring issues: There could be a problem with the wiring connecting the glow plug to the ECM.
  3. Malfunctioning glow plug control module: The control module that regulates the glow plug operation may be faulty.
  4. ECM issue: The Engine Control Module may be malfunctioning, causing incorrect readings and triggering the code.

Symptoms of P133F 2017 GMC Sierra

  1. Hard starting: The engine may have difficulty starting, especially in cold weather.
  2. Rough idling: The vehicle may idle roughly or inconsistently.
  3. Misfires: Cylinder 8 may experience misfires, leading to a loss of power and rough running.
  4. Decreased power: The vehicle may lack power during acceleration.
  5. Increased fuel consumption: The engine may consume more fuel than usual due to inefficient combustion.

How to Fix P133F 2017 GMC Sierra

  1. Diagnose the issue: Use a scan tool to read the code and perform a visual inspection of the glow plug and wiring.
  2. Test the glow plug: Check the resistance of the glow plug to determine if it is functioning correctly.
  3. Check wiring: Inspect the wiring for any damage or loose connections and repair as needed.
  4. Replace glow plug: If the glow plug is faulty, replace it with a new one.
  5. Clear the code: After completing the repair, clear the code from the ECM memory to reset the system.

Cost to Fix P133F 2017 GMC Sierra

The cost of repairing the Cylinder 8 Glow Plug Offset Exceeded Learning Limit code on a 2017 GMC Sierra can vary depending on the specific cause of the issue. Generally, the cost of replacing a glow plug ranges from $50 to $150 per plug, and the labor cost for this repair can be around $100 to $200. The total cost, including parts and labor, may range from $200 to $500. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate.

What does this mean?

Tech Notes for P133F 2017 GMC Sierra

If a Glow Plug was replaced, perform a Glow Plug Learn procedure with a Scan Tool.

Need more information about the P133F 2017 GMC Sierra 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 2017 GMC Sierra Code

1. What does the OBDII code P133F mean on a 2017 GMC Sierra?

P133F stands for "Cylinder 8 Glow Plug Offset Exceeded Learning Limit," indicating an issue with the glow plug's performance or calibration in cylinder 8.

2. What are the common symptoms of the P133F code on a 2017 GMC Sierra?

Common symptoms include difficulty starting in cold weather, rough idling, reduced engine performance, or an illuminated check engine light.

3. What causes the P133F code to appear on a 2017 GMC Sierra?

The primary causes include a faulty glow plug, poor electrical connections, carbon buildup on the glow plug, or a malfunctioning glow plug control module.

4. Can driving with the P133F code cause damage to my GMC Sierra?

Driving with this code may lead to poor cold-start performance and increased emissions, but it’s not typically an immediate risk to the engine. However, prolonged neglect could cause further issues.

5. How do I diagnose the P133F code on my 2017 GMC Sierra?

Diagnosis involves checking the glow plug in cylinder 8 for proper function, inspecting electrical connections for corrosion or damage, and testing the glow plug control module.

6. How do I fix the P133F code on a 2017 GMC Sierra?

Repairs may include replacing the cylinder 8 glow plug, cleaning or replacing corroded connectors, or replacing the glow plug control module if it’s found to be faulty.

7. How much does it cost to repair the P133F code?

The cost depends on the specific repair needed. Replacing a glow plug typically costs $100–$250, while a glow plug control module replacement may cost $300–$500, including labor.

8. Can I clear the P133F code without fixing the issue?

Clearing the code without fixing the underlying issue will likely cause the code to return and won’t resolve the performance problems.

9. Is the P133F code specific to the 2017 GMC Sierra?

While the P133F code is common in GMC and Chevrolet diesel trucks using Duramax engines, it specifically pertains to cylinder 8 glow plug issues in those vehicles.

10. How can I prevent the P133F code from recurring on my GMC Sierra?

Regular maintenance, such as inspecting the glow plugs and connectors, and using high-quality diesel fuel to reduce carbon buildup, can help prevent this issue.

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