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P133F 2016 GMC Sierra Code - Cylinder 8 Glow Plug Offset Exceeded Learning Limit

Quick Answer

The diagnostic trouble code P133F for a 2016 GMC Sierra indicates that the Cylinder 8 Glow Plug Offset has exceeded the learning limit. Common causes include Faulty glow plug for Cylinder 8, Damaged wiring or connectors in the glow plug circuit, Malfunctioning ECM. 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 Faulty glow plug for Cylinder 8, Damaged wiring or connectors in the glow plug circuit, Malfunctioning ECM.
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 16, 2024
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Code P133F 2016 GMC Sierra Description

The diagnostic trouble code P133F for a 2016 GMC Sierra indicates that the Cylinder 8 Glow Plug Offset has exceeded the learning limit. Glow plugs are essential components in diesel engines, especially during cold starts, as they heat the combustion chamber to facilitate ignition. When the glow plug offset exceeds the learning limit, it means that the engine control module (ECM) has detected a discrepancy in the glow plug performance for Cylinder 8. This could be due to issues with the glow plug itself, the wiring, or the ECM's ability to control the glow plug system effectively.

OBDII Code P133F 2016 GMC Sierra - Cylinder 8 Glow Plug Offset Exceeded Learning Limit
P133F 2016 GMC Sierra Code - Cylinder 8 Glow Plug Offset Exceeded Learning Limit

Common Causes of P133F 2016 GMC Sierra

  1. Faulty glow plug for Cylinder 8
  2. Damaged wiring or connectors in the glow plug circuit
  3. Malfunctioning ECM
  4. Carbon buildup on the glow plug tip
  5. Poor quality diesel fuel or contaminated fuel affecting glow plug performance

Symptoms of P133F 2016 GMC Sierra

  1. Hard starting, especially in cold weather
  2. Rough idling or misfiring
  3. Decreased fuel efficiency
  4. Illumination of the Check Engine Light
  5. Engine performance issues, such as lack of power or acceleration

How to Fix P133F 2016 GMC Sierra

  1. Begin by diagnosing the specific cause of the issue using a scan tool to pinpoint the Cylinder 8 glow plug offset problem.
  2. Inspect the glow plug for Cylinder 8 to determine if it is faulty or damaged. Replace the glow plug if necessary.
  3. Check the wiring and connectors in the glow plug circuit for any damage or corrosion. Repair or replace as needed.
  4. Clear the diagnostic trouble codes from the ECM and perform a test drive to ensure the issue has been resolved.
  5. If the problem persists, further diagnostics may be required to identify any underlying ECM issues or other potential causes.

Cost to Fix P133F 2016 GMC Sierra

The typical repair costs for addressing a Cylinder 8 Glow Plug Offset Exceeded Learning Limit code can vary depending on the specific cause of the issue. Replacement glow plugs typically range from $20 to $50 each, and labor costs can add another $100 to $200. Overall, the total repair cost could range from $150 to $300, but it's essential to consult with a qualified mechanic or dealership for a more accurate estimate based on your vehicle's make and model, as well as local labor rates.

What does this mean?

Tech Notes for P133F 2016 GMC Sierra

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

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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.

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