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Engine-Codes – GMC – P133D 2016 GMC Sierra

P133D 2016 GMC Sierra Code - Cylinder 6 Glow Plug Offset Exceeded Learning Limit

Quick Answer

The diagnostic trouble code P133D for a 2016 GMC Sierra indicates that the Engine Control Module (ECM) has detected that the offset for the glow plug in cylinder 6 has exceeded the learning limit. Common causes include Faulty glow plug in cylinder 6, Wiring issues in the glow plug circuit, Malfunctioning glow plug control module. 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
P133D 2016 GMC Sierra indicates Cylinder 6 Glow Plug Offset Exceeded Learning Limit.
Common causes
Common causes include Faulty glow plug in cylinder 6, Wiring issues in the glow plug circuit, Malfunctioning glow plug control module.
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 14, 2024
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Code P133D 2016 GMC Sierra Description

The diagnostic trouble code P133D for a 2016 GMC Sierra indicates that the Engine Control Module (ECM) has detected that the offset for the glow plug in cylinder 6 has exceeded the learning limit. Glow plugs are essential components in diesel engines, as they heat the combustion chamber to facilitate cold starts. When the glow plug offset exceeds the learning limit, it means that the ECM is unable to control the glow plug's operation effectively, which can lead to issues with starting the engine, reduced fuel efficiency, and increased emissions.

OBDII Code P133D 2016 GMC Sierra - Cylinder 6 Glow Plug Offset Exceeded Learning Limit
P133D 2016 GMC Sierra Code - Cylinder 6 Glow Plug Offset Exceeded Learning Limit

Common Causes of P133D 2016 GMC Sierra

  1. Faulty glow plug in cylinder 6
  2. Wiring issues in the glow plug circuit
  3. Malfunctioning glow plug control module
  4. ECM malfunction
  5. Corrosion or poor connection in the glow plug circuit

Symptoms of P133D 2016 GMC Sierra

  1. Difficulty starting the engine, especially in cold weather
  2. Rough idling or running
  3. Engine misfires
  4. Reduced power output
  5. Increased emissions

How to Fix P133D 2016 GMC Sierra

  1. Diagnose the specific cause of the issue using a scan tool to pinpoint the faulty component.
  2. Inspect the glow plug in cylinder 6 for damage or wear and replace if necessary.
  3. Check the wiring in the glow plug circuit for any breaks, corrosion, or poor connections and repair as needed.
  4. Test the glow plug control module for proper operation and replace if faulty.
  5. Clear the diagnostic trouble codes from the ECM and perform a test drive to ensure the issue has been resolved.

Cost to Fix P133D 2016 GMC Sierra

The typical repair costs for addressing a P133D code in a 2016 GMC Sierra can vary depending on the specific cause of the issue. In general, replacing a glow plug can cost between $50 and $150 per plug, while diagnosing and repairing wiring issues or replacing the glow plug control module can range from $100 to $500. Labor costs can add an additional $80 to $150 per hour, and the total repair cost can range from $200 to $800 or more. It is advisable to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on the specific circumstances of the vehicle. Labor rates can vary based on location, vehicle make and model, and the complexity of the repair.

What does this mean?

Tech Notes for P133D 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 P133D 2016 GMC Sierra Code

1. What does the OBDII code P133D mean on a 2016 GMC Sierra?

P133D indicates that the Cylinder 6 glow plug offset has exceeded its learning limit, meaning the glow plug's performance is outside the acceptable range for proper operation.

2. What are the common symptoms of code P133D on a 2016 GMC Sierra?

Symptoms may include difficulty starting the engine in cold weather, rough idle, reduced fuel efficiency, or an illuminated check engine light.

3. What causes the P133D code to appear on my 2016 GMC Sierra?

Common causes include a faulty glow plug in cylinder 6, wiring issues such as damaged or corroded connections, or a problem with the glow plug control module.

4. Can I drive my 2016 GMC Sierra with the P133D code?

Driving with the P133D code may be possible, but it is not recommended, especially in cold weather, as starting difficulties or further engine damage could occur.

5. How can I diagnose the P133D code on my 2016 GMC Sierra?

Diagnosis involves inspecting the glow plug and its wiring for damage, testing the electrical resistance of the glow plug, and checking the function of the glow plug control module.

6. How do I fix the P133D code on a 2016 GMC Sierra?

Repairs may include replacing the faulty glow plug in cylinder 6, repairing or replacing damaged wiring, or addressing issues with the glow plug control module.

7. How much does it cost to repair the P133D code on a 2016 GMC Sierra?

The cost varies but typically ranges from $100 to $300 for glow plug replacement, depending on labor and parts costs.

8. Can a bad glow plug cause other engine issues on a 2016 GMC Sierra?

Yes, a bad glow plug can cause hard starts, rough idling, and increased emissions, especially in cold temperatures.

9. Do I need special tools to fix the P133D code on my 2016 GMC Sierra?

Basic tools may be sufficient, but a multimeter is often needed for testing glow plug resistance and wiring continuity.

10. How can I prevent the P133D code from recurring on my 2016 GMC Sierra?

Regular maintenance, including inspecting and replacing glow plugs as needed and keeping electrical connections clean and secure, can help prevent this code.

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