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Engine-Codes – GMC – P133E 2015 GMC Sierra

P133E 2015 GMC Sierra Code - Cylinder 7 Glow Plug Offset Exceeded Learning Limit

Quick Answer

The diagnostic trouble code P133E for a 2015 GMC Sierra indicates that the Engine Control Module (ECM) has detected that the offset for the glow plug in cylinder 7 has exceeded the learning limit. Common causes include Faulty glow plug in cylinder 7, Wiring or connection issues related to the glow plug, Malfunctioning Engine Control Module (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
P133E 2015 GMC Sierra indicates Cylinder 7 Glow Plug Offset Exceeded Learning Limit.
Common causes
Common causes include Faulty glow plug in cylinder 7, Wiring or connection issues related to the glow plug, Malfunctioning Engine Control Module (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 18, 2024
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Code P133E 2015 GMC Sierra Description

The diagnostic trouble code P133E for a 2015 GMC Sierra indicates that the Engine Control Module (ECM) has detected that the offset for the glow plug in cylinder 7 has exceeded the learning limit. Glow plugs are essential components in diesel engines, especially during cold starts, as they heat up the combustion chamber to facilitate ignition. When the offset exceeds the learning limit, it means that the ECM has detected a discrepancy between the expected and actual performance of the glow plug in cylinder 7.

OBDII Code P133E 2015 GMC Sierra - Cylinder 7 Glow Plug Offset Exceeded Learning Limit
P133E 2015 GMC Sierra Code - Cylinder 7 Glow Plug Offset Exceeded Learning Limit

Common Causes of P133E 2015 GMC Sierra

  1. Faulty glow plug in cylinder 7.
  2. Wiring or connection issues related to the glow plug.
  3. Malfunctioning Engine Control Module (ECM).
  4. Problems with engine temperature sensors.
  5. Corrosion or damage to electrical components.

Symptoms of P133E 2015 GMC Sierra

  1. Difficulties starting the engine, especially in cold weather.
  2. Rough idling or misfires.
  3. Decreased fuel efficiency.
  4. Increased emissions.
  5. Illumination of the Check Engine Light.

How to Fix P133E 2015 GMC Sierra

  1. Diagnose the specific cause of the issue using a diagnostic scanner to pinpoint the problem.
  2. Inspect the glow plug in cylinder 7 for any signs of damage or malfunction.
  3. Check the wiring and connections related to the glow plug for any faults or corrosion.
  4. Test the Engine Control Module (ECM) and engine temperature sensors for proper functionality.
  5. Replace the faulty glow plug, repair any wiring issues, or replace the ECM if necessary.

Cost to Fix P133E 2015 GMC Sierra

The typical repair costs for addressing a P133E code in a 2015 GMC Sierra can vary depending on the specific cause of the issue. Generally, replacing a glow plug can cost between $50 to $200 per plug, while diagnosing and repairing wiring or ECM issues can range from $100 to $500 or more. Labor costs at auto repair shops can vary between $80 and $150 per hour, so the total cost of repairs can add up based on the extent of the issue and the required repairs. It is advisable to consult with a trusted mechanic or repair shop for a more accurate estimate based on the specific circumstances of the vehicle.

What does this mean?

Tech Notes for P133E 2015 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 P133E 2015 GMC Sierra Code

1. What does the OBDII code P133E mean on a 2015 GMC Sierra?

P133E indicates that the glow plug offset for cylinder 7 has exceeded its learning limit, typically related to the glow plug system used in diesel engines for cold starts.

2. What are the symptoms of code P133E in a 2015 GMC Sierra?

Symptoms may include difficulty starting in cold weather, reduced engine performance, a rough idle, and the check engine light being illuminated.

3. What causes the P133E code to trigger in a 2015 GMC Sierra?

Common causes include a faulty glow plug in cylinder 7, issues with the glow plug control module, poor electrical connections, or excessive carbon buildup around the glow plug.

4. Can I drive my 2015 GMC Sierra with a P133E code?

While the truck may still be drivable, prolonged operation with this code can lead to hard starts and increased emissions, especially in cold weather. Prompt diagnosis and repair are recommended.

5. How do I diagnose the P133E code in a 2015 GMC Sierra?

Diagnosis typically involves inspecting the cylinder 7 glow plug for wear or damage, checking the wiring and connectors for continuity, and testing the glow plug control module.

6. How do I fix the P133E code on a 2015 GMC Sierra?

Repairs may involve replacing the faulty glow plug in cylinder 7, cleaning carbon buildup, repairing damaged wiring, or replacing the glow plug control module if necessary.

7. What tools are needed to diagnose and fix a P133E code?

Tools include an OBDII scanner, a multimeter for electrical testing, and possibly a socket set for removing and replacing the glow plug.

8. How much does it cost to repair the P133E code on a 2015 GMC Sierra?

Repair costs can range from $100 to $300, depending on whether just the glow plug needs replacement or if additional components like the control module are faulty.

9. Can a faulty glow plug in cylinder 7 cause engine damage?

A faulty glow plug itself won’t typically cause engine damage, but it can lead to starting issues and misfires, which over time may stress other engine components.

10. How can I prevent the P133E code from recurring?

Regular maintenance, including periodic inspection and replacement of glow plugs as needed, as well as keeping electrical connections clean and secure, can help prevent this issue.

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