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P133D 2014 GMC Sierra Code - Cylinder 6 Glow Plug Offset Exceeded Learning Limit

Quick Answer

The diagnostic trouble code P133D for a 2014 GMC Sierra indicates that the Engine Control Module (ECM) has detected that the glow plug offset for cylinder 6 has exceeded the learning limit. Common causes include Faulty glow plug: A malfunctioning glow plug in cylinder 6, Wiring issues: Damaged or corroded wiring connections to the glow plug, ECM software glitch: An issue with the Engine Control Module software. 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 2014 GMC Sierra indicates Cylinder 6 Glow Plug Offset Exceeded Learning Limit.
Common causes
Common causes include Faulty glow plug: A malfunctioning glow plug in cylinder 6, Wiring issues: Damaged or corroded wiring connections to the glow plug, ECM software glitch: An issue with the Engine Control Module software.
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 P133D 2014 GMC Sierra Description

The diagnostic trouble code P133D for a 2014 GMC Sierra indicates that the Engine Control Module (ECM) has detected that the glow plug offset for cylinder 6 has exceeded the learning limit. Glow plugs are essential components in diesel engines that help with cold starting by heating the combustion chamber. When the glow plug offset exceeds the learning limit, it means that the ECM is unable to control the glow plug operation effectively for cylinder 6. This can lead to issues with cold starting, reduced engine performance, increased emissions, and potential long-term damage to the engine if left unaddressed.

OBDII Code P133D 2014 GMC Sierra - Cylinder 6 Glow Plug Offset Exceeded Learning Limit
P133D 2014 GMC Sierra Code - Cylinder 6 Glow Plug Offset Exceeded Learning Limit

Common Causes of P133D 2014 GMC Sierra

  1. Faulty glow plug: A malfunctioning glow plug in cylinder 6.
  2. Wiring issues: Damaged or corroded wiring connections to the glow plug.
  3. ECM software glitch: An issue with the Engine Control Module software.
  4. Glow plug control module failure: The module responsible for controlling the glow plugs may be faulty.
  5. Engine temperature sensor malfunction: A faulty engine temperature sensor can affect glow plug operation.

Symptoms of P133D 2014 GMC Sierra

  1. Hard starting: Difficulty starting the engine, especially in cold weather.
  2. Rough idling: Engine may run unevenly or with vibrations at idle.
  3. Decreased fuel efficiency: The vehicle may consume more fuel than usual.
  4. Loss of power: Reduced engine power and acceleration.
  5. Check Engine Light: The illumination of the Check Engine Light on the dashboard.

How to Fix P133D 2014 GMC Sierra

  1. Diagnose the issue: Use a scan tool to retrieve the trouble code and perform further diagnostics to pinpoint the exact cause.
  2. Inspect glow plug: Check the condition of the glow plug in cylinder 6 and replace if necessary.
  3. Check wiring: Inspect the wiring harness for any damage or corrosion and repair as needed.
  4. Update ECM software: If a software glitch is suspected, update the Engine Control Module software to the latest version.
  5. Test glow plug control module: Test the glow plug control module for proper operation and replace if faulty.

Cost to Fix P133D 2014 GMC Sierra

The cost of repairing a Cylinder 6 Glow Plug Offset Exceeded Learning Limit issue can vary depending on the specific cause of the problem. Generally, the cost of replacing a glow plug can range from $50 to $150 per plug, with labor costs adding an additional $100 to $200. If wiring repairs or ECM software updates are required, additional costs may apply. Overall, the total repair cost for this issue could range from $200 to $500 or more. It's important to note that 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 P133D 2014 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 2014 GMC Sierra Code

1. What does the OBDII code P133D mean on a 2014 GMC Sierra?

P133D indicates that the cylinder 6 glow plug offset has exceeded the learning limit, meaning the engine control module (ECM) has detected an issue with the glow plug's performance or calibration.

2. What are the common symptoms of the P133D code on a 2014 GMC Sierra?

Symptoms may include difficulty starting in cold weather, reduced engine performance, illumination of the check engine light, and increased exhaust emissions.

3. What causes the P133D code to appear on a 2014 GMC Sierra?

Possible causes include a faulty glow plug, poor electrical connection to the glow plug, damaged wiring or harness, or an issue with the ECM's calibration or learning process.

4. Can I drive my 2014 GMC Sierra with the P133D code?

Driving with this code is possible but not recommended, especially in cold weather, as it may lead to starting issues or increased wear on the engine.

5. How do I diagnose the P133D code on a 2014 GMC Sierra?

Diagnosis involves checking the glow plug and wiring for cylinder 6, testing the electrical resistance of the glow plug, and ensuring proper communication with the ECM.

6. How do I fix the P133D code on a 2014 GMC Sierra?

Common repairs include replacing the faulty cylinder 6 glow plug, repairing damaged wiring or connectors, and clearing the code with a scan tool after the issue is resolved.

7. How much does it cost to fix the P133D code on a 2014 GMC Sierra?

Repair costs vary but typically range from $100 to $300, depending on whether the glow plug, wiring, or other components need replacement.

8. Can a faulty ECM cause the P133D code on a 2014 GMC Sierra?

While rare, a faulty ECM or improper calibration can cause this code. It's best to rule out the glow plug and wiring issues first.

9. What tools are needed to troubleshoot the P133D code on a 2014 GMC Sierra?

Basic tools include a digital multimeter for testing resistance and voltage, a scan tool to read and clear codes, and potentially a socket set to replace the glow plug.

10. How can I prevent the P133D code from recurring on my 2014 GMC Sierra?

Regular maintenance, including inspecting and replacing glow plugs as needed, checking electrical connections, and updating the ECM software when available, can help prevent recurrence.

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