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P133E 2014 GMC Sierra Code - Cylinder 7 Glow Plug Offset Exceeded Learning Limit

Quick Answer

The P133E diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates that the glow plug offset for cylinder 7 has exceeded the learning limit. Common causes include Faulty glow plug in cylinder 7, Wiring or connection issues in the glow plug circuit, ECM software or calibration issues. 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 2014 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 in the glow plug circuit, ECM software or calibration issues.
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 P133E 2014 GMC Sierra Description

The P133E diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates that the glow plug offset for cylinder 7 has exceeded the learning limit. Glow plugs are essential components in diesel engines, as they heat the combustion chamber to aid in cold starting. When the glow plug offset exceeds the learning limit, it means that the engine control module (ECM) has detected a deviation from the expected values for cylinder 7's glow plug operation.

OBDII Code P133E 2014 GMC Sierra - Cylinder 7 Glow Plug Offset Exceeded Learning Limit
P133E 2014 GMC Sierra Code - Cylinder 7 Glow Plug Offset Exceeded Learning Limit

Common Causes of P133E 2014 GMC Sierra

  1. Faulty glow plug in cylinder 7.
  2. Wiring or connection issues in the glow plug circuit.
  3. ECM software or calibration issues.
  4. Sensor malfunction affecting glow plug operation.
  5. Engine operating in extreme cold conditions leading to excessive glow plug usage.

Symptoms of P133E 2014 GMC Sierra

  1. Difficulty starting the engine, especially in cold weather.
  2. Rough idling or misfiring.
  3. Decreased fuel efficiency.
  4. Increased emissions.
  5. Illumination of the check engine light.

How to Fix P133E 2014 GMC Sierra

  1. Diagnose the specific issue by using a scan tool to monitor glow plug operation and identify the faulty component.
  2. Inspect the glow plug in cylinder 7 for proper operation and replace if necessary.
  3. Check the wiring and connections in the glow plug circuit for any damage or corrosion, repairing or replacing as needed.
  4. Update the ECM software or recalibrate the glow plug control system to ensure proper operation.
  5. Test the vehicle to verify that the issue has been resolved and clear the DTC from the ECM memory.

Cost to Fix P133E 2014 GMC Sierra

The typical repair costs for addressing a P133E code in a 2014 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 or sensor issues may add to the total cost. Labor rates at auto repair shops can range from $80 to $150 per hour, so the total cost of the repair can vary based on the complexity of the issue and the shop's hourly rate. It's advisable to consult with a qualified mechanic to get an accurate estimate for addressing this specific DTC.

What does this mean?

Tech Notes for P133E 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 P133E 2014 GMC Sierra Code

1. What does the OBDII code P133E mean on a 2014 GMC Sierra?

P133E indicates that the glow plug offset for cylinder 7 has exceeded the learning limit, meaning there’s an issue with the glow plug circuit or calibration for that cylinder.

2. What are the symptoms of code P133E on a 2014 GMC Sierra?

Symptoms may include difficulty starting the engine in cold weather, rough idling, reduced fuel efficiency, and the check engine light being illuminated.

3. What causes the P133E code to appear in a 2014 GMC Sierra?

Common causes include a faulty glow plug, damaged glow plug wiring or connectors, a malfunctioning glow plug control module, or calibration issues with the glow plug system.

4. Can I drive my 2014 GMC Sierra with the P133E code active?

While the truck may still run, driving with this code can lead to harder engine starts in cold weather and potential long-term damage to the glow plug system. It’s best to address the issue promptly.

5. How do I diagnose the P133E code on my 2014 GMC Sierra?

Diagnosis involves testing the glow plug for cylinder 7, inspecting the wiring and connectors, and using a scan tool to verify the glow plug system's operation and offset values.

6. How do I fix the P133E code on a 2014 GMC Sierra?

Repairs may include replacing the cylinder 7 glow plug, repairing damaged wiring or connectors, reprogramming the engine control module (ECM), or replacing the glow plug control module if necessary.

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

The cost can vary, but replacing a glow plug typically ranges from $150 to $300, depending on labor rates and parts pricing. Additional costs may apply if other components need repair.

8. Can a faulty glow plug cause engine damage in a 2014 GMC Sierra?

While a single faulty glow plug usually won’t cause immediate engine damage, prolonged issues can lead to harder starts and increased stress on the engine, especially in cold conditions.

9. What tools are needed to fix the P133E code?

Common tools include a scan tool to read and clear codes, a multimeter to test electrical connections, and basic hand tools to remove and replace the glow plug or related components.

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

Regular maintenance, such as inspecting the glow plug system during service intervals and addressing any electrical issues promptly, can help prevent this code from recurring.

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