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Engine-Codes – GMC – P133A 2016 GMC Sierra

P133A 2016 GMC Sierra Code - Cylinder 3 Glow Plug Offset Exceeded Learning Limit

Quick Answer

The P133A diagnostic trouble code (DTC) specifically relates to a fault with the glow plug in cylinder 3 of a 2016 GMC Sierra. Common causes include Faulty glow plug in cylinder 3, Wiring issues or poor electrical connection to the glow plug, ECM software glitches. 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
P133A 2016 GMC Sierra indicates Cylinder 3 Glow Plug Offset Exceeded Learning Limit.
Common causes
Common causes include Faulty glow plug in cylinder 3, Wiring issues or poor electrical connection to the glow plug, ECM software glitches.
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 Aug 19, 2024
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Code P133A 2016 GMC Sierra Description

The P133A diagnostic trouble code (DTC) specifically relates to a fault with the glow plug in cylinder 3 of a 2016 GMC Sierra. Glow plugs are crucial components in diesel engines that help with cold starts by heating up the combustion chamber. The glow plug offset exceeded learning limit indicates that the engine control module (ECM) has detected that the glow plug in cylinder 3 is operating outside the specified parameters for an extended period. This can lead to difficulties in starting the engine, decreased fuel efficiency, increased emissions, and potential engine misfires.

OBDII Code P133A 2016 GMC Sierra - Cylinder 3 Glow Plug Offset Exceeded Learning Limit
P133A 2016 GMC Sierra Code - Cylinder 3 Glow Plug Offset Exceeded Learning Limit

Common Causes of P133A 2016 GMC Sierra

  1. Faulty glow plug in cylinder 3
  2. Wiring issues or poor electrical connection to the glow plug
  3. ECM software glitches
  4. Engine temperature sensor malfunction
  5. Fuel quality issues affecting combustion

Symptoms of P133A 2016 GMC Sierra

  1. Difficulty starting the engine, especially in cold weather
  2. Rough idling or engine misfires
  3. Decreased fuel efficiency
  4. Check engine light illuminated on the dashboard
  5. Increased exhaust emissions

How to Fix P133A 2016 GMC Sierra

  1. Begin by diagnosing the specific glow plug in cylinder 3 to determine if it is faulty.
  2. Check the wiring and electrical connections to the glow plug for any damage or corrosion.
  3. Verify the engine temperature sensor's functionality and replace if necessary.
  4. Clear the DTC from the ECM memory and reset the system.
  5. Test drive the vehicle to ensure the issue has been resolved and the symptoms have disappeared.

Cost to Fix P133A 2016 GMC Sierra

The typical repair costs for addressing a P133A code in a 2016 GMC Sierra may range from $150 to $500, depending on the extent of the issue and the need for parts replacement. This estimate includes labor charges, which can vary based on the shop's hourly rates and the technician's expertise. It's advisable to consult with a trusted mechanic or dealership for a more accurate cost estimate tailored to your specific vehicle and location.

What does this mean?

Tech Notes for P133A 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 P133A 2016 GMC Sierra Code

1. What does the OBDII code P133A mean on a 2016 GMC Sierra?

P133A indicates that the glow plug offset for cylinder 3 has exceeded the learning limit, meaning the engine control module (ECM) has detected a performance issue with the glow plug system for that cylinder.

2. What are the common symptoms of code P133A on a GMC Sierra?

Symptoms may include difficulty starting the engine in cold weather, reduced engine performance, rough idling, or an illuminated check engine light.

3. What causes the P133A code to appear on a 2016 GMC Sierra?

Common causes include a faulty glow plug, poor electrical connections to the glow plug, a damaged glow plug control module, or carbon buildup affecting the glow plug's performance.

4. Can I drive my 2016 GMC Sierra with the P133A code?

While it may be possible to drive the vehicle, prolonged operation with this code can lead to starting difficulties in cold weather and potential long-term engine damage. Prompt diagnosis and repair are recommended.

5. How do I diagnose the P133A code on my GMC Sierra?

Start by inspecting the glow plug for cylinder 3, checking for electrical continuity and signs of wear. Verify the wiring and connections to the glow plug and test the glow plug control module for proper operation.

6. How do I fix the P133A code on my 2016 GMC Sierra?

Common fixes include replacing the faulty glow plug, cleaning or repairing any damaged wiring or connectors, or replacing the glow plug control module if it's not functioning correctly.

7. How much does it cost to repair the P133A code on a GMC Sierra?

The cost varies depending on the issue, but replacing a glow plug typically costs $100–$300, including labor. If the control module is faulty, the cost may be higher.

8. What tools are needed to diagnose and repair the P133A code?

You’ll need an OBDII scanner, a multimeter for electrical testing, and basic hand tools for removing and replacing the glow plug.

9. Is the P133A code specific to cylinder 3?

Yes, P133A specifically refers to an issue with the glow plug in cylinder 3. Similar codes may indicate problems with glow plugs in other cylinders.

10. Can a dirty or clogged glow plug cause the P133A code?

Yes, carbon buildup on the glow plug can reduce its effectiveness and trigger the P133A code. Cleaning or replacing the glow plug may resolve the issue.

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