AutoCodes – Chevrolet – P133B 2018 Chevrolet Silverado

P133B 2018 Chevrolet Silverado Code - Cylinder 4 Glow Plug Offset Exceeded Learning Limit

Quick Answer

The Glow Plug Control Module has not learned the glow plug offset values. Common causes include Perform Glow Plug Learn procedure, Faulty Glow Plug 4, Glow Plug 4 harness is open or shorted. 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: P133B 2018 Chevrolet Silverado indicates Cylinder 4 Glow Plug Offset Exceeded Learning Limit.
Common causes: Common causes include Perform Glow Plug Learn procedure, Faulty Glow Plug 4, Glow Plug 4 harness is open or shorted.
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.

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Code Popularity 531

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 30, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P133B 2018 Chevrolet Silverado Description

The Glow Plug Control Module has not learned the glow plug offset values. If a glow plug has been replaced and the glow plug learn was not performed, or if the Glow Plug Control Module experiences an Electronically Erasable Programmable Read Only Memory (EEPROM) error or data corruption, this Diagnostic Trouble Code (DTC) to set. The DTC will be set if the glow plug hot resistance is outside a predefined threshold.

OBDII Code P133B 2018 Chevrolet Silverado - Cylinder 4 Glow Plug Offset Exceeded Learning Limit - AutoCodes.com — P133B 2018 Chevrolet Silverado Code - Cylinder 4 Glow Plug Offset Exceeded Learning Limit

What does this mean?

What are the Possible Causes of the DTC P133B 2018 Chevrolet Silverado?

Perform Glow Plug Learn procedure
Faulty Glow Plug 4
Glow Plug 4 harness is open or shorted
Glow Plug 4 circuit poor electrical connection

How to Fix the DTC P133B 2018 Chevrolet Silverado?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

If a Glow Plug was replaced, perform a Glow Plug Learn procedure with a Scan Tool.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P133B 2018 Chevrolet Silverado code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P133B 2018 Chevrolet Silverado code?

Need more information on how to fix the P133B 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 P133B 2018 Chevrolet Silverado Code

1. What does OBDII code P133B mean for a 2018 Chevrolet Silverado?

Code P133B indicates that the Cylinder 4 glow plug offset has exceeded the learning limit, suggesting an issue with the glow plug system specific to cylinder 4.

2. What are the symptoms of code P133B in a 2018 Chevrolet Silverado?

Common symptoms include difficulty starting in cold weather, rough idling, poor fuel efficiency, and the check engine light being illuminated.

3. What causes code P133B in a Chevrolet Silverado?

The most common causes are a faulty glow plug in cylinder 4, wiring or connector issues, a malfunctioning glow plug control module, or carbon buildup around the glow plug.

4. How can I diagnose code P133B in my Silverado?

Start by inspecting the cylinder 4 glow plug and its wiring for damage or corrosion. Then, test the resistance of the glow plug and check the function of the glow plug control module.

5. Can I drive my 2018 Chevrolet Silverado with code P133B?

While it may still be drivable, ignoring this code can lead to harder starts in cold weather, reduced engine performance, and potential engine damage over time.

6. How do I fix code P133B in a Chevrolet Silverado?

Repairs may include replacing the cylinder 4 glow plug, cleaning or repairing the wiring harness, or replacing the glow plug control module if necessary.

7. How much does it cost to fix code P133B in a 2018 Silverado?

The cost can vary, but replacing a single glow plug typically ranges from $100 to $300, including parts and labor. Wiring or module repairs may increase the cost.

8. Can a bad glow plug cause long-term damage to my Silverado?

Yes, a faulty glow plug can lead to incomplete combustion, increased emissions, and potential damage to the diesel particulate filter (DPF) or other engine components.

9. How can I prevent code P133B from occurring again?

Regular maintenance, such as inspecting the glow plug system and addressing issues promptly, can help prevent this code. Using high-quality diesel fuel can also reduce carbon buildup.

10. Does code P133B require a professional mechanic to fix?

If you have experience with automotive repairs, you might be able to replace the glow plug or repair wiring yourself. However, professional diagnosis and repair are recommended to ensure the issue is fully resolved.