P133B 2016 GMC Sierra 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 2016 GMC Sierra 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.
Code P133B 2016 GMC Sierra Description
What are the Possible Causes of the DTC P133B 2016 GMC Sierra?
- 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 2016 GMC Sierra?
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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P133B 2016 GMC Sierra 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.
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Frequently Asked Questions about P133B 2016 GMC Sierra Code
What does the OBDII code P133B mean on a 2016 GMC Sierra?
P133B indicates that the Cylinder 4 glow plug offset has exceeded its learning limit, often pointing to an issue with the glow plug or its control circuit.
What are the symptoms of code P133B on a 2016 GMC Sierra?
Symptoms may include difficulty starting the engine in cold weather, poor engine performance, increased emissions, or the Check Engine Light being illuminated.
What causes the P133B code to appear?
Common causes include a faulty glow plug, damaged glow plug wiring or connectors, malfunctioning glow plug control module, or excessive carbon buildup in the cylinder.
Can I drive my 2016 GMC Sierra with the P133B code active?
While the vehicle may still be drivable, prolonged use can lead to starting issues, poor performance, and potential damage to other engine components. Prompt diagnosis and repair are recommended.
How do I diagnose the P133B code on my truck?
Diagnosis typically involves checking the glow plug and its wiring for damage, testing the glow plug control circuit, and inspecting for carbon buildup in Cylinder 4.
How do I fix the P133B code on a 2016 GMC Sierra?
Repairs may include replacing the faulty glow plug, repairing damaged wiring or connectors, cleaning carbon deposits, or replacing the glow plug control module if necessary.
What tools are needed to troubleshoot the P133B code?
You’ll need an OBDII scanner, a multimeter for testing electrical circuits, and possibly a glow plug removal tool for further inspection or replacement.
How much does it cost to fix the P133B code?
The cost varies depending on the repair. Replacing a glow plug typically costs $100–$200, while more extensive repairs like addressing wiring or control module issues may cost more.
Can a dirty fuel system cause the P133B code?
While unlikely, a dirty fuel system can contribute to poor combustion, which might exacerbate issues related to glow plug performance, so it’s worth inspecting.
How can I prevent the P133B code from reoccurring?
Regular maintenance, including periodic inspection of glow plugs and their wiring, cleaning carbon buildup, and using high-quality fuel, can help prevent this code from returning.
Discuss the causes and fixes for P133B 2016 GMC Sierra OBDII Code
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