P133B 2014 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 2014 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 2014 GMC Sierra Description
What are the Possible Causes of the DTC P133B 2014 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 2014 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 2014 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 2014 GMC Sierra Code
What does the OBDII code P133B mean on a 2014 GMC Sierra?
The P133B code indicates that the glow plug offset for cylinder 4 has exceeded the learning limit, meaning the glow plug system is not functioning within the expected range for that cylinder.
What are the common symptoms of the P133B code?
Common symptoms include a check engine light, rough cold starts, decreased fuel efficiency, and potential misfiring in cylinder 4.
What causes the P133B code to appear?
The code is typically caused by a faulty glow plug in cylinder 4, wiring issues, a failing glow plug control module, or carbon build-up around the glow plug.
Can I drive my 2014 GMC Sierra with the P133B code?
While the truck may still run, driving with this code can lead to poor performance, harder cold starts, and potential damage to the engine if not addressed promptly.
How do you diagnose the P133B code?
Diagnosis involves scanning the vehicle with an OBDII tool, testing the resistance of the cylinder 4 glow plug, inspecting the wiring and connectors, and checking the glow plug control module.
How do you fix the P133B code?
Common fixes include replacing the cylinder 4 glow plug, cleaning or replacing damaged wiring, and, in some cases, replacing the glow plug control module.
What tools do I need to repair a P133B code?
You’ll need an OBDII scanner, a multimeter to test electrical resistance, and basic tools to replace the glow plug or repair wiring.
Does the P133B code always mean the glow plug is bad?
No, it can also indicate issues with the wiring, control module, or excessive carbon build-up around the glow plug.
How much does it cost to fix the P133B code?
Replacing a glow plug typically costs $100–$300, depending on parts and labor. Additional costs may apply if wiring or control module repairs are needed.
Can a P133B code cause long-term damage if not fixed?
Yes, ignoring this code can lead to harder cold starts, reduced engine efficiency, and potential damage to other engine components over time.
Discuss the causes and fixes for P133B 2014 GMC Sierra OBDII Code
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