P133F 2018 GMC Sierra Code - Cylinder 8 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 8, Glow Plug 8 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
- P133F 2018 GMC Sierra indicates Cylinder 8 Glow Plug Offset Exceeded Learning Limit.
- Common causes
- Common causes include Perform Glow Plug Learn procedure, Faulty Glow Plug 8, Glow Plug 8 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 P133F 2018 GMC Sierra Description
What are the Possible Causes of the DTC P133F 2018 GMC Sierra?
- Perform Glow Plug Learn procedure
- Faulty Glow Plug 8
- Glow Plug 8 harness is open or shorted
- Glow Plug 8 circuit poor electrical connection
How to Fix the DTC P133F 2018 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 P133F 2018 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 P133F 2018 GMC Sierra Code
What does OBDII code P133F mean on a 2018 GMC Sierra?
P133F indicates that the Cylinder 8 Glow Plug Offset has exceeded its learning limit, meaning the ECM has detected an issue with the glow plug system calibration for cylinder 8.
What are the symptoms of code P133F in a 2018 GMC Sierra?
Symptoms may include a check engine light, rough starting in cold weather, reduced engine performance, or noticeable misfires.
What causes the P133F code on a 2018 GMC Sierra?
Common causes include a faulty glow plug, damaged glow plug control module, wiring issues, or incorrect calibration of the glow plug system.
Can I drive my 2018 GMC Sierra with the P133F code?
While the vehicle may still be drivable, prolonged operation with this code can lead to starting problems, decreased performance, and potential damage to the engine.
How do I fix the P133F code on my 2018 GMC Sierra?
Repairs may involve replacing the faulty glow plug for cylinder 8, inspecting and repairing wiring or connectors, or recalibrating the glow plug system using a scan tool.
How can a faulty glow plug cause the P133F code?
A faulty glow plug may fail to achieve the required temperature for proper combustion in cylinder 8, triggering the offset limit error in the ECM.
Can a damaged glow plug control module cause the P133F code?
Yes, if the glow plug control module is malfunctioning, it may not properly regulate the glow plug's operation, leading to the offset error.
How do I diagnose the P133F code on a 2018 GMC Sierra?
Use a scan tool to confirm the code and check freeze frame data, then inspect the glow plug, wiring, and control module for cylinder 8 for signs of damage or failure.
Is the P133F code specific to cylinder 8?
Yes, this code specifically refers to the glow plug system for cylinder 8 and indicates that its offset exceeds the learning limit set by the ECM.
Will clearing the P133F code fix the issue?
Clearing the code may temporarily remove the check engine light, but the underlying issue must be repaired to prevent the code from returning.
Discuss the causes and fixes for P133F 2018 GMC Sierra OBDII Code
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