B133B GMC Code - Reverse Gear Status Not Plausible
Quick Answer
The Human Machine Interface Control Module receives a signal from the Human Machine Interface Control Module Bypass Module indicating reverse gear status. Common causes include Faulty Body Control Module (BCM), Body Control Module harness is open or shorted, Body Control Module circuit poor electrical connection. 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
- B133B GMC indicates Reverse Gear Status Not Plausible.
- Common causes
- Common causes include Faulty Body Control Module (BCM), Body Control Module harness is open or shorted, Body Control Module circuit poor electrical connection.
- 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 B133B GMC Description
What are the Possible Causes of the DTC B133B GMC?
- Faulty Body Control Module (BCM)
- Body Control Module harness is open or shorted
- Body Control Module circuit poor electrical connection
- Faulty Human Machine Interface Control Module
How to Fix the DTC B133B GMC?
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 is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B133B GMC 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 B133B GMC code?
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Information for Specific GMC Models
- B133B 2014 GMC Sierra — Reverse Gear Status Not Plausible
- B133B 2015 GMC Sierra — Reverse Gear Status Not Plausible
- B133B 2016 GMC Sierra — Reverse Gear Status Not Plausible
- B133B 2017 GMC Sierra — Reverse Gear Status Not Plausible
- B133B 2018 GMC Sierra — Reverse Gear Status Not Plausible
Frequently Asked Questions about B133B GMC Code
What does the OBDII code B133B mean for GMC vehicles?
The code B133B indicates that the reverse gear status is not plausible, meaning the vehicle's control module detects an issue with the reverse gear signal or its operation.
What are common symptoms of the B133B code in GMC vehicles?
Symptoms may include reverse gear not engaging, reverse lights failing to illuminate, or erratic transmission behavior.
What causes the B133B code to appear?
The code can be triggered by a faulty transmission range sensor, wiring issues, poor electrical connections, or problems with the transmission control module.
How can you diagnose the B133B code?
Start by inspecting the transmission range sensor, checking wiring and connectors for damage, and using a scan tool to monitor the reverse gear signal.
Can a damaged transmission range sensor cause the B133B code?
Yes, a malfunctioning transmission range sensor is one of the most common causes of this code.
Is the B133B code related to the reverse lights?
Yes, issues with the reverse gear signal can prevent the reverse lights from activating.
Can you drive with the B133B code active?
Driving with this code may compromise reverse gear functionality, potentially causing inconvenience or safety risks.
What tools are needed to troubleshoot the B133B code?
You’ll need a scan tool capable of reading GMC-specific codes, a multimeter for testing electrical connections, and possibly a repair manual for wiring diagrams.
How can the B133B code be fixed?
Repairs may involve replacing the transmission range sensor, repairing damaged wiring, or addressing issues in the transmission control module.
Does clearing the B133B code solve the problem?
Clearing the code may temporarily remove it, but the underlying issue must be repaired to prevent the code from returning.
Discuss the causes and fixes for B133B GMC OBDII Code
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