B133B 2018 GMC Sierra 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 2018 GMC Sierra 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 2018 GMC Sierra Description
What are the Possible Causes of the DTC B133B 2018 GMC Sierra?
- 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 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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B133B 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 B133B 2018 GMC Sierra Code
1. What does the OBDII code B133B mean on a 2018 GMC Sierra?
The B133B code indicates an issue where the reverse gear status signal from the transmission control module (TCM) is not plausible or doesn’t match expected parameters.
2. What are the symptoms of the B133B code on a 2018 GMC Sierra?
Symptoms may include the reverse lights not activating, difficulty or failure to engage reverse gear, or a message or warning light on the dashboard.
3. What causes the B133B code to appear on a 2018 GMC Sierra?
Common causes include a faulty transmission range sensor, damaged wiring or connectors, a malfunctioning TCM, or software issues in the vehicle's control modules.
4. Can I drive my 2018 GMC Sierra with the B133B code?
While the vehicle may still be drivable, issues with reverse gear status could lead to safety concerns or further damage, so it’s recommended to address the issue promptly.
5. How do you diagnose the B133B code on a 2018 GMC Sierra?
Diagnosis involves using a scan tool to check for related codes, inspecting the transmission range sensor, and examining wiring and connectors for damage or loose connections.
6. How is the B133B code fixed on a 2018 GMC Sierra?
Repairs may include replacing a faulty transmission range sensor, repairing or replacing damaged wiring, reprogramming or updating the TCM, or replacing the TCM if necessary.
7. Is the B133B code covered under warranty for a 2018 GMC Sierra?
This depends on the vehicle's warranty terms and mileage; consult your GMC dealer to determine if it’s covered under the powertrain or emissions warranty.
8. What tools are needed to fix the B133B code on a 2018 GMC Sierra?
You’ll typically need a diagnostic scan tool, multimeter, and possibly specialized tools for accessing and replacing transmission-related components.
9. Can a software update fix the B133B code on my 2018 GMC Sierra?
In some cases, a software update for the TCM may resolve the issue if it’s caused by a programming error or glitch.
10. How much does it cost to fix the B133B code on a 2018 GMC Sierra?
Repair costs can vary depending on the root cause but may range from $100 for minor wiring repairs to $1,000+ if the TCM needs replacement.
Discuss the causes and fixes for B133B 2018 GMC Sierra OBDII Code
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