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Engine-Codes – GMC – B133B 2018 GMC Sierra

B133B 2018 GMC Sierra Code - Reverse Gear Status Not Plausible

Quick Answer

The B133B diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates that the reverse gear status is not plausible. Common causes include Faulty transmission position sensor, Wiring issues or shorts in the transmission control circuit, Malfunctioning transmission control module (TCM). 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 transmission position sensor, Wiring issues or shorts in the transmission control circuit, Malfunctioning transmission control module (TCM).
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code B133B 2018 GMC Sierra Description

The B133B diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates that the reverse gear status is not plausible. Essentially, this means that the transmission control module (TCM) is receiving conflicting or inaccurate signals regarding the position of the transmission when the vehicle is in reverse. This can lead to a variety of issues with the vehicle's drivability, safety, and overall performance.

OBDII Code B133B 2018 GMC Sierra - Reverse Gear Status Not Plausible
B133B 2018 GMC Sierra Code - Reverse Gear Status Not Plausible

Common Causes of B133B 2018 GMC Sierra

  1. Faulty transmission position sensor
  2. Wiring issues or shorts in the transmission control circuit
  3. Malfunctioning transmission control module (TCM)
  4. Mechanical issues with the transmission linkage
  5. Low transmission fluid levels or dirty transmission fluid

Symptoms of B133B 2018 GMC Sierra

  1. Hesitation or jerking when shifting into reverse
  2. Inability to engage reverse gear
  3. Dashboard warning light indicating transmission issue
  4. Grinding or clunking noises when shifting into reverse

How to Fix B133B 2018 GMC Sierra

  1. Begin by conducting a thorough diagnostic scan to retrieve the B133B code and identify the specific cause of the issue.
  2. Inspect the transmission position sensor and wiring for any signs of damage or wear. Replace any faulty components as needed.
  3. Check the transmission control module (TCM) for proper functionality and recalibrate if necessary. Replace the TCM if it is malfunctioning.
  4. Inspect the transmission linkage for any mechanical issues that may be causing the incorrect transmission position readings. Repair or replace any damaged components.
  5. Finally, clear the DTC from the TCM memory and test the vehicle to ensure that the issue has been resolved.

Cost to Fix B133B 2018 GMC Sierra

The cost of repairing a B133B DTC on a 2018 GMC Sierra can vary depending on the specific cause of the issue and the labor rates in your area. Typically, the cost of parts for this repair can range from $100 to $500, with labor costs adding an additional $100 to $300. Overall, you can expect to pay anywhere from $200 to $800 for this repair, but it is advisable to consult with a trusted mechanic or dealership for a more accurate estimate based on your location and vehicle specifics. Labor rates at auto repair shops typically range from $80 to $150 per hour, but rates may vary based on the area and the shop's expertise.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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.

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