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Engine-Codes – GMC – B133B 2014 GMC Sierra

B133B 2014 GMC Sierra Code - Reverse Gear Status Not Plausible

Quick Answer

The B133B diagnostic trouble code (DTC) on a 2014 GMC Sierra indicates that the reverse gear status is not plausible, meaning that there is a discrepancy between the expected position of the transmission gear selector in reverse and the actual gear engagement. Common causes include Faulty transmission solenoids, Damaged wiring harnesses or connectors, Malfunctioning 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 2014 GMC Sierra indicates Reverse Gear Status Not Plausible.
Common causes
Common causes include Faulty transmission solenoids, Damaged wiring harnesses or connectors, Malfunctioning 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 11, 2024
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Code B133B 2014 GMC Sierra Description

The B133B diagnostic trouble code (DTC) on a 2014 GMC Sierra indicates that the reverse gear status is not plausible, meaning that there is a discrepancy between the expected position of the transmission gear selector in reverse and the actual gear engagement. This can lead to issues with the vehicle's transmission system, affecting its performance and drivability. The transmission control module (TCM) in the vehicle monitors the gear shift position and expects the transmission to engage in reverse when the gear selector is in that position. When the TCM detects that the reverse gear is not engaged as expected, it triggers the B133B code.

OBDII Code B133B 2014 GMC Sierra - Reverse Gear Status Not Plausible
B133B 2014 GMC Sierra Code - Reverse Gear Status Not Plausible

Common Causes of B133B 2014 GMC Sierra

  1. Faulty transmission solenoids
  2. Damaged wiring harnesses or connectors
  3. Malfunctioning TCM
  4. Internal transmission issues such as worn gears or clutches
  5. Low transmission fluid level or contaminated fluid

Symptoms of B133B 2014 GMC Sierra

  1. Difficulty engaging or shifting into reverse gear
  2. Inaccurate gear position displayed on the dashboard
  3. Transmission slipping or jerking while driving
  4. Illumination of the Check Engine Light
  5. Reduced fuel efficiency due to transmission inefficiency

How to Fix B133B 2014 GMC Sierra

  1. Perform a comprehensive diagnostic scan using a professional OBD-II scanner to retrieve the B133B code and identify the specific cause of the issue.
  2. Inspect the transmission solenoids, wiring harnesses, and connectors for any signs of damage or corrosion. Replace or repair as necessary.
  3. Check the transmission fluid level and condition. Top up or replace the fluid if needed.
  4. Test the TCM for proper functionality and reprogram if required.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix B133B 2014 GMC Sierra

The typical repair costs for addressing a B133B code on a 2014 GMC Sierra can range from $200 to $800, depending on the specific cause of the issue and the extent of repairs needed. This estimate includes parts and labor costs. It is important to note that the actual repair expenses can vary based on factors such as the location of the auto repair shop, the make and model of the vehicle, and the type of engine. Diagnostic time and labor rates at auto repair shops typically range from $80 to $150 per hour. It is advisable to obtain quotes from local service providers for a more accurate cost estimate.

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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 2014 GMC Sierra Code

1. What does the OBDII code B133B mean on a 2014 GMC Sierra?

The code B133B indicates a fault related to the "Reverse Gear Status Not Plausible," meaning the vehicle's system is detecting an issue with reverse gear engagement or its related sensors.

2. What are the common symptoms of code B133B in a 2014 GMC Sierra?

Symptoms may include the reverse lights not activating, difficulty engaging reverse gear, or the reverse camera not functioning properly.

3. What causes the B133B code to appear?

Common causes include a faulty transmission range sensor, issues with the reverse light circuit, damaged wiring, or problems in the body control module (BCM).

4. Can code B133B cause drivability issues in my 2014 GMC Sierra?

It typically does not cause major drivability issues, but it can affect reverse gear functionality and related systems like the reverse camera or parking sensors.

5. How is the B133B code diagnosed?

A mechanic will use a scan tool to confirm the code, inspect the transmission range sensor, check for loose or damaged wiring, and test the reverse light circuit.

6. Can I still drive my 2014 GMC Sierra with code B133B?

Yes, you can usually drive the vehicle, but reverse-related systems may not function correctly, so caution should be exercised when reversing.

7. How do I fix the B133B code on my GMC Sierra?

Repairs may include replacing a faulty transmission range sensor, repairing or replacing damaged wiring, or reprogramming the body control module.

8. Is the B133B code covered under warranty for a 2014 GMC Sierra?

It depends on the warranty coverage. Check with your dealership to see if the transmission or electronic components are still under warranty.

9. How much does it cost to fix code B133B?

The repair cost varies but typically ranges from $150 to $500, depending on whether it involves sensor replacement, wiring repair, or BCM reprogramming.

10. Can I clear the B133B code myself?

You can clear the code using an OBDII scanner, but if the issue is not resolved, the code will likely return. Proper diagnosis and repair are recommended.

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