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Engine-Codes – GMC – B133B 2016 GMC Sierra

B133B 2016 GMC Sierra Code - Reverse Gear Status Not Plausible

Quick Answer

The B133B diagnostic trouble code (DTC) in a 2016 GMC Sierra indicates that the reverse gear status is not plausible. Common causes include Faulty reverse gear position sensor, Damaged wiring harness or loose connections, TCM software glitches or internal faults. 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 2016 GMC Sierra indicates Reverse Gear Status Not Plausible.
Common causes
Common causes include Faulty reverse gear position sensor, Damaged wiring harness or loose connections, TCM software glitches or internal faults.
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 10, 2024
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Code B133B 2016 GMC Sierra Description

The B133B diagnostic trouble code (DTC) in a 2016 GMC Sierra indicates that the reverse gear status is not plausible. This means that the vehicle's onboard computer has detected an issue with the reverse gear position sensor or its signal, leading to an inconsistency between the gear selected by the driver and the gear reported by the vehicle's transmission control module (TCM). This discrepancy can cause a variety of problems, such as difficulty engaging or disengaging the reverse gear, erratic shifting behavior, or even a complete loss of reverse gear function.

OBDII Code B133B 2016 GMC Sierra - Reverse Gear Status Not Plausible
B133B 2016 GMC Sierra Code - Reverse Gear Status Not Plausible

Common Causes of B133B 2016 GMC Sierra

  1. Faulty reverse gear position sensor
  2. Damaged wiring harness or loose connections
  3. TCM software glitches or internal faults
  4. Transmission fluid contamination or low fluid level
  5. Mechanical issues with the transmission components

Symptoms of B133B 2016 GMC Sierra

  1. Difficulty engaging or disengaging the reverse gear
  2. Erratic shifting behavior, such as harsh or delayed gear changes
  3. Loss of reverse gear function
  4. Illumination of the check engine light
  5. Transmission slipping or overheating

How to Fix B133B 2016 GMC Sierra

  1. Perform a thorough diagnosis using a scan tool to determine the exact cause of the issue.
  2. Inspect the reverse gear position sensor and its wiring harness for any signs of damage or corrosion.
  3. Test the sensor's output signal and verify its accuracy.
  4. Replace the reverse gear position sensor if it is found to be faulty.
  5. Clear the DTC and test drive the vehicle to confirm that the issue has been resolved.

Cost to Fix B133B 2016 GMC Sierra

The typical repair costs for addressing a B133B code in a 2016 GMC Sierra can range from $200 to $500, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's recommended to check with local repair shops for a more accurate estimate. Keep in mind that rates at dealerships or in metropolitan areas may be higher, while independent shops often offer more competitive pricing.

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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 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code B133B on a 2016 GMC Sierra?

The common symptoms may include issues with shifting into reverse gear, erratic behavior in reverse, or the reverse gear not engaging properly.

2. What does the OBDII code B133B mean for a 2016 GMC Sierra?

The code B133B indicates a "Reverse Gear Status Not Plausible" error, suggesting a problem with the reverse gear functionality in the vehicle.

3. What are the possible causes of OBDII code B133B on a 2016 GMC Sierra?

Possible causes may include faulty transmission sensors, wiring issues, a malfunctioning transmission control module, or mechanical problems within the transmission system.

4. How can I diagnose the OBDII code B133B on my 2016 GMC Sierra?

Diagnosis typically involves using an OBDII scanner to retrieve the code, inspecting the transmission sensors and wiring, checking the transmission fluid level, and performing a thorough visual inspection of the transmission components.

5. Can I continue driving my 2016 GMC Sierra with the OBDII code B133B?

It is not recommended to drive the vehicle with this code present, as it may lead to further transmission damage or safety hazards due to potential issues with reverse gear engagement.

6. How can I reset the OBDII code B133B on my 2016 GMC Sierra?

Resetting the code typically involves using an OBDII scanner to clear the error code after identifying and addressing the root cause of the issue.

7. Is it safe to attempt DIY repairs for the OBDII code B133B on a 2016 GMC Sierra?

While some basic checks like inspecting wiring connections can be done by DIY enthusiasts, complex transmission repairs should be handled by experienced professionals to ensure proper diagnosis and repair.

8. What are the repair options for addressing OBDII code B133B on a 2016 GMC Sierra?

Repair options may include replacing faulty sensors, repairing damaged wiring, recalibrating the transmission control module, or conducting necessary transmission repairs as per the diagnosis.

9. How much does it typically cost to fix the OBDII code B133B on a 2016 GMC Sierra?

The cost of repairs can vary depending on the specific underlying issue, parts needed for replacement, labor costs, and whether the repairs are done at a dealership or an independent repair shop.

10. Can weather conditions affect the occurrence of OBDII code B133B on a 2016 GMC Sierra?

Extreme weather conditions like temperature fluctuations or moisture exposure may potentially impact the transmission system and contribute to the occurrence of the reverse gear error indicated by code B133B.

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