AutoCodes – GMC – B133B 2014 GMC Sierra

B133B 2014 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 2014 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 256

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Dec 12, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B133B 2014 GMC Sierra Description

The Human Machine Interface Control Module receives a signal from the Human Machine Interface Control Module Bypass Module indicating reverse gear status. The reverse gear status is used to determine when to activate the rearview camera display. The Human Machine Interface Control Module also receives another reverse gear status message via serial data. The Human Machine Interface Control Module compares the two serial data messages to verify the plausibility of the messages. The Diagnostic Trouble Code (DTC) will be set when the Human Machine Interface Control Module has determined the reverse message states do not match and are therefore not plausible.

OBDII Code B133B 2014 GMC Sierra - Reverse Gear Status Not Plausible - AutoCodes.com — B133B 2014 GMC Sierra Code - Reverse Gear Status Not Plausible

What does this mean?

What are the Possible Causes of the DTC B133B 2014 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 2014 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 2014 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.

Need more information about the B133B 2014 GMC Sierra code?

Need more information on how to fix the B133B 2014 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B133B 2014 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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.