AutoCodes – GMC – B051B 2015 GMC Sierra

B051B 2015 GMC Sierra Code - Right Side Assist Step Motor Control Circuit

Quick Answer

The Assist Step Control (ASC) Module controls the running board actuators to extend or retract the running boards. Common causes include Faulty Right Side Assist Step Motor, Right Side Assist Step Motor harness is open or shorted, Right Side Assist Step Motor circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: B051B 2015 GMC Sierra indicates Right Side Assist Step Motor Control Circuit.
Common causes: Common causes include Faulty Right Side Assist Step Motor, Right Side Assist Step Motor harness is open or shorted, Right Side Assist Step Motor circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

Save to My Repairs My Repairs

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

Code Popularity 208

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 13, 2022

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

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

Code B051B 2015 GMC Sierra Description

The Assist Step Control (ASC) Module controls the running board actuators to extend or retract the running boards. Each actuator consists of an electric motor and a potentiometer. The module supplies a low reference and 10-volt reference source voltage to the potentiometer. The ASC control module monitors the voltage drop across the potentiometer on the position signal circuit. When the actuator shaft rotates, the voltage on the position signal circuit changes. The ASC control module supplies the actuator motor with a 12-volt control circuit and a ground control circuit. The ASC module controls the direction of the actuator by changing the polarity of the control circuits.

OBDII Code B051B 2015 GMC Sierra - Right Side Assist Step Motor Control Circuit - AutoCodes.com — B051B 2015 GMC Sierra Code - Right Side Assist Step Motor Control Circuit

What does this mean?

What are the Possible Causes of the DTC B051B 2015 GMC Sierra?

Faulty Right Side Assist Step Motor
Right Side Assist Step Motor harness is open or shorted
Right Side Assist Step Motor circuit poor electrical connection
Faulty Assist Step Control (ASC) Module

How to Fix the DTC B051B 2015 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 does this mean?

Code Tech Notes

B051B:0B Right Side Assist Step Motor Control Circuit Current Above Threshold
B051B:01 Right Side Assist Step Motor Control Circuit Short to Battery
B051B:02 Right Side Assist Step Motor Control Circuit Short to Ground
B051B:04 Right Side Assist Step Motor Control Circuit Open Circuit

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B051B 2015 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 B051B 2015 GMC Sierra code?

Need more information on how to fix the B051B 2015 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B051B 2015 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 B051B 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code B051B in a 2015 GMC Sierra related to the Right Side Assist Step Motor Control Circuit?

- Common symptoms include a non-operational right side assist step, difficulty in deploying or retracting the step, or a warning light on the dashboard.

2. What are the possible causes of OBDII code B051B in a 2015 GMC Sierra?

- Possible causes include a faulty assist step motor, damaged wiring or connectors in the control circuit, or a malfunctioning control module.

3. How can I diagnose the issue related to the Right Side Assist Step Motor Control Circuit in a 2015 GMC Sierra?

- Diagnosis involves using a scan tool to retrieve the specific trouble code, inspecting the wiring and connectors for damage, and testing the assist step motor for proper functionality.

4. Can I still drive my 2015 GMC Sierra with OBDII code B051B active?

- It is generally safe to drive the vehicle with this code, but the right side assist step may not function correctly, potentially causing inconvenience or safety concerns.

5. How can I reset or clear OBDII code B051B in a 2015 GMC Sierra?

- The code can be cleared using an OBDII scan tool that has the capability to reset trouble codes. However, it is recommended to diagnose and repair the underlying issue first.

6. Is it possible to repair OBDII code B051B in a 2015 GMC Sierra without professional help?

- Depending on your automotive repair skills, it may be possible to repair the issue yourself by following diagnostic procedures and replacing faulty components like the assist step motor or damaged wiring.

7. What are some repair tips for resolving OBDII code B051B in a 2015 GMC Sierra?

- Repair tips include checking for loose or damaged wiring, ensuring proper connection of electrical connectors, and consulting the vehicle's service manual for specific troubleshooting steps.

8. Can extreme weather conditions affect the operation of the Right Side Assist Step Motor Control Circuit in a 2015 GMC Sierra?

- Yes, extreme cold or moisture can impact the functionality of the assist step motor and its control circuit, potentially leading to issues related to OBDII code B051B.

9. How much does it typically cost to repair OBDII code B051B in a 2015 GMC Sierra at a professional auto repair shop?

- Repair costs can vary depending on the exact cause of the issue, but it may involve expenses for parts replacement, labor, and diagnostic fees, which could range from a few hundred to over a thousand dollars.

10. Are there any recalls or technical service bulletins related to OBDII code B051B in a 2015 GMC Sierra?

- It is advisable to check with the manufacturer or authorized dealerships for any relevant recalls or technical service bulletins concerning the Right Side Assist Step Motor Control Circuit issue in a 2015 GMC Sierra.