AutoCodes – GMC – B051B 2017 GMC Sierra

B051B 2017 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 2017 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.

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Code Popularity 285

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
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Code B051B 2017 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 2017 GMC Sierra - Right Side Assist Step Motor Control Circuit - AutoCodes.com — B051B 2017 GMC Sierra Code - Right Side Assist Step Motor Control Circuit

What does this mean?

What are the Possible Causes of the DTC B051B 2017 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 2017 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 2017 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 2017 GMC Sierra code?

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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 B051B 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code B051B in a 2017 GMC Sierra related to the Right Side Assist Step Motor Control Circuit?

The common symptoms include the right side assist step not deploying or retracting properly, or the assist step getting stuck in one position.

2. What are the possible causes of the Right Side Assist Step Motor Control Circuit issue in a 2017 GMC Sierra?

Possible causes include a malfunctioning assist step motor, wiring issues, a faulty control module, or a blown fuse related to the assist step system.

3. How can I diagnose the OBDII code B051B in my 2017 GMC Sierra?

Diagnosis typically involves using a scan tool to read the trouble code, inspecting the wiring and connections of the assist step system, and testing the assist step motor and control module for proper operation.

4. Is it safe to drive my 2017 GMC Sierra with the B051B code related to the Right Side Assist Step Motor Control Circuit?

It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to ensure the proper functioning of the assist step system.

5. Can I repair the Right Side Assist Step Motor Control Circuit issue in my 2017 GMC Sierra myself?

Depending on your level of automotive expertise, you may be able to repair the issue yourself by replacing the faulty motor, repairing wiring issues, or replacing the control module. However, professional diagnosis and repair are recommended for complex electrical issues.

6. How much does it typically cost to repair the B051B code in a 2017 GMC Sierra?

The cost of repair can vary depending on the specific cause of the issue. Replacing a malfunctioning motor or control module may cost a few hundred dollars, while addressing wiring issues could be less expensive.

7. Can a faulty battery or alternator cause the B051B code to appear in a 2017 GMC Sierra?

While a weak battery or alternator can potentially cause electrical issues, the B051B code specifically relates to the Right Side Assist Step Motor Control Circuit and is more likely due to issues within that system.

8. Will resetting the OBDII code B051B in my 2017 GMC Sierra make the problem go away permanently?

Resetting the code may temporarily clear the warning light, but if the underlying issue causing the code is not addressed, the problem is likely to reoccur.

9. How can I prevent future occurrences of the B051B code in my 2017 GMC Sierra?

Regularly inspecting and maintaining the assist step system, ensuring proper wiring connections, and addressing any issues promptly can help prevent the reoccurrence of the B051B code.

10. Is the OBDII code B051B specific to GMC Sierra models, or can it occur in other vehicles?

The B051B code related to the Right Side Assist Step Motor Control Circuit is specific to GMC Sierra models with similar assist step systems. Other vehicles may have different codes for similar issues.