AutoCodes – GMC – B051B GMC

B051B GMC 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 GMC 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 1,325

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

What does this mean?

What are the Possible Causes of the DTC B051B GMC?

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 GMC?

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 GMC 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.

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Information for Specific GMC Models

B051B 2014 GMC Sierra — Right Side Assist Step Motor Control Circuit
B051B 2015 GMC Sierra — Right Side Assist Step Motor Control Circuit
B051B 2016 GMC Sierra — Right Side Assist Step Motor Control Circuit
B051B 2017 GMC Sierra — Right Side Assist Step Motor Control Circuit
B051B 2018 GMC Sierra — Right Side Assist Step Motor Control Circuit

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 GMC Code

1. What are the common symptoms of OBDII code B051B GMC?

- The common symptoms include malfunctioning or inoperative right-side assist step motor, difficulty deploying or retracting the step, and potential warning lights on the dashboard.

2. What can cause the Right Side Assist Step Motor Control Circuit malfunction?

- Possible causes of the B051B code include damaged wiring or connectors, a faulty assist step motor, issues with the control module, or a software glitch.

3. How can I diagnose the issue related to code B051B GMC?

- To diagnose the problem, you can use an OBDII scanner to retrieve the code, visually inspect the wiring and connectors, check the assist step motor functionality, and perform a thorough system scan.

4. Are there any simple repairs I can try to fix the B051B code issue?

- You can start by checking and repairing any damaged wiring or connectors, ensuring proper connections, and resetting the system to see if the issue resolves. However, more complex repairs may require professional assistance.

5. Can a DIY enthusiast without much experience fix the Right Side Assist Step Motor Control Circuit problem?

- While some basic troubleshooting steps can be performed by a DIY enthusiast, complex repairs involving component replacement or module reprogramming are best left to experienced professionals to ensure proper resolution.

6. Is it safe to continue driving my GMC with the B051B code present?

- It is not recommended to continue driving the vehicle with the B051B code present, as it may indicate potential safety issues related to the right-side assist step motor, affecting passenger entry and exit.

7. How much does it typically cost to repair the Right Side Assist Step Motor Control Circuit issue?

- The cost of repair can vary depending on the specific cause of the problem. Simple fixes like repairing wiring may be relatively inexpensive, while replacing the assist step motor or control module can be more costly.

8. Will resetting the OBDII code B051B make the problem go away permanently?

- Simply resetting the code may temporarily clear the warning lights, but if the underlying issue causing the B051B code is not addressed and fixed, the problem is likely to reoccur.

9. Can extreme weather conditions affect the Right Side Assist Step Motor Control Circuit?

- Extreme weather conditions, such as excessive heat or moisture, can potentially damage the wiring, connectors, or motor components related to the right-side assist step, leading to issues with the circuit.

10. How can I prevent future occurrences of the B051B GMC code?

- Regular maintenance checks, inspecting the assist step system for signs of wear or damage, and addressing any issues promptly can help prevent future instances of the B051B code from occurring.