AutoCodes – GMC – B051A 2015 GMC Sierra

B051A 2015 GMC Sierra Code - Left 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 Left Side Assist Step Motor, Left Side Assist Step Motor harness is open or shorted, Left 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: B051A 2015 GMC Sierra indicates Left Side Assist Step Motor Control Circuit.
Common causes: Common causes include Faulty Left Side Assist Step Motor, Left Side Assist Step Motor harness is open or shorted, Left 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 185

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 B051A 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 B051A 2015 GMC Sierra - Left Side Assist Step Motor Control Circuit - AutoCodes.com — B051A 2015 GMC Sierra Code - Left Side Assist Step Motor Control Circuit

What does this mean?

What are the Possible Causes of the DTC B051A 2015 GMC Sierra?

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

How to Fix the DTC B051A 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

B051A:0B Left Side Assist Step Motor Control Circuit Current Above Threshold
B051A:01 Left Side Assist Step Motor Control Circuit Short to Battery
B051A:02 Left Side Assist Step Motor Control Circuit Short to Ground
B051A:04 Left Side Assist Step Motor Control Circuit Open Circuit

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B051A 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.

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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 B051A 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code B051A in a 2015 GMC Sierra related to the Left Side Assist Step Motor Control Circuit?

- Common symptoms include the left side assist step not deploying or retracting properly, intermittent operation of the assist step, or complete failure of the assist step to function.

2. What are the possible causes of OBDII code B051A in a 2015 GMC Sierra?

- The code B051A can be triggered by issues such as a faulty left side assist step motor, damaged wiring or connectors in the control circuit, or a malfunction in the assist step control module.

3. How can I diagnose the OBDII code B051A in my 2015 GMC Sierra?

- Diagnosis involves using a compatible OBDII scanner to retrieve the specific error code, inspecting the left side assist step motor and its connections for any visible damage, and testing the control circuit for continuity and proper voltage.

4. Can I still drive my 2015 GMC Sierra with the OBDII code B051A present?

- It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to avoid potential inconvenience or safety concerns related to the malfunctioning left side assist step.

5. What are the repair options for fixing OBDII code B051A in a 2015 GMC Sierra?

- Repair options may include replacing the left side assist step motor, repairing or replacing damaged wiring or connectors in the control circuit, or reprogramming the assist step control module to resolve the issue.

6. Is it possible to reset the OBDII code B051A in my 2015 GMC Sierra without fixing the underlying problem?

- While clearing the code temporarily using a scanner is possible, the code is likely to reappear if the root cause of the issue is not addressed. It is recommended to diagnose and repair the problem to prevent further complications.

7. Can extreme weather conditions affect the operation of the left side assist step in a 2015 GMC Sierra?

- Yes, extreme cold or moisture can potentially impact the performance of the assist step motor or control circuit, leading to malfunctions that trigger the OBDII code B051A.

8. How much does it typically cost to repair OBDII code B051A in a 2015 GMC Sierra at a dealership or mechanic?

- The cost of repairs can vary depending on the specific issue causing the code, but it is advisable to budget for parts and labor costs that may range from $200 to $500 or more, depending on the extent of the repair needed.

9. Are there any preventive maintenance measures I can take to avoid encountering OBDII code B051A in my 2015 GMC Sierra?

- Regularly inspecting the left side assist step components for signs of wear or damage, keeping the area clean and free of debris, and addressing any issues promptly can help prevent the occurrence of code B051A.

10. How long does it typically take to repair OBDII code B051A in a 2015 GMC Sierra?

- The repair time can vary based on the specific cause of the issue and the expertise of the technician. In general, diagnosing and repairing OBDII code B051A may take anywhere from 1 to 4 hours, depending on the complexity of the repair needed.