AutoCodes – GMC – B051A 2016 GMC Sierra

B051A 2016 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 2016 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 295

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 2016 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 2016 GMC Sierra - Left Side Assist Step Motor Control Circuit - AutoCodes.com — B051A 2016 GMC Sierra Code - Left Side Assist Step Motor Control Circuit

What does this mean?

What are the Possible Causes of the DTC B051A 2016 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 2016 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 2016 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 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code B051A in a 2016 GMC Sierra related to the Left Side Assist Step Motor Control Circuit?

- The common symptoms include inoperative left side assist step, erratic movement of the assist step, and illuminated warning lights on the dashboard.

2. What can cause the OBDII code B051A to appear in a 2016 GMC Sierra?

- The code B051A usually appears due to issues with the left side assist step motor or its control circuit, such as wiring faults, motor malfunctions, or control module failures.

3. How can I diagnose the cause of OBDII code B051A in my 2016 GMC Sierra?

- A thorough inspection of the left side assist step motor, wiring harness, and control module is recommended. Using a scan tool to retrieve specific error codes and testing the components for proper functionality can help pinpoint the issue.

4. Is it safe to drive my 2016 GMC Sierra with OBDII code B051A triggered?

- It is generally safe to drive the vehicle with this code, but the left side assist step may not function correctly. It is advisable to address the issue promptly to ensure proper operation of the assist step.

5. Can I repair OBDII code B051A in my 2016 GMC Sierra myself?

- Depending on your mechanical skills and access to tools, you may be able to repair the issue yourself by replacing faulty components like the left side assist step motor, wiring, or control module.

6. How much does it cost to repair OBDII code B051A in a 2016 GMC Sierra at a repair shop?

- The cost of repairing OBDII code B051A can vary depending on the exact cause of the issue and the labor rates of the repair shop. It is recommended to obtain quotes from different shops for an accurate estimate.

7. Are there any preventative maintenance tips to avoid OBDII code B051A in a 2016 GMC Sierra?

- Regularly inspecting the left side assist step components for any signs of wear or damage, ensuring proper wiring connections, and keeping the area clean can help prevent issues leading to code B051A.

8. Can the OBDII code B051A in a 2016 GMC Sierra be intermittent?

- Yes, the code B051A related to the Left Side Assist Step Motor Control Circuit can sometimes be intermittent, especially if the issue is wiring-related or due to loose connections.

9. Will resetting the OBDII system clear the B051A code in a 2016 GMC Sierra?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing the B051A code is not addressed, it is likely to reappear upon the next self-test cycle.

10. How long does it typically take to repair OBDII code B051A in a 2016 GMC Sierra?

- The repair time for addressing OBDII code B051A can vary depending on the exact cause of the issue, accessibility of components, and the technician's experience. In some cases, it may be resolved within a few hours, while more complex issues may take longer to diagnose and repair.