AutoCodes – GMC – B051A 2014 GMC Sierra

B051A 2014 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 2014 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.

Save to My Repairs My Repairs

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

Code Popularity 232

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 B051A 2014 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 2014 GMC Sierra - Left Side Assist Step Motor Control Circuit - AutoCodes.com — B051A 2014 GMC Sierra Code - Left Side Assist Step Motor Control Circuit

What does this mean?

What are the Possible Causes of the DTC B051A 2014 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 2014 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 2014 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 B051A 2014 GMC Sierra code?

Need more information on how to fix the B051A 2014 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B051A 2014 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 B051A 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code B051A in a 2014 GMC Sierra related to the Left Side Assist Step Motor Control Circuit?

The common symptoms may include inoperative or erratic movement of the left side assist step on the vehicle.

2. What are the possible causes of OBDII code B051A in a 2014 GMC Sierra?

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

3. How can I diagnose the issue related to OBDII code B051A in my 2014 GMC Sierra?

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

4. Can I still drive my 2014 GMC Sierra with OBDII code B051A present?

It is generally not recommended to drive the vehicle with this code present, as it may indicate a safety concern with the left side assist step system.

5. How can I repair OBDII code B051A in my 2014 GMC Sierra?

Repairing this code may involve replacing the faulty assist step motor, repairing any damaged wiring or connectors, or reprogramming the control module as necessary.

6. Is it possible to reset OBDII code B051A in a 2014 GMC Sierra without fixing the underlying issue?

While you can clear the code using a scan tool, it is important to address the root cause of the problem to prevent the code from reoccurring.

7. Are there any DIY tips for troubleshooting OBDII code B051A in a 2014 GMC Sierra?

DIY tips may include visually inspecting the wiring and connectors for damage, checking for any loose connections, and ensuring the assist step motor is functioning properly.

8. How much does it typically cost to repair OBDII code B051A in a 2014 GMC Sierra at a professional mechanic or dealership?

The cost of repair can vary depending on the specific issue, but it may involve parts and labor expenses for replacing the assist step motor or repairing the wiring.

9. Can extreme weather conditions affect the occurrence of OBDII code B051A in a 2014 GMC Sierra?

Extreme weather conditions such as moisture or extreme temperatures can potentially damage the wiring or connectors in the left side assist step circuit, leading to the occurrence of this code.

10. Is it necessary to have a professional mechanic diagnose and repair OBDII code B051A in a 2014 GMC Sierra, or can it be done by a DIY enthusiast?

While some DIY enthusiasts may be able to diagnose and repair this code, it is recommended to consult a professional mechanic for accurate diagnosis and proper repair to ensure safety and functionality.