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B051A Buick 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 Buick 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 815

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 Buick 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 Buick - Left Side Assist Step Motor Control Circuit - AutoCodes.com — B051A Buick Code - Left Side Assist Step Motor Control Circuit

What does this mean?

What are the Possible Causes of the DTC B051A Buick?

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 Buick?

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 Buick 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 Buick Code

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

The common symptoms include malfunctioning or non-operational left side assist step, difficulty getting in and out of the vehicle, and a warning light on the dashboard.

2. What are the possible causes of OBDII code B051A in a Buick?

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

3. How can I diagnose the issue related to the Left Side Assist Step Motor Control Circuit in my Buick?

You can diagnose the problem by checking the wiring and connectors for any visible damage, testing the assist step motor for functionality, and using a diagnostic scanner to read the specific error codes.

4. Are there any simple repair tips for fixing OBDII code B051A in a Buick?

Some simple repair tips include checking and repairing any damaged wiring or connectors, replacing the assist step motor if it's faulty, and resetting the control module to clear the code.

5. Can I drive my Buick with OBDII code B051A related to the Left Side Assist Step Motor Control Circuit?

It is not recommended to drive the vehicle with this code unresolved, as it may affect the functionality of the left side assist step and compromise safety.

6. How much does it typically cost to repair OBDII code B051A in a Buick?

The cost of repairs can vary depending on the exact cause of the issue and whether you choose to fix it yourself or take it to a mechanic. It's advisable to get a professional diagnosis for an accurate estimate.

7. Is it possible to reset OBDII code B051A in a Buick without fixing the underlying issue?

While you can clear the code temporarily by resetting the control module, it will likely reappear if the root cause of the problem is not addressed.

8. Can extreme weather conditions affect the Left Side Assist Step Motor Control Circuit in a Buick and trigger OBDII code B051A?

Yes, extreme temperatures or moisture can potentially damage the wiring or components in the control circuit, leading to the activation of this diagnostic trouble code.

9. Are there any preventative maintenance steps I can take to avoid encountering OBDII code B051A in my Buick?

Regularly inspecting the assist step system, keeping it clean and well-lubricated, and addressing any issues promptly can help prevent the occurrence of this code.

10. How long does it typically take to repair OBDII code B051A related to the Left Side Assist Step Motor Control Circuit in a Buick?

The repair time can vary based on the complexity of the issue and the availability of parts. It's best to consult a professional to get an accurate estimate of the repair duration.