AutoCodes – Buick – B051B Buick

B051B Buick 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 Buick 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 1,000

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

What does this mean?

What are the Possible Causes of the DTC B051B Buick?

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 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

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 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 B051B Buick Code

1. What are the common symptoms of OBDII code B051B in a Buick related to the Right Side Assist Step Motor Control Circuit?

- Common symptoms include malfunctioning power running boards, unresponsive right-side assist step, and warning lights on the dashboard.

2. What are the possible causes of OBDII code B051B in a Buick?

- Possible causes include a faulty right side assist step motor, wiring issues in the control circuit, damaged connectors, or a defective control module.

3. How can I diagnose the Right Side Assist Step Motor Control Circuit issue causing OBDII code B051B in my Buick?

- You can diagnose the issue by performing a visual inspection of the wiring and connectors, testing the right side assist step motor, and using an OBDII scanner to retrieve the specific error codes.

4. Can I drive my Buick with OBDII code B051B related to the Right Side Assist Step Motor Control Circuit?

- It is not recommended to drive your Buick with this code as it may affect the functionality of the power running boards, posing a safety risk.

5. How can I repair OBDII code B051B in my Buick associated with the Right Side Assist Step Motor Control Circuit?

- Repair options may include replacing the right side assist step motor, repairing any damaged wiring or connectors, and resetting the control module after fixing the issue.

6. Are there any DIY tips for troubleshooting OBDII code B051B in a Buick?

- You can start by checking the fuses related to the power running boards, inspecting the wiring for any visible damage, and ensuring all connectors are securely attached.

7. Is it necessary to visit a mechanic for OBDII code B051B in a Buick?

- While some basic troubleshooting can be done at home, it is recommended to visit a mechanic or dealership for a comprehensive diagnosis and proper repair of the issue.

8. How much does it typically cost to repair OBDII code B051B in a Buick associated with the Right Side Assist Step Motor Control Circuit?

- Repair costs can vary depending on the specific cause of the issue, but they may range from $200 to $600, including parts and labor.

9. Can OBDII code B051B in a Buick clear on its own after the issue is fixed?

- In some cases, the code may clear on its own after the repair is completed. However, it is advisable to use an OBDII scanner to clear the code manually for accurate diagnostics.

10. How can I prevent OBDII code B051B from reoccurring in my Buick in the future?

- To prevent the recurrence of this code, it is essential to perform regular maintenance checks on the power running boards, inspect the wiring periodically, and address any issues promptly.