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Engine-Codes – Generic – B051B

B051B Code - Right Side Assist Step Motor Control Circuit

Quick Answer

The B051B diagnostic trouble code (DTC) refers to a malfunction in the right side assist step motor control circuit. Common causes include Faulty right side assist step motor, Wiring or connector issues in the control circuit, Defective control module responsible for managing the assist step motor. 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 indicates Right Side Assist Step Motor Control Circuit.
Common causes
Common causes include Faulty right side assist step motor, Wiring or connector issues in the control circuit, Defective control module responsible for managing the assist step motor.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 13, 2024
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Code B051B Description

The B051B diagnostic trouble code (DTC) refers to a malfunction in the right side assist step motor control circuit. This code indicates that there is an issue with the control circuit that operates the motor for the right side assist step on the vehicle. The assist step motor is responsible for deploying and retracting the side step to assist passengers in entering and exiting the vehicle easily.

OBDII Code B051B - Right Side Assist Step Motor Control Circuit
B051B Code - Right Side Assist Step Motor Control Circuit

Common Causes of B051B

  1. Faulty right side assist step motor.
  2. Wiring or connector issues in the control circuit.
  3. Defective control module responsible for managing the assist step motor.
  4. Corrosion or damage to electrical connections related to the assist step system.

Symptoms of B051B

  1. Right side assist step fails to deploy or retract.
  2. Unusual noises coming from the right side assist step motor.
  3. Warning light on the dashboard indicating an issue with the assist step system.
  4. Difficulty for passengers to enter or exit the vehicle due to a malfunctioning assist step.

How to Fix B051B

  1. Begin by conducting a visual inspection of the right side assist step motor, wiring, and connectors to check for any visible damage or corrosion.
  2. Use a multimeter to test the continuity of the wiring in the control circuit to identify any open or short circuits.
  3. Test the control module for proper functionality and replace it if necessary.
  4. Replace the right side assist step motor if it is found to be faulty.
  5. Clear the DTC from the vehicle's computer system using a diagnostic scan tool after completing the repairs.

Cost to Fix B051B

The typical repair costs for addressing a B051B code related to the right side assist step motor control circuit can vary depending on the specific cause of the issue. In general, the cost of replacing a faulty assist step motor can range from $200 to $500, while replacing a control module may cost between $300 and $700. Labor costs for these repairs can add an additional $100 to $300, depending on the shop's hourly rates.

What does this mean?

Tech Notes for B051B

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

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Code B051B Information for Specific Makes

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 Code

1. What are the common symptoms of OBDII code B051B?

The common symptoms of OBDII code B051B include issues with the right side assist step motor control circuit, such as malfunctioning or inoperative power running boards on the right side of the vehicle.

2. What causes the OBDII code B051B to trigger?

The OBDII code B051B typically triggers due to a fault in the right side assist step motor control circuit, which can be caused by damaged wiring, a faulty motor, or a malfunctioning control module.

3. How can I diagnose the OBDII code B051B?

Diagnosis of OBDII code B051B involves using a scan tool to retrieve the specific fault code and then inspecting the wiring, connectors, and components related to the right side assist step motor control circuit for any visible damage or issues.

4. Can I still drive my vehicle with the OBDII code B051B present?

It is generally safe to drive your vehicle with the OBDII code B051B present, but it is recommended to address the underlying issue promptly to ensure the proper functioning of the right side assist step motor control circuit.

5. How can I repair the OBDII code B051B?

Repairing OBDII code B051B involves identifying and addressing the root cause of the issue, which may include repairing or replacing damaged wiring, replacing a faulty motor, or reprogramming the control module if necessary.

6. Are there any DIY tips for fixing the OBDII code B051B?

While some basic troubleshooting steps can be performed by DIY enthusiasts, diagnosing and repairing the OBDII code B051B may require specialized tools and expertise, so it is recommended to consult a professional mechanic for proper diagnosis and repair.

7. Will resetting the OBDII code B051B make it go away permanently?

Resetting the OBDII code B051B may temporarily clear the code, but if the underlying issue in the right side assist step motor control circuit is not addressed, the code is likely to reappear. It is important to diagnose and repair the root cause of the problem.

8. How much does it typically cost to repair the OBDII code B051B?

The cost of repairing OBDII code B051B can vary depending on the specific cause of the issue, the extent of the damage, and the labor rates in your area. It is advisable to obtain quotes from different mechanics or repair shops for an accurate estimate.

9. Can extreme weather conditions affect the right side assist step motor control circuit and trigger the OBDII code B051B?

Extreme weather conditions such as exposure to moisture, salt, or extreme temperatures can potentially damage the wiring or components of the right side assist step motor control circuit, leading to the triggering of OBDII code B051B.

10. Is the OBDII code B051B specific to certain vehicle makes and models?

OBDII code B051B related to the right side assist step motor control circuit can be specific to certain vehicle makes and models that are equipped with power running boards or similar assistive mechanisms on the right side. It is important to consult the vehicle's service manual for specific information.

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