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Engine-Codes – Generic – B051B:02

B051B:02 Code - Right Side Assist Step Motor Control Circuit Short to Ground

Quick Answer

The B051B:02 code indicates a problem with the right side assist step motor control circuit, specifically a short to ground. Common causes include Damaged wiring or connectors in the right side assist step motor control circuit, Corrosion or moisture intrusion in the circuit, Faulty 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:02 indicates Right Side Assist Step Motor Control Circuit Short to Ground.
Common causes
Common causes include Damaged wiring or connectors in the right side assist step motor control circuit, Corrosion or moisture intrusion in the circuit, Faulty 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 14, 2024
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Code B051B:02 Description

The B051B:02 code indicates a problem with the right side assist step motor control circuit, specifically a short to ground. This code is typically found in vehicles equipped with power retractable running boards or steps that deploy when the door is opened and retract when the door is closed. The assist step motor control circuit is responsible for controlling the operation of the motor that extends and retracts the running board.

OBDII Code B051B:02 - Right Side Assist Step Motor Control Circuit Short to Ground
B051B:02 Code - Right Side Assist Step Motor Control Circuit Short to Ground

Common Causes of B051B:02

  1. Damaged wiring or connectors in the right side assist step motor control circuit.
  2. Corrosion or moisture intrusion in the circuit.
  3. Faulty assist step motor.
  4. Short circuit caused by a damaged component in the system.
  5. Electrical issues in the vehicle's wiring harness.

Symptoms of B051B:02

  1. Running board fails to deploy or retract properly.
  2. Running board gets stuck in the extended or retracted position.
  3. Unusual noises coming from the running board motor.
  4. Warning light on the dashboard related to the running board system.

How to Fix B051B:02

  1. Begin by conducting a visual inspection of the wiring and connectors in the right side assist step motor control circuit to look for any signs of damage, corrosion, or loose connections.
  2. Use a multimeter to test the continuity of the circuit and check for a short to ground.
  3. If a short to ground is detected, isolate the source of the short and repair or replace the affected wiring or component.
  4. Test the assist step motor to ensure it is functioning properly and replace it if necessary.
  5. Clear the diagnostic trouble codes from the vehicle's computer and test the running board system to verify that the issue has been resolved.

Cost to Fix B051B:02

The cost of repairing a right side assist step motor control circuit short to ground can vary depending on the extent of the damage and the specific components that need to be replaced. In general, the cost of parts for this repair can range from $100 to $300, while the labor cost can range from $150 to $400. Overall, the total repair cost for this issue is typically between $250 and $700. It's important to note that these are rough estimates, and actual costs may vary based on factors such as the vehicle make and model, the location of the repair shop, and the rates charged for parts and labor. It's recommended to consult with a qualified mechanic or repair shop for a more accurate cost estimate.

What does this mean?

Tech Notes for B051B:02

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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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:02 Code

1. What does OBDII code B051B:02 mean?

Code B051B:02 indicates a "Right Side Assist Step Motor Control Circuit Short to Ground," meaning there's an electrical issue causing the assist step motor on the right side to malfunction.

2. What are the symptoms of code B051B:02?

Common symptoms include the right side assist step not deploying or retracting properly, no motor response, or an electrical fault warning on the dashboard.

3. What causes code B051B:02 to trigger?

The code is often caused by damaged wiring, a short circuit in the motor control circuit, a faulty assist step motor, or a defective control module.

4. Can I still drive my vehicle with code B051B:02 active?

Yes, you can still drive the vehicle, but the right side assist step may not function correctly, potentially causing inconvenience or difficulty entering or exiting the vehicle.

5. How do I diagnose code B051B:02?

Start by inspecting the wiring and connectors for damage or corrosion, check for a short to ground in the circuit, test the assist step motor, and verify the control module's functionality.

6. How do I fix code B051B:02?

Repairs may include repairing or replacing damaged wiring, replacing the assist step motor if it's faulty, or reprogramming or replacing the control module if necessary.

7. How much does it cost to repair code B051B:02?

Repair costs can vary but generally range from $100 to $500, depending on whether wiring repair, motor replacement, or module replacement is required.

8. Can a blown fuse cause code B051B:02?

Yes, a blown fuse in the circuit could cause the code by interrupting power to the assist step motor or its control module.

9. How can I prevent code B051B:02 from occurring?

Regularly inspect and maintain the wiring and connectors near the assist step mechanism to prevent damage from debris, corrosion, or wear over time.

10. Do I need special tools to diagnose and repair code B051B:02?

Basic tools like a multimeter for checking electrical circuits and an OBDII scanner to clear the code are typically sufficient, but advanced diagnostics may require specialized tools for testing the motor and module.

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