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B051A 2018 GMC Sierra Code - Left Side Assist Step Motor Control Circuit

Quick Answer

The B051A diagnostic trouble code (DTC) on a 2018 GMC Sierra relates to the Left Side Assist Step Motor Control Circuit. Common causes include Faulty left side assist step motor, Wiring issues in the control circuit, BCM malfunction. 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 2018 GMC Sierra indicates Left Side Assist Step Motor Control Circuit.
Common causes
Common causes include Faulty left side assist step motor, Wiring issues in the control circuit, BCM malfunction.
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 B051A 2018 GMC Sierra Description

The B051A diagnostic trouble code (DTC) on a 2018 GMC Sierra relates to the Left Side Assist Step Motor Control Circuit. This code indicates a malfunction in the control circuit for the motor that operates the left side assist step on the vehicle. The assist step motor control circuit is responsible for controlling the movement of the left side assist step, which deploys and retracts automatically to assist passengers in entering and exiting the vehicle. When this circuit malfunctions, it can lead to issues with the proper operation of the left side assist step.

OBDII Code B051A 2018 GMC Sierra - Left Side Assist Step Motor Control Circuit
B051A 2018 GMC Sierra Code - Left Side Assist Step Motor Control Circuit

Common Causes of B051A 2018 GMC Sierra

  1. Faulty left side assist step motor.
  2. Wiring issues in the control circuit.
  3. BCM malfunction.
  4. Poor electrical connections.
  5. Water or corrosion damage to the wiring or components.

Symptoms of B051A 2018 GMC Sierra

  1. Check engine light is illuminated.
  2. Left side assist step does not deploy or retract properly.
  3. Unusual noises coming from the left side assist step motor.
  4. Left side assist step gets stuck in one position.
  5. Vehicle may display a message on the dashboard indicating a problem with the assist step system.

How to Fix B051A 2018 GMC Sierra

  1. Begin by conducting a visual inspection of the wiring and connections in the left side assist step motor control circuit.
  2. Test the left side assist step motor for proper operation and continuity.
  3. Check the BCM for any fault codes related to the assist step system.
  4. Repair or replace any damaged wiring or connections.
  5. Clear the DTC and reset the BCM to see if the issue has been resolved.

Cost to Fix B051A 2018 GMC Sierra

The cost of repairing a B051A DTC related to the Left Side Assist Step Motor Control Circuit on a 2018 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of parts for this repair could range from $100 to $300, while labor costs could range from $80 to $150 per hour. The total cost of the repair could therefore be anywhere from $200 to $600 or more, depending on the extent of the problem and the rates charged by the repair shop. It's advisable to consult with a qualified mechanic or dealership for a more accurate estimate based on your specific situation.

What does this mean?

Tech Notes for B051A 2018 GMC Sierra

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

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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 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code B051A in a 2018 GMC Sierra related to the Left Side Assist Step Motor Control Circuit?

- Common symptoms include the left side assist step not deploying or retracting properly, intermittent operation of the assist step, or complete failure of the step to function.

2. What are some possible causes of OBDII code B051A in a 2018 GMC Sierra?

- The code B051A in a 2018 GMC Sierra may be triggered by issues such as a faulty left side assist step motor, damaged wiring or connectors in the control circuit, or a malfunctioning control module.

3. How can I diagnose the issue causing OBDII code B051A in my 2018 GMC Sierra?

- To diagnose the issue, you can use a diagnostic scanner to read the specific fault codes, inspect the wiring and connectors related to the left side assist step motor, and perform a thorough visual inspection of the step mechanism.

4. What are some repair tips for resolving OBDII code B051A in a 2018 GMC Sierra?

- Repair tips may include checking and repairing damaged wiring or connectors, replacing the left side assist step motor if it is faulty, and resetting the control module after making necessary repairs.

5. Can I fix OBDII code B051A in my 2018 GMC Sierra on my own, or do I need professional help?

- Depending on your automotive repair skills and tools available, you may be able to fix the issue causing code B051A on your own. However, if you are unsure or uncomfortable with electrical components, it is recommended to seek professional help.

6. Is it safe to drive my 2018 GMC Sierra with OBDII code B051A related to the Left Side Assist Step Motor Control Circuit?

- It is generally safe to drive the vehicle with this code, but you may experience inconvenience due to the malfunctioning left side assist step. It is recommended to address the issue promptly to restore the proper operation of the assist step.

7. How much does it typically cost to repair OBDII code B051A in a 2018 GMC Sierra at a dealership or repair shop?

- Repair costs for OBDII code B051A can vary depending on the exact cause of the issue and labor rates in your area. It is advisable to obtain quotes from different sources to compare prices.

8. Will resetting the OBDII system clear the B051A code in my 2018 GMC Sierra?

- While resetting the OBDII system may temporarily clear the code, it is important to diagnose and address the root cause of the issue triggering the code to prevent it from reoccurring.

9. Are there any recalls or technical service bulletins related to OBDII code B051A in a 2018 GMC Sierra?

- It is recommended to check with a GMC dealership or visit the manufacturer's website to see if there are any recalls or technical service bulletins related to OBDII code B051A in your specific vehicle model.

10. Can extreme weather conditions affect the operation of the Left Side Assist Step Motor Control Circuit in a 2018 GMC Sierra?

- Extreme weather conditions, such as extreme cold or moisture, can potentially impact the operation of the left side assist step motor control circuit in a 2018 GMC Sierra, leading to issues that trigger OBDII code B051A. Regular maintenance and inspection can help prevent weather-related problems.

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