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B051E 2018 GMC Sierra Code - Assist Step Disable Switch Circuit

Quick Answer

The B051E diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the Assist Step Disable Switch Circuit. Common causes include Faulty assist step disable switch, Wiring issues or shorts in the circuit, Malfunctioning control module for the assist steps. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
B051E 2018 GMC Sierra indicates Assist Step Disable Switch Circuit.
Common causes
Common causes include Faulty assist step disable switch, Wiring issues or shorts in the circuit, Malfunctioning control module for the assist steps.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 14, 2024
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Code B051E 2018 GMC Sierra Description

The B051E diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the Assist Step Disable Switch Circuit. This code indicates a problem with the circuit that controls the assist steps on the vehicle. Assist steps are motorized or retractable steps that extend when a door is opened to help passengers enter and exit the vehicle more easily. The disable switch is used to manually turn off the assist steps, typically to prevent them from deploying in certain situations, such as off-road driving or car washing.

OBDII Code B051E 2018 GMC Sierra - Assist Step Disable Switch Circuit
B051E 2018 GMC Sierra Code - Assist Step Disable Switch Circuit

Common Causes of B051E 2018 GMC Sierra

  1. Faulty assist step disable switch.
  2. Wiring issues or shorts in the circuit.
  3. Malfunctioning control module for the assist steps.
  4. Defective assist step motor.
  5. Corrosion or damage to electrical connections related to the circuit.

Symptoms of B051E 2018 GMC Sierra

  1. Assist steps not deploying when doors are opened.
  2. Inability to manually disable the assist steps using the switch.
  3. Warning light on the dashboard indicating a problem with the assist steps.
  4. Unusual noises or vibrations when the assist steps are in operation.

How to Fix B051E 2018 GMC Sierra

  1. Begin by conducting a visual inspection of the assist step disable switch and surrounding wiring to check for any obvious signs of damage or wear.
  2. Use a multimeter to test the continuity of the switch and the wiring to identify any faulty components.
  3. Inspect the control module for the assist steps to ensure it is functioning correctly and communicating with the vehicle's computer.
  4. If necessary, replace the assist step disable switch, repair any damaged wiring, or replace the control module or motor as needed.
  5. Clear the DTC from the vehicle's computer using a diagnostic tool to reset the system and ensure the code does not reappear.

Cost to Fix B051E 2018 GMC Sierra

The cost of repairing a B051E code for the Assist Step Disable Switch Circuit on a 2018 GMC Sierra can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost of parts for this repair could range from $50 to $200, with labor costs adding an additional $100 to $300. Overall, the total repair cost could fall between $150 and $500, but it is advisable to obtain a detailed quote from a reputable auto repair shop to get an accurate estimate. Keep in mind that labor rates and diagnostic fees can vary based on location, vehicle make and model, and other factors, so it's a good idea to shop around for the best price.

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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 B051E 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code B051E in a 2018 GMC Sierra related to the Assist Step Disable Switch Circuit?

- Common symptoms include malfunctioning assist steps, disabled auto-retract feature, and warning lights on the dashboard.

2. What are some possible causes of OBDII code B051E in a 2018 GMC Sierra?

- Potential causes may include a faulty disable switch, damaged wiring harness, poor electrical connections, or a defective control module.

3. How can I diagnose the Assist Step Disable Switch Circuit issue triggering OBDII code B051E in my 2018 GMC Sierra?

- Start by checking the disable switch for proper functionality, inspecting the wiring for any damage, and testing the control module. A diagnostic scanner can also help pinpoint the exact problem.

4. Can I continue driving my 2018 GMC Sierra with OBDII code B051E related to the Assist Step Disable Switch Circuit?

- While the vehicle may still be operable, it is recommended to address the issue promptly to prevent further damage to the assist step system.

5. Is it possible to reset OBDII code B051E in my 2018 GMC Sierra without fixing the underlying issue?

- Resetting the code without fixing the root cause will only temporarily clear the warning light. The problem will likely resurface until the underlying issue is resolved.

6. Are there any DIY repair tips for fixing OBDII code B051E in a 2018 GMC Sierra?

- DIY enthusiasts can attempt to check and clean electrical connections, inspect and repair damaged wires, or replace the disable switch if it is found to be faulty.

7. How much does it typically cost to repair OBDII code B051E related to the Assist Step Disable Switch Circuit in a 2018 GMC Sierra?

- Repair costs can vary depending on the exact cause of the issue. It is recommended to consult a professional mechanic for an accurate diagnosis and cost estimate.

8. Can a regular car owner without advanced technical knowledge fix OBDII code B051E in a 2018 GMC Sierra?

- While some basic troubleshooting steps can be performed by a regular car owner, diagnosing and repairing complex electrical issues like this code may require the expertise of a professional mechanic.

9. Will fixing OBDII code B051E in my 2018 GMC Sierra improve fuel efficiency or vehicle performance?

- Resolving the issue related to the Assist Step Disable Switch Circuit will primarily ensure proper functioning of the assist steps and related systems, rather than directly impacting fuel efficiency or vehicle performance.

10. How long does it typically take to repair OBDII code B051E in a 2018 GMC Sierra at a certified dealership or repair shop?

- The repair time can vary based on the specific cause of the code and the availability of parts. In general, it may take a few hours to a day to diagnose and fix the issue at a professional facility.

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