AutoCodes – GMC – B051E 2016 GMC Sierra

B051E 2016 GMC Sierra Code - Assist Step Disable Switch Circuit

Quick Answer

The Assist Step Control (ASC) Module monitors a signal circuit to the assist step disable switch. Common causes include Faulty Assist Step Disable Switch, Assist Step Disable Switch harness is open or shorted, Assist Step Disable Switch 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: B051E 2016 GMC Sierra indicates Assist Step Disable Switch Circuit.
Common causes: Common causes include Faulty Assist Step Disable Switch, Assist Step Disable Switch harness is open or shorted, Assist Step Disable Switch 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 177

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 18, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B051E 2016 GMC Sierra Description

The Assist Step Control (ASC) Module monitors a signal circuit to the assist step disable switch. When the switch is pressed, a ground path is provided to the signal circuit. Pressing the switch with the doors closed while in Park or Neutral will extend the boards for washing. Pressing and holding the switch for 4 s will disable/enable running boards by putting them in Locked mode. The Diagnostic Trouble Code (DTC) will be set when the signal circuit is shorted to ground for longer than 1 min.

OBDII Code B051E 2016 GMC Sierra - Assist Step Disable Switch Circuit - AutoCodes.com — B051E 2016 GMC Sierra Code - Assist Step Disable Switch Circuit

What does this mean?

What are the Possible Causes of the DTC B051E 2016 GMC Sierra?

Faulty Assist Step Disable Switch
Assist Step Disable Switch harness is open or shorted
Assist Step Disable Switch circuit poor electrical connection
Faulty Assist Step Control (ASC) Module

How to Fix the DTC B051E 2016 GMC Sierra?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B051E 2016 GMC Sierra 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.

Need more information about the B051E 2016 GMC Sierra code?

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Need Help with the Code?

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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 2016 GMC Sierra Code

1. What does the OBDII code B051E mean on a 2016 GMC Sierra?

The code B051E indicates an issue with the Assist Step Disable Switch Circuit, which controls the power running boards or assist steps.

2. What are the common symptoms of the B051E code?

Symptoms include assist steps not deploying or retracting, no response from the disable switch, or a related warning message on the dashboard.

3. What causes the B051E code to appear?

Common causes include a faulty assist step disable switch, damaged wiring or connectors in the circuit, or a malfunctioning control module.

4. How can I diagnose the B051E code?

Start by checking the assist step disable switch for proper operation, inspect the wiring and connectors for damage or corrosion, and use a scan tool to verify the fault.

5. Can I continue driving with the B051E code active?

Yes, but the assist steps may not function properly, which can be inconvenient and potentially hazardous when entering or exiting the vehicle.

6. How do I fix the B051E code on a 2016 GMC Sierra?

Repairs may involve replacing the assist step disable switch, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the control module.

7. How much does it cost to fix the B051E code?

Repair costs can vary, but replacing the switch or repairing wiring typically ranges from $100 to $300, while control module replacement may cost more.

8. Can a blown fuse cause the B051E code?

Yes, a blown fuse in the assist step circuit can trigger the code, so checking the fuses is a good first step.

9. Is the B051E code specific to the 2016 GMC Sierra?

While it commonly appears in GMC Sierra models, the code may also apply to other GM vehicles with similar assist step systems.

10. Do I need professional help to fix the B051E code?

If you're comfortable with basic electrical diagnostics and repairs, you can attempt the fix yourself. Otherwise, itâ€™s best to consult a professional mechanic.