AutoCodes – GMC – B051E GMC

B051E GMC 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 GMC 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 299

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

What does this mean?

What are the Possible Causes of the DTC B051E GMC?

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 GMC?

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 GMC 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 GMC code?

Need more information on how to fix the B051E GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B051E GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

B051E 2014 GMC Sierra — Assist Step Disable Switch Circuit
B051E 2015 GMC Sierra — Assist Step Disable Switch Circuit
B051E 2016 GMC Sierra — Assist Step Disable Switch Circuit
B051E 2017 GMC Sierra — Assist Step Disable Switch Circuit
B051E 2018 GMC Sierra — Assist Step Disable Switch Circuit

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 GMC Code

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

The B051E code indicates an issue with the Assist Step Disable Switch Circuit, which controls the power-retractable assist steps on your GMC vehicle.

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

Symptoms include the retractable assist steps not extending or retracting properly, a non-functional disable switch, or a warning message on the dashboard.

3. What causes the B051E code to appear?

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

4. How do I diagnose the B051E code?

Use a scan tool to confirm the code, visually inspect the assist step disable switch and wiring, and test the circuit for proper voltage and continuity.

5. Can I drive my GMC with a B051E code?

Yes, the vehicle is still drivable, but the assist steps may not function as intended, which could be inconvenient or create accessibility issues.

6. How can I fix the B051E code on my GMC?

Repairs may involve replacing a faulty disable switch, repairing damaged wiring or connectors, or reprogramming or replacing the control module if necessary.

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

The cost depends on the specific issue, but replacing the disable switch may cost around $50-$150, while wiring repairs or module replacement could be more expensive.

8. Can a B051E code clear itself?

The code may clear itself if the issue is intermittent and resolves on its own, but persistent problems will require repairs to clear the code.

9. Is the B051E code related to other systems in the vehicle?

The code specifically relates to the assist step disable switch circuit, but issues in the body control module or electrical system could also contribute.

10. Do I need a professional mechanic to repair a B051E code?

While some basic repairs, like replacing a switch, can be done by experienced DIYers, complex diagnostics or electrical repairs may require a professional.