AutoCodes – Generic – B051E:02

B051E:02 Code - Assist Step Disable Switch Circuit Short to Ground

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:02 indicates Assist Step Disable Switch Circuit Short to Ground.
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 308

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:02 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:02 - Assist Step Disable Switch Circuit Short to Ground - AutoCodes.com — B051E:02 Code - Assist Step Disable Switch Circuit Short to Ground

What does this mean?

What are the Possible Causes of the DTC B051E:02?

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:02?

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:02 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.

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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:02 Code

1. What are the common symptoms of OBDII code B051E:02 (Assist Step Disable Switch Circuit Short to Ground)?

The common symptoms include inoperative assist steps, malfunctioning disable switch, and potentially illuminated warning lights on the dashboard.

2. What typically causes the OBDII code B051E:02 to appear?

The code is usually triggered by a short circuit between the assist step disable switch and the ground, resulting in a disruption of the circuit's normal function.

3. How can I diagnose the Assist Step Disable Switch Circuit Short to Ground issue?

Diagnosis involves inspecting the wiring harness for any visible damage, testing the disable switch for functionality, and using a multimeter to check for continuity and shorts in the circuit.

4. Can a DIY enthusiast repair the Assist Step Disable Switch Circuit Short to Ground problem?

While some basic troubleshooting steps can be performed by DIYers, repairing the circuit short may require professional help due to the complexity of the electrical system involved.

5. Is it safe to drive with the B051E:02 code present?

It is generally not recommended to drive with the code active, as it may lead to a complete failure of the assist step system, potentially causing safety hazards or further damage to the vehicle.

6. How much does it typically cost to repair the Assist Step Disable Switch Circuit Short to Ground issue?

The cost of repair can vary depending on the extent of the damage and whether professional services are required. It is advisable to get quotes from different mechanics or repair shops.

7. Can resetting the OBDII code B051E:02 make the issue go away temporarily?

Resetting the code may temporarily clear the warning lights, but if the underlying issue of the short circuit is not addressed, the code is likely to reappear once the system is activated again.

8. Are there any preventive measures to avoid the Assist Step Disable Switch Circuit Short to Ground problem?

Regularly inspecting the wiring harness, ensuring proper installation of any aftermarket components, and avoiding water damage to the electrical system can help prevent such issues.

9. How long does it take to repair the Assist Step Disable Switch Circuit Short to Ground problem?

The repair time can vary based on the severity of the issue and the availability of replacement parts. It is best to consult with a professional to get an accurate estimate.

10. Can the B051E:02 code be related to other electrical issues in the vehicle?

While the code specifically points to the assist step disable switch circuit, underlying electrical problems in the vehicle may sometimes manifest through interconnected systems, so a thorough inspection is recommended.