AutoCodes – Generic – B051C:02

B051C:02 Code - Left Side Assist Step Position Sensor Circuit Short to Ground

Q: 1. What does OBDII code B051C:02 mean?

Code B051C:02 indicates an issue with the left side assist step position sensor circuit, specifically a short to ground.

Q: 2. What are common symptoms of the B051C:02 code?

Symptoms may include the left side assist step not deploying or retracting properly, a warning light on the dashboard, or a stored fault code in the ECU.

Q: 3. What causes the B051C:02 code to appear?

Common causes include damaged wiring, a faulty assist step position sensor, corrosion in the electrical connections, or a short to ground in the circuit.

Q: 4. How do I diagnose the B051C:02 code?

Start by visually inspecting the wiring and connectors for damage or corrosion. Use a multimeter to check for continuity and test the sensor itself for proper function.

Q: 5. Can I still drive my vehicle with the B051C:02 code?

Yes, the vehicle is still drivable, but the left side assist step may not function correctly, which could be inconvenient or pose a safety risk when entering or exiting the vehicle.

Q: 6. How do I fix the B051C:02 code?

Repairs may involve replacing damaged wiring, cleaning or reconnecting corroded connectors, or replacing the faulty left side assist step position sensor.

Q: 7. Is the B051C:02 code covered under warranty?

This depends on your vehicle's warranty terms. Check with your dealership to determine if the assist step system is covered.

Q: 8. How much does it cost to repair the B051C:02 code?

Repair costs can vary, but replacing a position sensor typically costs between $100 and $300, including parts and labor.

Q: 9. Can I fix the B051C:02 code myself?

If you have basic automotive repair knowledge, you can inspect and replace wiring or the sensor yourself. However, professional diagnosis is recommended if you're unsure.

Q: 10. Will clearing the code fix the B051C:02 issue?

Clearing the code will remove it temporarily, but the underlying issue must be resolved to prevent the code from returning.

Quick Answer

The Assist Step Control (ASC) Module controls the running board actuators to extend or retract the running boards. Common causes include Faulty Left Side Assist Step Motor, Left Side Assist Step Motor harness is open or shorted, Left Side Assist Step Motor 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: B051C:02 indicates Left Side Assist Step Position Sensor Circuit Short to Ground.
Common causes: Common causes include Faulty Left Side Assist Step Motor, Left Side Assist Step Motor harness is open or shorted, Left Side Assist Step Motor 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 168

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 13, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
Add Comment

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Code B051C:02 Description

The Assist Step Control (ASC) Module controls the running board actuators to extend or retract the running boards. Each actuator consists of an electric motor and a potentiometer. The module supplies a low reference and 10-volt reference source voltage to the potentiometer. The ASC control module monitors the voltage drop across the potentiometer on the position signal circuit. When the actuator shaft rotates, the voltage on the position signal circuit changes. The ASC control module supplies the actuator motor with a 12-volt control circuit and a ground control circuit. The ASC module controls the direction of the actuator by changing the polarity of the control circuits.

OBDII Code B051C:02 - Left Side Assist Step Position Sensor Circuit Short to Ground - AutoCodes.com — B051C:02 Code - Left Side Assist Step Position Sensor Circuit Short to Ground

What does this mean?

What are the Possible Causes of the DTC B051C:02?

Faulty Left Side Assist Step Motor
Left Side Assist Step Motor harness is open or shorted
Left Side Assist Step Motor circuit poor electrical connection
Faulty Assist Step Control (ASC) Module

How to Fix the DTC B051C: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 does this mean?

Code Tech Notes

B051C:01 Left Side Assist Step Position Sensor Circuit Short to Battery
B051C:02 Left Side Assist Step Position Sensor Circuit Short to Ground
B051C:22 Left Side Assist Step Position Sensor Circuit Low Time < Minimum
B051C:29 Left Side Assist Step Position Sensor Circuit Too Few Pulses
B051C:2A Left Side Assist Step Position Sensor Circuit Too Many Pulses
B051C:62 Left Side Assist Step Position Sensor Circuit Actuator Stuck Open
B051C:63 Left Side Assist Step Position Sensor Circuit Actuator Stuck Closed

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B051C: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 B051C:02 Code

1. What does OBDII code B051C:02 mean?

Code B051C:02 indicates an issue with the left side assist step position sensor circuit, specifically a short to ground.

2. What are common symptoms of the B051C:02 code?

Symptoms may include the left side assist step not deploying or retracting properly, a warning light on the dashboard, or a stored fault code in the ECU.

3. What causes the B051C:02 code to appear?

Common causes include damaged wiring, a faulty assist step position sensor, corrosion in the electrical connections, or a short to ground in the circuit.

4. How do I diagnose the B051C:02 code?

Start by visually inspecting the wiring and connectors for damage or corrosion. Use a multimeter to check for continuity and test the sensor itself for proper function.

5. Can I still drive my vehicle with the B051C:02 code?

Yes, the vehicle is still drivable, but the left side assist step may not function correctly, which could be inconvenient or pose a safety risk when entering or exiting the vehicle.

6. How do I fix the B051C:02 code?

Repairs may involve replacing damaged wiring, cleaning or reconnecting corroded connectors, or replacing the faulty left side assist step position sensor.

7. Is the B051C:02 code covered under warranty?

This depends on your vehicle's warranty terms. Check with your dealership to determine if the assist step system is covered.

8. How much does it cost to repair the B051C:02 code?

Repair costs can vary, but replacing a position sensor typically costs between $100 and $300, including parts and labor.

9. Can I fix the B051C:02 code myself?

If you have basic automotive repair knowledge, you can inspect and replace wiring or the sensor yourself. However, professional diagnosis is recommended if you're unsure.

10. Will clearing the code fix the B051C:02 issue?

Clearing the code will remove it temporarily, but the underlying issue must be resolved to prevent the code from returning.