AutoCodes – Generic – B051C:63

B051C:63 Code - Left Side Assist Step Position Sensor Circuit Actuator Stuck Closed

Q: What does the OBDII code B051C:63 mean?

The code B051C:63 indicates that the left side assist step position sensor circuit actuator is stuck in the closed position, meaning the step may not deploy or retract properly.

Q: What are the symptoms of the B051C:63 code?

Common symptoms include the left side assist step not deploying or retracting, unusual noises from the step mechanism, or a warning light on the dashboard.

Q: What causes the B051C:63 code?

This code can be caused by a malfunctioning position sensor, a stuck or damaged assist step actuator, corroded wiring or connectors, or physical obstructions in the step mechanism.

Q: Can I still drive my vehicle with the B051C:63 code?

Yes, you can still drive the vehicle, but the assist step may not function correctly, which could make it harder to enter or exit the vehicle.

Q: How can I diagnose the B051C:63 code?

Start by inspecting the left side assist step for physical damage or obstructions, check the wiring and connectors for corrosion or damage, and test the position sensor and actuator for proper operation.

Q: What tools do I need to fix the B051C:63 code?

You may need a diagnostic scan tool, a multimeter for electrical testing, basic hand tools for repairs, and possibly a replacement sensor or actuator.

Q: How can I fix the B051C:63 code?

Fixes may include cleaning or repairing damaged wiring, replacing the faulty position sensor, lubricating the assist step mechanism, or replacing the actuator if itâ€™s stuck or damaged.

Q: How much does it cost to repair the B051C:63 code?

Repair costs vary but may range from $100 to $500 depending on whether you need to replace the sensor, actuator, or repair wiring.

Q: Can I prevent the B051C:63 code from occurring?

Regularly cleaning and lubricating the assist step mechanism, inspecting for damage, and addressing issues promptly can help prevent this code.

Q: Do I need a mechanic to fix the B051C:63 code?

If youâ€™re comfortable with basic diagnostics and repairs, you can attempt to fix this issue yourself. Otherwise, a qualified mechanic can diagnose and repair it for you.

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:63 indicates Left Side Assist Step Position Sensor Circuit Actuator Stuck Closed.
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 248

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
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Code B051C:63 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. The Diagnostic Trouble Code (DTC) will be set when the running board extend time is greater than 4 s.

OBDII Code B051C:63 - Left Side Assist Step Position Sensor Circuit Actuator Stuck Closed - AutoCodes.com — B051C:63 Code - Left Side Assist Step Position Sensor Circuit Actuator Stuck Closed

What does this mean?

What are the Possible Causes of the DTC B051C:63?

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:63?

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:63 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:63 Code

What does the OBDII code B051C:63 mean?

The code B051C:63 indicates that the left side assist step position sensor circuit actuator is stuck in the closed position, meaning the step may not deploy or retract properly.

What are the symptoms of the B051C:63 code?

Common symptoms include the left side assist step not deploying or retracting, unusual noises from the step mechanism, or a warning light on the dashboard.

What causes the B051C:63 code?

This code can be caused by a malfunctioning position sensor, a stuck or damaged assist step actuator, corroded wiring or connectors, or physical obstructions in the step mechanism.

Can I still drive my vehicle with the B051C:63 code?

Yes, you can still drive the vehicle, but the assist step may not function correctly, which could make it harder to enter or exit the vehicle.

How can I diagnose the B051C:63 code?

Start by inspecting the left side assist step for physical damage or obstructions, check the wiring and connectors for corrosion or damage, and test the position sensor and actuator for proper operation.

What tools do I need to fix the B051C:63 code?

You may need a diagnostic scan tool, a multimeter for electrical testing, basic hand tools for repairs, and possibly a replacement sensor or actuator.

How can I fix the B051C:63 code?

Fixes may include cleaning or repairing damaged wiring, replacing the faulty position sensor, lubricating the assist step mechanism, or replacing the actuator if itâ€™s stuck or damaged.

How much does it cost to repair the B051C:63 code?

Repair costs vary but may range from $100 to $500 depending on whether you need to replace the sensor, actuator, or repair wiring.

Can I prevent the B051C:63 code from occurring?

Regularly cleaning and lubricating the assist step mechanism, inspecting for damage, and addressing issues promptly can help prevent this code.

Do I need a mechanic to fix the B051C:63 code?

If youâ€™re comfortable with basic diagnostics and repairs, you can attempt to fix this issue yourself. Otherwise, a qualified mechanic can diagnose and repair it for you.