AutoCodes – GMC – B051C GMC

B051C GMC Code - Left Side Assist Step Position Sensor Circuit

Q: 1. What are common symptoms of the OBDII code B051C GMC?

- Common symptoms include malfunctioning left side assist step, warning lights on the dashboard, and issues with the assist step deployment.

Q: 2. What causes the OBDII code B051C GMC to trigger?

- The code B051C is triggered when there is a malfunction in the left side assist step position sensor circuit, often due to wiring issues or sensor failure.

Q: 3. How can I diagnose the issue related to the B051C code?

- Diagnosing the issue requires using a scan tool to read the code, checking the wiring and connections related to the left side assist step sensor, and performing a sensor functionality test.

Q: 4. Can I still drive my vehicle with the B051C code present?

- It is generally safe to drive the vehicle with the B051C code, but it is recommended to address the issue promptly to ensure the proper functioning of the left side assist step.

Q: 5. How can I repair the left side assist step position sensor circuit related to the B051C code?

- Repairing the issue may involve fixing wiring connections, replacing the left side assist step position sensor, or reprogramming the sensor to resolve the circuit malfunction.

Q: 6. Are there any DIY tips for troubleshooting the B051C code?

- DIY tips include visually inspecting the wiring for any visible damage, checking the sensor connections, and ensuring there are no obstructions affecting the left side assist step.

Q: 7. How much does it typically cost to repair the B051C code issue?

- The cost of repair can vary depending on the exact cause of the issue, but it may involve a few hundred dollars for parts and labor at a dealership or repair shop.

Q: 8. Is the B051C code a common problem in GMC vehicles?

- The B051C code related to the left side assist step position sensor circuit is not extremely common but can occur in certain GMC models equipped with this feature.

Q: 9. Can weather conditions affect the triggering of the B051C code?

- Extreme weather conditions, such as heavy rain or snow, can potentially affect the functionality of the left side assist step sensor circuit and lead to the triggering of the B051C code.

Q: 10. How often should the left side assist step position sensor circuit be inspected to prevent the B051C code issue?

- It is recommended to include a regular inspection of the left side assist step position sensor circuit during routine vehicle maintenance to catch any potential issues early and prevent the B051C code from occurring.

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 GMC indicates Left Side Assist Step Position Sensor Circuit.
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 1,698

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 GMC 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 GMC - Left Side Assist Step Position Sensor Circuit - AutoCodes.com — B051C GMC Code - Left Side Assist Step Position Sensor Circuit

What does this mean?

What are the Possible Causes of the DTC B051C GMC?

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 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 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 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 B051C GMC code?

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Need Help with the Code?

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Information for Specific GMC Models

B051C 2014 GMC Sierra — Left Side Assist Step Position Sensor Circuit
B051C 2015 GMC Sierra — Left Side Assist Step Position Sensor Circuit
B051C 2016 GMC Sierra — Left Side Assist Step Position Sensor Circuit
B051C 2017 GMC Sierra — Left Side Assist Step Position Sensor Circuit
B051C 2018 GMC Sierra — Left Side Assist Step Position Sensor 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 B051C GMC Code

1. What are common symptoms of the OBDII code B051C GMC?

- Common symptoms include malfunctioning left side assist step, warning lights on the dashboard, and issues with the assist step deployment.

2. What causes the OBDII code B051C GMC to trigger?

- The code B051C is triggered when there is a malfunction in the left side assist step position sensor circuit, often due to wiring issues or sensor failure.

3. How can I diagnose the issue related to the B051C code?

- Diagnosing the issue requires using a scan tool to read the code, checking the wiring and connections related to the left side assist step sensor, and performing a sensor functionality test.

4. Can I still drive my vehicle with the B051C code present?

- It is generally safe to drive the vehicle with the B051C code, but it is recommended to address the issue promptly to ensure the proper functioning of the left side assist step.

5. How can I repair the left side assist step position sensor circuit related to the B051C code?

- Repairing the issue may involve fixing wiring connections, replacing the left side assist step position sensor, or reprogramming the sensor to resolve the circuit malfunction.

6. Are there any DIY tips for troubleshooting the B051C code?

- DIY tips include visually inspecting the wiring for any visible damage, checking the sensor connections, and ensuring there are no obstructions affecting the left side assist step.

7. How much does it typically cost to repair the B051C code issue?

- The cost of repair can vary depending on the exact cause of the issue, but it may involve a few hundred dollars for parts and labor at a dealership or repair shop.

8. Is the B051C code a common problem in GMC vehicles?

- The B051C code related to the left side assist step position sensor circuit is not extremely common but can occur in certain GMC models equipped with this feature.

9. Can weather conditions affect the triggering of the B051C code?

- Extreme weather conditions, such as heavy rain or snow, can potentially affect the functionality of the left side assist step sensor circuit and lead to the triggering of the B051C code.

10. How often should the left side assist step position sensor circuit be inspected to prevent the B051C code issue?

- It is recommended to include a regular inspection of the left side assist step position sensor circuit during routine vehicle maintenance to catch any potential issues early and prevent the B051C code from occurring.