AutoCodes – Cadillac – B051B Cadillac

B051B Cadillac Code - Right Side Assist Step Motor Control Circuit

Quick Answer

The Assist Step Control (ASC) Module controls the running board actuators to extend or retract the running boards. Common causes include Faulty Right Side Assist Step Motor, Right Side Assist Step Motor harness is open or shorted, Right 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: B051B Cadillac indicates Right Side Assist Step Motor Control Circuit.
Common causes: Common causes include Faulty Right Side Assist Step Motor, Right Side Assist Step Motor harness is open or shorted, Right 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 1,223

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 B051B Cadillac 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 B051B Cadillac - Right Side Assist Step Motor Control Circuit - AutoCodes.com — B051B Cadillac Code - Right Side Assist Step Motor Control Circuit

What does this mean?

What are the Possible Causes of the DTC B051B Cadillac?

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

How to Fix the DTC B051B Cadillac?

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

B051B:0B Right Side Assist Step Motor Control Circuit Current Above Threshold
B051B:01 Right Side Assist Step Motor Control Circuit Short to Battery
B051B:02 Right Side Assist Step Motor Control Circuit Short to Ground
B051B:04 Right Side Assist Step Motor Control Circuit Open Circuit

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B051B Cadillac 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 B051B Cadillac Code

1. What are the common symptoms of OBDII code B051B in a Cadillac related to the Right Side Assist Step Motor Control Circuit?

- Common symptoms include malfunctioning or non-operational right side assist step, intermittent power running boards, and illuminated warning lights on the dashboard.

2. What are the possible causes of OBDII code B051B in a Cadillac?

- The code B051B in a Cadillac can be caused by issues such as a faulty assist step motor, damaged wiring or connectors in the control circuit, or a malfunctioning control module.

3. How can I diagnose the OBDII code B051B in my Cadillac related to the Right Side Assist Step Motor Control Circuit?

- Diagnosing this code typically involves using a diagnostic scanner to retrieve the specific fault code, conducting a visual inspection of the wiring and connectors, and testing the assist step motor and control module for proper function.

4. Is it safe to drive my Cadillac with the OBDII code B051B triggered?

- It is generally safe to drive the vehicle with this code triggered, but it is recommended to address the issue promptly to ensure the proper operation of the right side assist step.

5. Can I repair the OBDII code B051B in my Cadillac at home, or do I need professional help?

- The repair process for code B051B may vary in complexity, and some DIY enthusiasts may be able to address it at home by replacing the faulty motor, repairing damaged wiring, or resetting the control module. However, if you are unsure or inexperienced, it's advisable to seek professional help.

6. Are there any tips for preventing OBDII code B051B from recurring in my Cadillac?

- To prevent code B051B from recurring, you can perform regular maintenance checks on the assist step system, ensure proper cleaning and lubrication of moving parts, and address any issues promptly to avoid further damage.

7. How much does it typically cost to repair OBDII code B051B in a Cadillac at a dealership or repair shop?

- The cost of repair for code B051B can vary depending on the root cause of the issue, the required parts, and labor costs. It's recommended to obtain estimates from different service providers for comparison.

8. Will resetting the OBDII code B051B in my Cadillac make the problem go away permanently?

- Resetting the code may temporarily clear the warning lights, but if the underlying issue causing code B051B is not addressed, the problem is likely to recur. It's crucial to diagnose and repair the root cause for a permanent solution.

9. Can extreme weather conditions affect the triggering of OBDII code B051B in a Cadillac?

- Extreme weather conditions, such as excessive heat, cold, or moisture, can potentially impact the operation of the right side assist step motor control circuit and contribute to triggering code B051B. Proper maintenance and protection against harsh weather can help prevent such issues.

10. Is there a recall or technical service bulletin related to OBDII code B051B in Cadillac vehicles?

- It's recommended to check with the nearest Cadillac dealership or service center for any recalls or technical service bulletins related to code B051B, as manufacturers may provide guidance or assistance for addressing known issues.