AutoCodes – Generic – B2551

B2551 Code - Pulse Width Modulation Motor Right Power Supply Circuit Malfunction

Quick Answer

This circuit indicates the roof motor, luggage motor or luggage closer motor depending on which motor is being used. Common causes include Faulty Sliding Roof Control ECU, Sliding Roof Control ECU harness is open or shorted, Sliding Roof Control ECU circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B2551 indicates Pulse Width Modulation Motor Right Power Supply Circuit Malfunction.
Common causes: Common causes include Faulty Sliding Roof Control ECU, Sliding Roof Control ECU harness is open or shorted, Sliding Roof Control ECU circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 1,008

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Dec 26, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2551 Description

This circuit indicates the roof motor, luggage motor or luggage closer motor depending on which motor is being used.

OBDII Code B2551 - Pulse Width Modulation Motor Right Power Supply Circuit Malfunction - AutoCodes.com — B2551 Code - Pulse Width Modulation Motor Right Power Supply Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC B2551?

Faulty Sliding Roof Control ECU
Sliding Roof Control ECU harness is open or shorted
Sliding Roof Control ECU circuit poor electrical connection

How to Fix the DTC B2551?

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 B2551 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 B2551 code?

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Need Help with the Code?

Get the B2551 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2551 Chrysler — Convertible Top Panel Latch Limit Switch Circuit Low
B2551 Dodge — Convertible Top Panel Latch Limit Switch Circuit Low
B2551 Infiniti — Steering Lock Unit
B2551 Lexus — Pulse Width Modulation Motor Right Power Supply Circuit Malfunction
B2551 Nissan — Steering Lock Unit

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 B2551 Code

1. What are common symptoms of OBDII code B2551?

- Common symptoms include issues with power windows, power mirrors, or other power accessories on the right side of the vehicle.

2. What can cause the OBDII code B2551 to trigger?

- The code can be triggered by a malfunction in the pulse width modulation motor right power supply circuit, which may be caused by wiring issues, a faulty motor, or a blown fuse.

3. How can I diagnose the cause of OBDII code B2551?

- Diagnosing the issue may involve checking the wiring harness for damage, testing the motor for proper functionality, and inspecting the fuse related to the circuit.

4. Can I still drive my vehicle with OBDII code B2551 present?

- It is generally safe to drive the vehicle with this code, but you may experience issues with power accessories on the right side of the vehicle until the problem is resolved.

5. How can I repair OBDII code B2551?

- Repairing the issue may involve repairing or replacing damaged wiring, replacing the faulty motor, or replacing a blown fuse in the power supply circuit.

6. Is it necessary to reset the OBDII code B2551 after making repairs?

- It is recommended to reset the code using an OBDII scanner after making repairs to ensure the issue has been resolved and to clear the fault code from the system.

7. Are there any common mistakes to avoid when dealing with OBDII code B2551?

- Common mistakes to avoid include overlooking damaged wiring, ignoring intermittent issues with power accessories, and failing to check related fuses.

8. Can extreme temperatures affect the occurrence of OBDII code B2551?

- Extreme temperatures can potentially impact the occurrence of this code, especially if there are existing wiring issues that are exacerbated by temperature changes.

9. How long does it typically take to repair OBDII code B2551?

- The repair time can vary depending on the exact cause of the issue, but it may take anywhere from 30 minutes to a few hours to diagnose and repair the problem.

10. Is it possible for the OBDII code B2551 to reappear after being reset?

- If the underlying issue causing the code is not properly addressed, the code may reappear after being reset. It is important to thoroughly diagnose and repair the problem to prevent recurrence.