AutoCodes – Generic – B2251

B2251 Code - Back Door Closer Switch Malfunction

Quick Answer

The Multiplex Network Door ECU receives signals from the latch switch, sector switch, pawl switch, and back door courtesy switch, which are built into the Back Door Lock Assembly. Common causes include Faulty Back Door Lock Assembly, Back Door Lock Assembly harness is open or shorted, Back Door Lock Assembly 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: B2251 indicates Back Door Closer Switch Malfunction.
Common causes: Common causes include Faulty Back Door Lock Assembly, Back Door Lock Assembly harness is open or shorted, Back Door Lock Assembly 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 5,450

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 10, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2251 Description

The Multiplex Network Door ECU receives signals from the latch switch, sector switch, pawl switch, and back door courtesy switch, which are built into the Back Door Lock Assembly. Based on these switch signals, the latch position of the back door lock assembly is determined. The Diagnostic Trouble Code (DTC) sets when a malfunction is detected in position information from the back door courtesy switch within a specified amount of time, while the back door closer is operating.

OBDII Code B2251 - Back Door Closer Switch Malfunction - AutoCodes.com — B2251 Code - Back Door Closer Switch Malfunction

What does this mean?

What are the Possible Causes of the DTC B2251?

Faulty Back Door Lock Assembly
Back Door Lock Assembly harness is open or shorted
Back Door Lock Assembly circuit poor electrical connection
Faulty Multiplex Network Door ECU

How to Fix the DTC B2251?

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 B2251 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 B2251 code?

Need more information on how to fix the B2251 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2251 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2251 Ford — Parklamp Output Relay Driver Circuit Failure
B2251 Lexus — Back Door Closer Switch Malfunction
B2251 Lincoln — Parklamp Output Relay Driver Circuit Failure
B2251 Mercury — Parklamp Output Relay Driver Circuit Failure
B2251 Toyota — Back Door Closer Switch Malfunction

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 B2251 Code

1. What are the common symptoms of OBDII code B2251 (Back Door Closer Switch Malfunction)?

- The common symptoms include the back door not closing properly, warning lights on the dashboard, and issues with the automatic closing mechanism.

2. What can cause the OBDII code B2251 to trigger?

- The code B2251 can be triggered by a faulty back door closer switch, wiring issues, or problems with the back door control module.

3. How can I diagnose the Back Door Closer Switch Malfunction causing OBDII code B2251?

- You can diagnose the issue by checking the back door closer switch for proper functioning, inspecting the wiring for any damage, and using a diagnostic scanner to retrieve the trouble codes.

4. Is it safe to drive with OBDII code B2251 active?

- It is generally safe to drive with the code B2251; however, it is recommended to address the issue promptly to avoid further damage to the back door mechanism.

5. Can I repair OBDII code B2251 on my own?

- If you have experience with automotive repairs and diagnostics, you may be able to repair the Back Door Closer Switch Malfunction causing the code B2251. However, seeking professional help is advisable for accurate diagnosis and repair.

6. What are some tips for repairing OBDII code B2251 at home?

- Some tips for repairing the code B2251 include checking the back door closer switch for proper alignment, inspecting the wiring for any loose connections, and clearing the trouble code with a diagnostic scanner after the repair.

7. How much does it cost to repair OBDII code B2251?

- The cost of repairing the code B2251 can vary depending on the underlying issue, labor rates, and the need for replacement parts. It is recommended to obtain quotes from different repair shops for an accurate estimate.

8. Can a faulty back door closer switch cause other issues in the vehicle?

- Yes, a faulty back door closer switch can cause other issues such as drainage on the vehicle's battery, malfunctioning back door operation, and potential safety hazards if the door does not close properly.

9. How long does it take to repair OBDII code B2251?

- The repair time for the code B2251 can vary depending on the exact cause of the issue and the complexity of the repair. It may take anywhere from 1 to 3 hours for a professional technician to diagnose and fix the problem.

10. Are there any preventive measures to avoid OBDII code B2251 in the future?

- To prevent OBDII code B2251, it is recommended to perform regular maintenance checks on the back door mechanism, ensure proper functioning of the back door closer switch, and address any issues promptly to avoid further damage.