AutoCodes – Honda – B1128 Honda

B1128 Honda Code - Driver Side Door Lock Switch Signal Error

Quick Answer

The Door Multiplex Control Unit monitors the Driver Side Door Lock Switch. Common causes include Faulty Driver Side Door Lock Switch, Driver Side Door Lock Switch harness is open or shorted, Driver Side Door Lock Switch 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: B1128 Honda indicates Driver Side Door Lock Switch Signal Error.
Common causes: Common causes include Faulty Driver Side Door Lock Switch, Driver Side Door Lock Switch harness is open or shorted, Driver Side Door Lock Switch 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 5,293

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 19, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1128 Honda Description

The Door Multiplex Control Unit monitors the Driver Side Door Lock Switch. The Door Multiplex Control Unit sets the OBDII code when the Driver Side Door Lock Switch is not to factory specifications.

OBDII Code B1128 Honda - Driver Side Door Lock Switch Signal Error - AutoCodes.com — B1128 Honda Code - Driver Side Door Lock Switch Signal Error

What does this mean?

What are the Possible Causes of the DTC B1128 Honda?

Faulty Driver Side Door Lock Switch
Driver Side Door Lock Switch harness is open or shorted
Driver Side Door Lock Switch circuit poor electrical connection
Faulty Door Multiplex Control Unit

How to Fix the DTC B1128 Honda?

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 B1128 Honda 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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Need more information on how to fix the B1128 Honda code? Get Access to Factory Service Manuals

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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 B1128 Honda Code

1. What are the common symptoms of OBDII code B1128 for a Honda related to the driver side door lock switch signal error?

- Common symptoms include the inability to lock or unlock the driver side door using the switch, erratic behavior of the door lock system, or a persistent door ajar warning.

2. What can cause the OBDII code B1128 in a Honda indicating a driver side door lock switch signal error?

- The code B1128 can be triggered by a faulty driver side door lock switch, a damaged wiring harness, or a malfunctioning door lock actuator.

3. How can I diagnose the OBDII code B1128 on my Honda if I suspect a driver side door lock switch signal error?

- To diagnose the issue, you can perform a visual inspection of the door lock switch and wiring, use a multimeter to test for continuity, and scan the vehicle's computer for specific error codes.

4. Is it safe to continue driving my Honda with the OBDII code B1128 related to the driver side door lock switch signal error?

- While the vehicle may still be operable, it is recommended to address the issue promptly to prevent potential security risks and further damage to the door lock system.

5. What are some DIY repair tips for fixing the OBDII code B1128 on a Honda caused by a driver side door lock switch signal error?

- DIY repair tips may include checking and cleaning the door lock switch contacts, repairing damaged wiring, or replacing the faulty door lock actuator if necessary.

6. Can a professional mechanic help me resolve the OBDII code B1128 on my Honda related to the driver side door lock switch signal error?

- Yes, a professional mechanic can accurately diagnose the issue, perform necessary repairs or replacements, and reset the error code to resolve the driver side door lock switch signal error.

7. How much can I expect to spend on repairs for the OBDII code B1128 in a Honda due to a driver side door lock switch signal error?

- Repair costs for the OBDII code B1128 can vary depending on the exact cause of the issue, but expenses may include parts replacement, labor fees, and diagnostic charges.

8. Are there any preventive measures I can take to avoid encountering the OBDII code B1128 on my Honda related to the driver side door lock switch signal error in the future?

- Regularly inspecting and maintaining the door lock system, promptly addressing any issues with the door lock switch or wiring, and avoiding excessive force when operating the door lock switch can help prevent the recurrence of the error code.