AutoCodes – Toyota – B1207 Toyota

B1207 Toyota Code - Multiplex Communication System

Quick Answer

The Certification ECU communicates with the Transponder Key to verified that the Key has been registered to the vehicle. Common causes include Faulty Certification ECU, Certification ECU harness is open or shorted, Certification ECU circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: B1207 Toyota indicates Multiplex Communication System.
Common causes: Common causes include Faulty Certification ECU, Certification ECU harness is open or shorted, Certification ECU circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 9,382

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 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 B1207 Toyota Description

The Certification ECU communicates with the Transponder Key to verified that the Key has been registered to the vehicle. The Engine Control Module (ECM) sets the ODBII code when communication between the Certification ECU and gateway ECU stops for more than 10 seconds.

OBDII Code B1207 Toyota - Multiplex Communication System - AutoCodes.com — B1207 Toyota Code - Multiplex Communication System

What does this mean?

What are the Possible Causes of the DTC B1207 Toyota?

Faulty Certification ECU
Certification ECU harness is open or shorted
Certification ECU circuit poor electrical connection

How to Fix the DTC B1207 Toyota?

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 B1207 Toyota 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 B1207 Toyota code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1207 Toyota code diagnosed by a professional: Find a repair shop in your area

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 B1207 Toyota Code

1. What are the common symptoms of OBDII code B1207 Toyota related to the Multiplex Communication System?

- Common symptoms include issues with various electronic components like the power windows, power door locks, or interior lights not functioning properly.

2. What are the possible causes of OBDII code B1207 Toyota?

- Possible causes of this code may include a malfunctioning Multiplex Communication System ECU, wiring issues, or faulty electronic components connected to the system.

3. How can I diagnose the source of OBDII code B1207 Toyota?

- To diagnose the issue, you can use a scan tool to retrieve the trouble codes, inspect the wiring for any visible damage, and perform a thorough check of the electronic components connected to the Multiplex Communication System.

4. What are some repair tips for addressing OBDII code B1207 Toyota?

- Repair tips may include checking and repairing any damaged wiring, ensuring proper connections of electronic components, and resetting the fault codes after making necessary repairs.

5. Can OBDII code B1207 Toyota be fixed without professional help?

- While some basic troubleshooting steps can be taken by DIY enthusiasts, fixing this code may require specialized knowledge and equipment, making professional help advisable for accurate diagnosis and repair.

6. Is it safe to continue driving with OBDII code B1207 Toyota present?

- It is generally not recommended to drive with this code active, as it may affect the proper functioning of essential electronic systems in the vehicle, potentially compromising safety and performance.

7. How much does it typically cost to repair OBDII code B1207 Toyota?

- The cost of repairing this code can vary depending on the underlying cause, parts needed for replacement, and labor charges. It is advisable to consult with a professional mechanic for an accurate estimate.

8. Can a faulty battery trigger OBDII code B1207 Toyota?

- While a faulty battery may not directly cause this specific code, it can lead to electrical issues that may affect the Multiplex Communication System and trigger related trouble codes.

9. Are there any preventive measures to avoid OBDII code B1207 Toyota in the future?

- Regular maintenance checks, timely repairs of any electrical issues, and avoiding overloading the vehicle's electrical system can help prevent the occurrence of this code in the future.

10. How long does it typically take to repair OBDII code B1207 Toyota?

- The repair time for this code can vary based on the complexity of the underlying issue, availability of parts, and the mechanic's expertise. It is best to consult with a professional for an accurate timeframe.