AutoCodes – Lexus – B126A Lexus

B126A Lexus Code - Remote Engine Starter ECU Communication Stop

Quick Answer

The Main Body ECU (Multiplex Network Body ECU) communicates with the accessory ECU and accessory BERKES. Common causes include Faulty Main Body ECU (Multiplex Network Body ECU), Main Body ECU harness is open or shorted, Main Body 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: B126A Lexus indicates Remote Engine Starter ECU Communication Stop.
Common causes: Common causes include Faulty Main Body ECU (Multiplex Network Body ECU), Main Body ECU harness is open or shorted, Main Body 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 3,213

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 Nov 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B126A Lexus Description

The Main Body ECU (Multiplex Network Body ECU) communicates with the accessory ECU and accessory BERKES. This Diagnostic Trouble Code (DTC) is output when there is no communication between the Main Body ECU (Multiplex Network Body ECU) and accessory ECU for 10 seconds or more.

OBDII Code B126A Lexus - Remote Engine Starter ECU Communication Stop - AutoCodes.com — B126A Lexus Code - Remote Engine Starter ECU Communication Stop

What does this mean?

What are the Possible Causes of the DTC B126A Lexus?

Faulty Main Body ECU (Multiplex Network Body ECU)
Main Body ECU harness is open or shorted
Main Body ECU circuit poor electrical connection

How to Fix the DTC B126A Lexus?

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 B126A Lexus 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 B126A Lexus 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 B126A Lexus Code

1. What are the common symptoms of OBDII code B126A in a Lexus related to the Remote Engine Starter ECU Communication Stop?

- The common symptoms include the remote engine starter not functioning, inability to start the engine remotely, and potential issues with keyless entry.

2. What are the possible causes of OBDII code B126A in a Lexus?

- Possible causes include a malfunctioning remote engine starter ECU, wiring or connection issues, or a communication breakdown between the ECU and other vehicle systems.

3. How can I diagnose the cause of OBDII code B126A in my Lexus?

- To diagnose the issue, you can use a diagnostic scanner to retrieve the trouble codes, check the wiring and connections related to the remote engine starter ECU, and perform a thorough visual inspection for any visible damage.

4. Is it safe to continue driving my Lexus with OBDII code B126A present?

- While the vehicle may still be operable, it is recommended to address the issue promptly to avoid potential inconvenience or further complications with the remote engine starter functionality.

5. Can I repair OBDII code B126A in my Lexus by myself?

- Depending on your automotive repair skills and access to tools, you may be able to address simpler causes like loose connections. However, more complex issues may require professional diagnosis and repair.

6. Are there any temporary solutions to reset OBDII code B126A in my Lexus?

- In some cases, disconnecting the vehicle's battery for a few minutes can reset the trouble codes and potentially resolve temporary communication issues. However, this may not address the underlying cause.

7. How much does it typically cost to repair OBDII code B126A in a Lexus?

- The cost of repairs can vary depending on the cause of the issue and whether you choose to address it yourself or seek professional help. Costs may range from a simple connector repair to a replacement of the remote engine starter ECU.

8. Can extreme weather conditions affect the occurrence of OBDII code B126A in a Lexus?

- Yes, extreme temperatures or moisture levels can impact the electronic components involved in the remote engine starter system, potentially leading to communication errors and triggering the B126A trouble code.

9. Will OBDII code B126A cause my Lexus to fail an emissions test?

- While the code itself may not directly affect emissions, it is important to ensure all vehicle systems are functioning properly to pass an emissions test. Addressing the code promptly is recommended.

10. How long does it usually take to repair OBDII code B126A in a Lexus?

- The repair time can vary based on the complexity of the issue and the availability of parts. Simple fixes like reconnecting wires may take a short time, while more involved repairs could require several hours or even days.