AutoCodes – Lexus – B2789 Lexus

B2789 Lexus Code - No Response From ID BOX

Quick Answer

This Diagnostic Trouble Code (DTC) is stored when Local Interconnect Network (LIN) communication between the Certification ECU (Smart Key ECU Assembly) and ID Code Box (Immobilizer Code ECU) stops for 10 seconds or more. Common causes include Faulty ID Code Box (Immobilizer Code ECU), ID Code Box (Immobilizer Code ECU) harness is open or shorted, ID Code Box (Immobilizer Code 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: B2789 Lexus indicates No Response From ID BOX.
Common causes: Common causes include Faulty ID Code Box (Immobilizer Code ECU), ID Code Box (Immobilizer Code ECU) harness is open or shorted, ID Code Box (Immobilizer Code 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 3,894

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jan 27, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2789 Lexus Description

OBDII Code B2789 Lexus - No Response From ID BOX - AutoCodes.com — B2789 Lexus Code - No Response From ID BOX

What does this mean?

What are the Possible Causes of the DTC B2789 Lexus?

Faulty ID Code Box (Immobilizer Code ECU)
ID Code Box (Immobilizer Code ECU) harness is open or shorted
ID Code Box (Immobilizer Code ECU) circuit poor electrical connection
Faulty Certification ECU (Smart Key ECU Assembly)

How to Fix the DTC B2789 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 B2789 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.

Need more information about the B2789 Lexus code?

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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 B2789 Lexus Code

1. What are the common symptoms of OBDII code B2789 in a Lexus indicating "No Response From ID BOX"?

- Common symptoms include key fob not working, engine not starting, and the vehicle going into anti-theft mode.

2. What are the possible causes of OBDII code B2789 in a Lexus?

- Possible causes include a faulty ID BOX, issues with the key fob, wiring problems, or a communication error between components.

3. How can I diagnose the root cause of OBDII code B2789 in my Lexus?

- Start by checking the key fob battery, ensuring there are no wiring issues, and confirming the ID BOX functionality using diagnostic tools.

4. Can I fix OBDII code B2789 in my Lexus by resetting the system?

- Sometimes, resetting the system by disconnecting the battery for a few minutes may clear the code, but it's crucial to address the underlying issue.

5. Is it safe to drive my Lexus with OBDII code B2789 present?

- It's not recommended to drive the vehicle with this code as it can lead to starting issues or the vehicle going into anti-theft mode unexpectedly.

6. How much does it typically cost to repair OBDII code B2789 in a Lexus?

- The cost of repair can vary depending on the root cause, but it may involve replacing the ID BOX or addressing wiring issues, which can range from a few hundred to over a thousand dollars.

7. Can I fix OBDII code B2789 in my Lexus myself, or should I seek professional help?

- While some simple checks like the key fob battery can be done DIY, diagnosing and repairing complex issues related to this code may require professional expertise.

8. Will OBDII code B2789 cause any long-term damage to my Lexus if left unaddressed?

- Ignoring this code may lead to further starting issues or the vehicle getting stuck in anti-theft mode, potentially causing inconvenience and safety concerns.

9. How long does it usually take to repair OBDII code B2789 in a Lexus?

- The repair time can vary based on the complexity of the issue, but it typically takes a few hours to a day to diagnose and fix the problem related to this code.

10. Are there any preventive measures to avoid encountering OBDII code B2789 in my Lexus?

- Regularly checking the key fob battery, ensuring proper maintenance of the vehicle's electrical system, and promptly addressing any warning signs can help prevent this code from appearing.