AutoCodes – Generic – B2789

B2789 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 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 3,568

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 Jan 27, 2020

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

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

What does this mean?

What are the Possible Causes of the DTC B2789?

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?

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 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 code?

Need more information on how to fix the B2789 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2789 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2789 Lexus — No Response From ID BOX
B2789 Nissan — Electric Compressor Over Loaded
B2789 Scion — No Response From ID BOX
B2789 Toyota — No Response From ID BOX

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 Code

1. What are the common symptoms of OBDII code B2789 (No Response From ID BOX)?

- Common symptoms include difficulty starting the vehicle, issues with the anti-theft system, and the vehicle going into theft mode.

2. What are some possible causes of OBDII code B2789?

- Possible causes include a faulty ID BOX, wiring issues, a defective key, or a communication problem between the ID BOX and the vehicle's computer.

3. How can I diagnose the source of OBDII code B2789?

- To diagnose the issue, it is recommended to perform a thorough inspection of the ID BOX, check the wiring connections, test the key fob, and use a diagnostic scanner to retrieve more specific information.

4. Is it safe to continue driving with OBDII code B2789 present?

- It is not recommended to continue driving with this code present, as it may lead to further issues with the vehicle's anti-theft system and potentially cause starting problems.

5. How can I repair OBDII code B2789?

- Repairing this code typically involves replacing the faulty ID BOX, repairing any damaged wiring, ensuring the key is functioning properly, and clearing the diagnostic trouble codes.

6. Can I reset OBDII code B2789 without fixing the underlying issue?

- While you can clear the code temporarily, it is important to address the underlying issue causing the code to prevent further problems with the vehicle's anti-theft system.

7. How much does it cost to repair OBDII code B2789?

- The cost of repairing this code can vary depending on the specific issue, but it may involve replacing the ID BOX, which can range from $100 to $300, plus labor costs.

8. Can a DIY enthusiast fix OBDII code B2789 at home?

- Depending on the specific cause of the code, some DIY enthusiasts may be able to address the issue by following repair guides and using basic tools. However, more complex issues may require professional assistance.

9. Are there any preventive measures to avoid OBDII code B2789 in the future?

- To prevent OBDII code B2789, it is recommended to regularly inspect the ID BOX and wiring connections, ensure the key is in good condition, and address any issues promptly to avoid further complications.

10. How long does it take to repair OBDII code B2789?

- The repair time for OBDII code B2789 can vary depending on the extent of the issue and the availability of parts. In general, it may take a few hours to a day to diagnose and repair the problem.