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Engine-Codes – Scion – B2789 Scion

B2789 Scion Code - No Response From ID BOX

Quick Answer

The B2789 diagnostic trouble code (DTC) for Scion vehicles indicates that there is no response from the ID BOX. Common causes include Faulty ID BOX, Issues with the transponder chip in the key, Wiring or connection issues between the ID BOX and ECM. 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 Scion indicates No Response From ID BOX.
Common causes
Common causes include Faulty ID BOX, Issues with the transponder chip in the key, Wiring or connection issues between the ID BOX and ECM.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code B2789 Scion Description

The B2789 diagnostic trouble code (DTC) for Scion vehicles indicates that there is no response from the ID BOX. The ID BOX is a component of the vehicle's immobilizer system, which is designed to prevent unauthorized access to the vehicle. When the engine control module (ECM) sends a signal to the ID BOX and does not receive a response, it triggers this code. This can lead to the vehicle not starting or running properly, as the immobilizer system may prevent the engine from starting.

OBDII Code B2789 Scion - No Response From ID BOX
B2789 Scion Code - No Response From ID BOX

Common Causes of B2789 Scion

  1. Faulty ID BOX
  2. Issues with the transponder chip in the key
  3. Wiring or connection issues between the ID BOX and ECM
  4. ECM malfunction
  5. Low battery voltage affecting communication between components

Symptoms of B2789 Scion

  1. Engine cranks but does not start
  2. Vehicle does not respond to key fob
  3. Security light stays illuminated on the dashboard
  4. Vehicle goes into anti-theft mode and will not start

How to Fix B2789 Scion

  1. Begin by checking the battery voltage to ensure it is within the proper range.
  2. Inspect the wiring and connections between the ID BOX and ECM for any damage or corrosion.
  3. Test the transponder chip in the key to ensure it is functioning correctly.
  4. If necessary, replace the ID BOX or ECM with a new unit.
  5. Clear the DTC and perform a relearn procedure to synchronize the new components with the vehicle's immobilizer system.

Cost to Fix B2789 Scion

The cost of repairing a B2789 code can vary depending on the specific cause of the issue. In general, replacing the ID BOX or ECM can range from $200 to $600, including parts and labor. Additional costs may be incurred if wiring repairs or key programming are necessary. It is recommended to consult with a qualified mechanic or dealership for an accurate cost estimate based on your vehicle's make and model. Keep in mind that labor rates can vary, so it's advisable to check local rates for a more precise estimate.

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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 Scion Code

1. What does OBDII code B2789 mean on a Scion?

Code B2789 indicates "No Response From ID BOX," meaning the vehicle’s immobilizer system is not communicating properly with the ID box.

2. What are the symptoms of code B2789 in a Scion?

Common symptoms include the engine not starting, the immobilizer warning light staying on, or intermittent starting issues.

3. What causes the B2789 code in a Scion?

The code can be caused by a faulty ID box, wiring or connection issues, a damaged key fob, or a malfunctioning immobilizer system.

4. Can a weak or dead key fob battery cause code B2789?

Yes, a weak or dead key fob battery can prevent communication with the ID box, triggering the B2789 code.

5. How do I diagnose code B2789 on my Scion?

Start by checking the key fob battery, inspecting the wiring and connectors to the ID box, and using a scan tool to verify the fault.

6. Where is the ID box located in a Scion?

The ID box is typically located under the dashboard near the steering column but may vary by model.

7. Can I clear the B2789 code without fixing the issue?

Clearing the code without addressing the root cause will likely result in the code returning and persistent starting issues.

8. How much does it cost to fix code B2789 on a Scion?

Repair costs vary but may range from $100 to $500 depending on whether the issue is with the key fob, wiring, or ID box replacement.

9. Can a dealership reprogram the ID box to fix code B2789?

Yes, a dealership can reprogram or replace the ID box to resolve the issue if reprogramming is necessary.

10. Is it safe to drive with code B2789 active?

No, it may prevent the vehicle from starting or cause intermittent starting problems, making it unreliable to drive.

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