AutoCodes – Toyota – B2790 Toyota

B2790 Toyota Code - ID Code Box EEPROM Malfunction

Quick Answer

This Diagnostic Trouble Code (DTC) is stored when the ID Code Box (Immobiliser Code ECU) detects an internal malfunction. Common causes include Faulty ID Code Box (Immobiliser Code ECU), ID Code Box harness is open or shorted, ID Code Box 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: B2790 Toyota indicates ID Code Box EEPROM Malfunction.
Common causes: Common causes include Faulty ID Code Box (Immobiliser Code ECU), ID Code Box harness is open or shorted, ID Code Box 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 3,144

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 Feb 06, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2790 Toyota Description

This Diagnostic Trouble Code (DTC) is stored when the ID Code Box (Immobiliser Code ECU) detects an internal malfunction.

OBDII Code B2790 Toyota - ID Code Box EEPROM Malfunction - AutoCodes.com — B2790 Toyota Code - ID Code Box EEPROM Malfunction

What does this mean?

What are the Possible Causes of the DTC B2790 Toyota?

Faulty ID Code Box (Immobiliser Code ECU)
ID Code Box harness is open or shorted
ID Code Box circuit poor electrical connection

How to Fix the DTC B2790 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 B2790 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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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 B2790 Toyota Code

1. What does the OBDII code B2790 mean on a Toyota?

The code B2790 indicates a malfunction in the ID code box EEPROM, which stores key identification data for the vehicle's immobilizer system.

2. What are the common symptoms of a B2790 code?

Symptoms may include the engine not starting, the immobilizer warning light staying on, and issues with key recognition.

3. What causes the B2790 code to appear on a Toyota?

This code can be triggered by corrupted EEPROM data, a faulty ID code box, electrical issues like damaged wiring or connectors, or improper programming of the immobilizer system.

4. Can a weak or faulty battery cause the B2790 code?

Yes, a weak or failing battery can cause voltage drops that may corrupt the EEPROM data, leading to the B2790 code.

5. How do you diagnose the B2790 code?

Diagnosis involves scanning for codes with an OBDII scanner, inspecting the wiring and connectors to the ID code box, and checking the ID code box for proper operation or signs of damage.

6. Can the B2790 code be cleared without repairs?

Simply clearing the code without fixing the underlying issue is unlikely to resolve the problem, as the malfunction will likely recur.

7. What repairs are needed to fix the B2790 code?

Repairs may include reprogramming or replacing the ID code box, repairing damaged wiring, or ensuring proper key registration with the immobilizer system.

8. How much does it cost to fix a B2790 code on a Toyota?

The repair cost can vary, but replacing the ID code box and reprogramming it typically ranges from $200 to $600, depending on labor rates and part prices.

9. Can I fix the B2790 code myself?

If you have experience with automotive electrical systems, you can inspect wiring and connectors. However, replacing or reprogramming the ID code box often requires specialized tools and expertise.

10. Does a B2790 code always mean the ID code box is faulty?

Not necessarily. The issue could also stem from wiring problems, a key programming error, or a malfunction in a related component of the immobilizer system.