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Engine-Codes – Generic – B2790

B2790 Code - ID Code Box EEPROM Malfunction

Quick Answer

The B2790 diagnostic trouble code (DTC) indicates an issue with the ID Code Box EEPROM in the vehicle. Common causes include Electrical issues such as wiring problems or a faulty battery, Component failure in the ID Code Box, Programming errors in the immobilizer system. 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 indicates ID Code Box EEPROM Malfunction.
Common causes
Common causes include Electrical issues such as wiring problems or a faulty battery, Component failure in the ID Code Box, Programming errors in the immobilizer system.
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 15, 2024
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Code B2790 Description

The B2790 diagnostic trouble code (DTC) indicates an issue with the ID Code Box EEPROM in the vehicle. The ID Code Box is a component that stores and manages security codes for the vehicle's immobilizer system. The immobilizer system is designed to prevent unauthorized access to the vehicle by requiring a specific code to start the engine.

OBDII Code B2790 - ID Code Box EEPROM Malfunction
B2790 Code - ID Code Box EEPROM Malfunction

Common Causes of B2790

  1. Electrical issues such as wiring problems or a faulty battery
  2. Component failure in the ID Code Box
  3. Programming errors in the immobilizer system
  4. Water damage or corrosion affecting the ID Code Box
  5. Faulty key fob or key

Symptoms of B2790

  1. Engine not starting
  2. Vehicle stalling unexpectedly
  3. Immobilizer system not recognizing key fob or key
  4. Security lockout mode activated

How to Fix B2790

  1. Diagnose the issue by using a scan tool to retrieve the specific DTC and identify the problem with the ID Code Box EEPROM.
  2. Inspect the wiring and connections related to the ID Code Box for any damage or corrosion.
  3. Replace the ID Code Box if it is determined to be faulty, ensuring that the new unit is programmed correctly to work with the vehicle's immobilizer system.
  4. Clear the DTC from the vehicle's computer system to reset the immobilizer system and allow the vehicle to start properly.
  5. Test the vehicle to ensure that the issue has been resolved and that the engine starts without any problems.

Cost to Fix B2790

The typical repair costs for addressing a B2790 ID Code Box EEPROM malfunction can vary depending on the specific vehicle make and model, as well as the labor rates in different locations. On average, the repair costs for this issue can range from $200 to $500, including parts and labor. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate. Additionally, rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more competitive pricing.

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Code B2790 Information for Specific Makes

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 Code

1. What does OBDII code B2790 mean?

B2790 indicates an "ID Code Box EEPROM Malfunction," which means there is an issue with the EEPROM (Electrically Erasable Programmable Read-Only Memory) in the ID code box, often used in the vehicle's immobilizer system.

2. What are the common symptoms of code B2790?

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

3. What causes the B2790 code to appear?

Common causes include a faulty ID code box, corrupted EEPROM memory, damaged wiring or connectors, or issues with the key fob programming.

4. How is code B2790 diagnosed?

A technician will use a scan tool to verify the code, inspect the wiring and connectors for damage, and test the ID code box and EEPROM for faults.

5. Can a weak or dead key fob battery trigger code B2790?

No, a weak or dead key fob battery typically won’t trigger this code, but it can cause similar starting issues. Ensure the key fob is working before diagnosing further.

6. Can I continue driving with the B2790 code active?

No, in most cases, the vehicle will not start if this code is active due to the immobilizer system being compromised.

7. How can I fix the B2790 code?

Repairs may involve replacing the ID code box, reprogramming the EEPROM, repairing damaged wiring, or reprogramming the vehicle keys.

8. Is the B2790 code unique to specific car brands?

While this code commonly appears in Toyota and Lexus vehicles, the issue can occur in other brands with similar immobilizer systems.

9. How much does it cost to repair code B2790?

Repair costs can vary widely but may range from $200 to $800, depending on whether the ID code box needs replacement or reprogramming.

10. Can disconnecting the battery clear the B2790 code?

No, disconnecting the battery will not clear this code. The underlying issue with the ID code box or EEPROM must be resolved for the code to clear.

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