B2790 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 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.
Code B2790 Description
What are the Possible Causes of the DTC B2790?
- 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?
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 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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Information for Specific Makes
- B2790 Lexus — ID Code Box EEPROM Malfunction
- B2790 Scion — ID Code Box EEPROM Malfunction
- B2790 Toyota — ID Code Box EEPROM Malfunction
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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