B2794 2016 Toyota RAV4 Code - Unmatched Encryption Code

B2794 indicates an "Unmatched Encryption Code," meaning there’s an issue with the communication between the vehicle's immobilizer system and the key.

The most common symptoms include the engine failing to start, the security light staying on or flashing, and the inability to use the remote key functions.

This code is typically caused by a mismatched or unprogrammed key, a faulty key fob, a malfunctioning immobilizer system, or a damaged electronic control unit (ECU).

No, a dead key fob battery alone will not trigger this code, but it may cause starting issues that mimic the symptoms of an immobilizer problem.

To fix the issue, try reprogramming the key, using a different key, or replacing the key fob. If the issue persists, inspect or replace the immobilizer system or ECU.

Clearing the code without addressing the root cause will not resolve the problem. The vehicle will likely store the code and continue to experience starting issues.

Not necessarily. The key may just need to be reprogrammed, but if it’s physically damaged, replacing it might be required.

Costs can vary. Reprogramming a key may cost $50-$150, while replacing a key or immobilizer system could range from $200-$600.

Reprogramming typically requires specialized equipment and may need to be done by a dealership or qualified locksmith.

Yes, this code usually prevents the engine from starting because the immobilizer system cannot verify the key's encryption code.