Check the KESS V2 protocol list. If the ECU is marked as "Boot" or "BDM" only, you cannot read it via the OBD port. You will need to open the ECU and use a BDM frame or Boot wires.
Carefully unscrew the Kess V2 casing to access the internal board.
Understanding the root causes of this error and knowing how to systematically troubleshoot it can save hours of downtime and prevent potential damage to the vehicle's electronics. Direct Answer: What Causes "Protocol Not Found"? kess v2 protocol not found
KESS V2 requires a stable, high-voltage threshold (usually between 12.5V and 13.5V) to initiate a wake-up protocol with an ECU. If you are reading via OBD2 and the vehicle battery is low, or if you are bench-testing without an adequate external power supply, the protocol initialization will fail.
Keep a separate OBD breakout box with LEDs. If the K-Line or CAN LEDs don’t flash when you click "Identify," the problem is 100% physical (wiring, voltage, or dead OBD port). Check the KESS V2 protocol list
Reinstall a compatible version (e.g., K-Suite 2.06 or 2.23, depending on your firmware) along with . Troubleshooting Steps
If the software is correct and the SD card is fresh, the physical board may need attention. Replace the Filters Carefully unscrew the Kess V2 casing to access
Remember that clone devices, while affordable, require more careful maintenance than genuine units. Regular SD card backups and avoiding internet connections will prevent most protocol errors from occurring in the first place. With proper care and troubleshooting knowledge, your Kess V2 can be a reliable tool for all your ECU tuning needs.
Are you using an or a red/green clone device ?
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If the software reinstallation does not work, the issue is likely within the device's internal TF/MicroSD card. Carefully open the KESS V2 plastic casing.