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Bent or recessed pins in the vehicle’s OBD port or the KESS cable will break the CAN or K-Line connection.
: In some cases, manually selecting a different protocol in the Kess V2 software might help establish a connection. However, be cautious and refer to the vehicle's documentation to avoid using an incompatible protocol.
A mismatch, corruption, or failure in any one of these three pillars will result in the error.
Which specific are you trying to read?
If you are still experiencing issues after trying these steps, let me know the following details to narrow down the problem:
| Problem | Likely fix | |--------|-------------| | Protocol not found on most cars | Reflash firmware with correct version; check USB chip (clone may use counterfeit FTDI) | | Works sometimes | Bad power supply or loose OBD connector | | CAN protocol only fails | Check CAN transceiver chip inside Kess (e.g., MCP2551) | | K-Line fails | Verify K-Line transistor and 12V pull-up |
If you are using a cloned KESS v2 (a replica unit), the "Protocol Not Found" error is extremely common because the hardware often lacks the necessary GPT crypto chip to unlock modern ECU security layers (like Bosch MDG1/TC17xx). In this case, the error is hardware limitation, not software.
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Kess V2 Protocol Not Found [2021] [Instant – 2024]
Bent or recessed pins in the vehicle’s OBD port or the KESS cable will break the CAN or K-Line connection.
: In some cases, manually selecting a different protocol in the Kess V2 software might help establish a connection. However, be cautious and refer to the vehicle's documentation to avoid using an incompatible protocol.
A mismatch, corruption, or failure in any one of these three pillars will result in the error.
Which specific are you trying to read?
If you are still experiencing issues after trying these steps, let me know the following details to narrow down the problem:
| Problem | Likely fix | |--------|-------------| | Protocol not found on most cars | Reflash firmware with correct version; check USB chip (clone may use counterfeit FTDI) | | Works sometimes | Bad power supply or loose OBD connector | | CAN protocol only fails | Check CAN transceiver chip inside Kess (e.g., MCP2551) | | K-Line fails | Verify K-Line transistor and 12V pull-up |
If you are using a cloned KESS v2 (a replica unit), the "Protocol Not Found" error is extremely common because the hardware often lacks the necessary GPT crypto chip to unlock modern ECU security layers (like Bosch MDG1/TC17xx). In this case, the error is hardware limitation, not software.
