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Bosch MED17.1 - TC1796

Bosch MED17.1 - TC1796 Support & FAQ

Bosch MED17.1 - TC1796

Errors

Find quick solutions to the most common issues encountered when programming the Bosch MED17.1 TC1796.

[UART_CAN API] Failed to read TrbnSpec length bytes

A communication error during Bench programming typically caused by hardware incompatibilities or specific crystal frequencies.

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Concerns vehicles from

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[UART_CAN API] Failed to read TrbnSpec length bytes : [UART_CAN API] No data to read : KWP Ping RX error

Method: BENCH

Issue: The programming tool fails to establish a stable communication link with the ECU, resulting in a Ping RX error during the identification phase.

Solution
  • Verify that all bench pins are correctly seated and making proper contact.
  • Check your power supply voltage; ensure it is stable at 13.5V - 14V.
  • Acknowledge that a small percentage of MED17.1 TC1796 units are hardware-locked or use a non-standard frequency that prevents programming.
  • If the connection remains impossible after multiple attempts, please Contact our technical support with your logs.
To understand more

This error occurs because a limited production run of Bosch MED17.1 units using the TC1796 processor features a different crystal frequency. This hardware variation causes a mismatch during the KWP (Keyword Protocol) handshake, leading to the "No data to read" status as the ECU fails to respond to the initialization ping.