Navigate to the vehicle selection screen: Select or Truck/Van →right arrow Mercedes →right arrow choose your matching chassis (e.g., Sprinter or W166 ML). Select the corresponding engine variant and click on the Bosch EDC17CP57 protocol choice.
Some users have reported that Ktag 7.020 only reads the backup (e.g., EEPROM) for EDC17CP57, not the full flash, and refuses to write modified files.
Ktag V7.020 (Firmware version 7.020 is mandatory for stable GPT protocol support).
: GPT Connection Cable (General Purpose Timer) for Tricore microcontrollers. How to read Mercedes EDC17CP57 with Ktag 7.020 GPT cable
: Must have an unrestricted firmware layer supporting GPT protocols.
The is a Bosch ECU used in Mercedes-Benz diesel engines (e.g., OM651, OM642 post-2012). KTAG 7.020 (clone) is a common tool for boot mode reading/writing. GPT cable — in this context — likely refers to the 20-pin GPT (General Purpose Trigger) adapter used for connecting to the ECU’s programming port, not a “ChatGPT cable.”
Reading the Bosch EDC17CP57 ECU on Mercedes vehicles with K-TAG 7.020 requires a GPT connection (Protocol 800) to bypass TC1793 password protection . The process involves establishing a secure connection using cables F32GN037C and F34NTA15, soldering the boot pin, and ensuring the internet is disconnected to prevent unauthorized updates . For more details, visit OBDII365 Blog . Navigate to the vehicle selection screen: Select or
Before starting, ensure you have:
Disclaimer: Modifying ECUs may violate emissions regulations in your region. This guide is for educational and off-road motorsport use only.
Choose (or the specific active prompt number specified by your Ktag software version for Mercedes GPT). Ktag V7
| GPT Pin (20-pin) | ECU Pin | Signal | |----------------|---------|--------| | 1 | 5.02 | K-Line (boot) | | 2 | 4.62 | CAN High | | 3 | 4.63 | CAN Low | | 4 | 1.40 | +12V (permanent) | | 5 | 1.41 | +12V (ignition) | | 6 | 1.01 | GND | | 7 | 1.02 | GND | | 8 | 5.01 | Boot Pin (to GND for boot mode) |
The interface, combined with the correct GPT cable, is a reliable solution for reading and writing on this ECU model. The GPT cable provides essential signals like GPT1 and GPT2 that enter the ECU in a specific mode for programming.