Deutz-Fahr T99 – Transmission Control Unit (TCU) / Shuttle ECU: EEPROM checksum error

The control unit has detected an internal memory validation error, usually occurring during configuration or when the module attempts to read its sequence data/parameters.

• Agroplus 310, 320, 410, and 420 Profiline series tractors
• Agrofarm Series (85, 100, 410, 420, and 430)
• Series 5
• SAME Explorer 90

1. 1

   Verify if the tractor's transmission/shuttle commissioning was recently interrupted or not completed

2. 2

   Check the CAN Bus network for accompanying timeout messages (such as T101 or T102) which indicate a data transmission error between the engine ECU, TCU, and instrument panel

3. 3

   Inspect the wiring harness and connections between the transmission ECU and the instrument panel for corrosion or loose pins that could cause voltage drops or communication timeouts

1. 1

   Repeat the Commissioning Procedure

   Connect the diagnostic tool and attempt to re-run the tractor's transmission/shuttle commissioning and calibration procedure to rewrite the configuration data to the EEPROM.

2. 2

   Clear Codes and Test

   Once the calibration is complete, clear the fault codes and cycle the tractor's ignition to see if the T99 code returns.

3. 3

   Replace the TCU

   If the commissioning procedure fails, or if the T99 code immediately returns, the EEPROM chip inside the control unit has suffered a permanent hardware failure. You must replace the Transmission Control Unit (TCU) / Shuttle ECU.