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Siemens Simos12.1 - TC1797

Siemens Simos12.1 - TC1797 FAQ & Troubleshooting

Siemens Simos12.1 - TC1797

Errors

Quickly identify and resolve common issues encountered while reading or writing the Siemens Simos12.1 ECU.

Files not found

This error indicates that the required virtual read file is missing from the server database.

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71-01-02-02-01

A communication rejection occurs when the ECU detects non-original software or a third-party patch.

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Concerns vehicles from

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Files not found

Method: OBD / Recovery: BENCH

Issue: The system is unable to locate the necessary original files on the server during an OBD virtual read operation.

Solution
  • Perform a full BENCH read of the ECU to extract the physical data.
  • Save the read file to your local computer.
  • Send the extracted file to support@bflash.eu.
  • Wait for the technical team to add the file to the server for future use.
To understand more

When using OBD mode, the tool relies on a Virtual Read (VR) database. If your specific software version hasn't been indexed yet, a physical BENCH read is required to provide the server with the necessary reference data.

71-01-02-02-01

Method: OBD & BENCH

Issue: The ECU rejects the programming request because it identifies that the current software has been modified or patched by a different tool.

Solution
  • Restore the ECU to its Original (Stock) software state.
  • Ensure all third-party patches or custom tunes are removed before attempting to flash again.
  • Once the ECU is back to factory data, proceed with your tuning process as usual.
To understand more

Error 71-01-02-02-01 is a security flag. It triggers when the ECU's internal security checks fail due to unauthorized software modifications. Returning to an original file resets the security environment, allowing the bFlash tool to work correctly.