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Siemens Simos19.6 - TC297

Siemens Simos19.6 - TC297 FAQ | bFlash Support

Siemens Simos19.6 - TC297

Errors

Quickly identify and resolve the most common issues encountered when working with the Siemens Simos19.6 control unit.

Car doesn't start after writing

The vehicle fails to start immediately after a flash, potentially due to a locked immobilizer or file error.

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This software version is unknown by the server

The specific ECU software version is not yet indexed on the bFlash servers for automated handling.

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Dynomode activation error

A failure during the activation of Dynamometer mode, often caused by security gateway or hood status.

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7F-10-22

The ECU has rejected programming access because specific environmental conditions have not been satisfied.

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Concerns vehicles from

Audi Cupra Seat Skoda Volkswagen

Car doesn't start after writing

Method: OBD

Issue: The engine fails to crank or start immediately following the completion of the OBD writing process.

Solution
  • Turn off the ignition, exit the vehicle, and lock the doors for a minimum of 10 minutes.
  • This ensures the Immobilizer (Immo) system resets and clears any security flags.
  • If the car still refuses to start after this period, the file written likely contains a checksum or data error.
To understand more

During the OBD writing process, the immobilizer system can sometimes enter a temporary lockout state as a security precaution. Giving the vehicle a full sleep cycle (10 minutes locked) allows these modules to synchronize correctly. If failure persists, it indicates that the ECU software does not recognize the new data as valid.

This software version is unknown by the server

Method: OBD

Issue: The bFlash interface indicates that the current ECU software ID is not found in the cloud database.

Solution
  • If you have access to a matching original file for this software version, please provide it to our team.
  • Send the file via email to Support@bFlash.com to have it indexed on the server.
  • Contact our technical support for further guidance on file submission.
To understand more

bFlash uses a cloud-based server to provide Virtual Reads and automated patching. When a new manufacturer update is released, it may not be on the server yet; manual submission allows us to update the database for you and all other users.

Dynomode activation error

Method: Dyno Mode diagnostic

Issue: The diagnostic protocol fails to trigger the Dynamometer mode required for power testing.

Solution
  • Verify that the vehicle hood (bonnet) is open; many VAG models require this for diagnostic changes.
  • Ensure the Secure Gateway (SGW) is unlocked if the car is a newer model equipped with this protection.
  • If the error persists after checking these physical and digital locks, Contact our technical support.
To understand more

Dynomode disables traction control and stability systems for accurate dyno readings. Manufacturers implement safety interlocks, such as requiring an open hood, to prevent accidental activation during normal road use.

7F-10-22

Method: OBD

Issue: The ECU returns a 7F error code, specifically rejecting the request to enter programming mode.

Solution
  • Open the HELP section of the specific protocol in your bFlash software.
  • Verify all external conditions (e.g., Battery Voltage > 13V, Engine Temp < 50°C, Parking Brake engaged).
  • Ensure all mandatory conditions listed in the documentation are strictly met before retrying.
To understand more

The code 7F-10-22 is a standard UDS response indicating "Conditions Not Correct." The ECU monitors parameters like battery stability and coolant temperature to ensure the flash process won't be interrupted or damage the hardware.