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Siemens MSD81 - TC1796

Siemens MSD81 - TC1796 FAQ

Siemens MSD81 - TC1796

Errors

7F-31-73

This error signals that the ECU password has been modified, preventing any further programming operations.

View Solution →

Concerns vehicles from

Alpina BMW

7F-31-73

Method: BENCH

Issue: You are unable to perform programming tasks because the ECU password has been changed from its factory state.

Solution
  • Locate your original backup file for this specific ECU.
  • Prepare a detailed description of the situation and the steps already taken.
  • Contact our technical support and provide the backup file for manual password extraction.
To understand more

When the Siemens MSD81 detects a password mismatch, it immediately halts communication to protect the integrity of the TC1796 processor's data. Manual extraction from a backup is the only reliable way to recover access when the standard BENCH security protocols are bypassed by a custom password.