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2012 MERCEDES-BENZ ML
3.5L V6•AWD•AUTOMATIC•gas•M272
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Repairs0Labor492Torque2165Fluid8DTC1852Battery2Maintenance0Recalls0
P1630critical severityPowertrain

Drive Authorization EEPROM Fault

on 2012 Mercedes-Benz ML 3.5L V6 · AWD

What this code means

The ECU detected a fault in the EEPROM (Electrically Erasable Programmable Read-Only Memory) where the Drive Authorization System data is stored. The immobilizer key data or authorization codes are corrupted or unreadable.

Symptoms

  • Engine will not start
  • Immobilizer warning active
  • Key not recognized
  • Cannot program new keys

Common causes

  • ECU EEPROM data corruption
  • ECU exposed to electrical surge
  • Failed ECU programming attempt
  • ECU internal memory degradation
  • Battery disconnect during write operation

Diagnostic steps

  1. Attempt to read DAS EEPROM data with Star Diagnosis
  2. Check ECU for recent programming history
  3. Test ECU power and ground stability
  4. Attempt DAS data re-write
  5. Check if virgin ECU is needed

Repair notes

Reprogram the DAS EEPROM data using Mercedes Star Diagnosis; ECU replacement may be necessary if memory has failed.

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