P1630critical severityPowertrain
Drive Authorization EEPROM Fault
on 2002 Mercedes-Benz SL 3.0L I6 · RWD
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
- Attempt to read DAS EEPROM data with Star Diagnosis
- Check ECU for recent programming history
- Test ECU power and ground stability
- Attempt DAS data re-write
- 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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