GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1998 🢒 Catera 🢒 DTC 🢒 DTC 55 Theft Deterrent Module Malfunction

Circuit Description

Internal defects in the Theft Deterrent Module sets DTC 55.

Conditions for Setting the DTC

Theft Deterrent Module hardware failure (EEPROM, RAM, ROM defective).

Action Taken When the DTC Sets

The engine will not start.

Conditions for Clearing the DTC

Replacing the Theft Deterrent Module.

Diagnostic Aids
    • Check for proper power and ground to the theft deterrent module.
    • Replace the theft deterrent module if power and ground are OK. Refer to Steering Wheel and Column On Vehicle Service.