Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information

IMM-121 PIN code

Condition




The immobilizer control module checks the memory circuit, EEPROM, when a new PIN is written into the memory (during initiation). Diagnostic trouble code (DTC) IMM-121 is stored if there is a fault. Faults causing diagnostic trouble code (DTC) IMM-121 to be stored also cause IMM-112 to be stored.
The diagnostic trouble code (DTC) is erased when the counter value reaches 254.

Possible source
- Fault in control module memory circuit, EEPROM.
- Faulty procedures when programming.
- The immobilizer control module is not initiated.
- The immobilizer control module does not accept or cannot read the PIN code while initiating.

Fault symptom[s]
- The control module cannot be initiated.
- Engine starts but stops immediately.