EFI-666

Diagnostic trouble code (DTC) information EFI-666

EFI-666 Diagnostic trouble code (DTC) in automatic transmission control module (TCM)

Condition
This diagnostic trouble code (DTC) indicates whether there are one or more emission related diagnostic trouble codes (DTCs) stored in the automatic transmission control module (TCM). Diagnostic trouble code (DTC) EFI-666 is stored 2 seconds after the automatic transmission control module (TCM) requests malfunction indicator lamp (MIL) lighting from the Motronic 4.4 engine control module (ECM).

Substitute value
- none.

Possible source
- one or more diagnostic trouble codes (DTCs) stored in automatic transmission control module (TCM).

Fault symptom[s]
- varies depending on the diagnostic trouble code (DTC) stored in the automatic transmission control module (TCM).

Condition
- Read off diagnostic trouble codes (DTCs) from automatic transmission and fault-trace.