DTC EFI-666

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

Substitute value(s)
- none.

Possible source(s)
- One or more diagnostic trouble codes stored in automatic transmission control module.

Fault symptom(s)
- Varies depending on the diagnostic trouble code stored in the automatic transmission control module.