Diagnostic Trouble Codes (DTCS)

Diagnostic Trouble Codes (DTCs)

Diagnostic trouble codes (DTCs) are stored in the control module if the climate control module detects a fault. Every diagnostic trouble code (DTC) has a counter which records the number of cycles which have been fault-free since the diagnostic trouble code (DTC) was stored (intermittent fault). A fault which is detected in each operating cycle is defined as permanent. A fault which is detected in one or more (but not all) operating cycles is defined as intermittent.

An operating cycle is the period from when the ignition was switched on, remained on for at least 10 seconds and was finally switched off for at least 10 seconds.