Diagnostic Trouble Codes (DTCs)
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Volvo S80, 2005 Volvo S80, 2004 Volvo S80, 2003 Volvo S80, and 2002 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.
If the control module detects a fault a diagnostic trouble code (DTC) list is sent from the additional heater module to the central electronic module. The heater can identify up to 25 faults.
The diagnostic trouble codes (DTC) are stored in the central electronic module. If for some reason a fault disappears after the diagnostic trouble code (DTC) has been permanently stored, information about the fault is stored in the central electronic module.