Diagnostic Trouble Codes (DTCS)

If the control module detects a fault then it stores a diagnostic trouble code. If a fault disappears for any reason after a diagnostic trouble code has been permanently stored in the control module then the information on the fault remains in the control module.

In some instances, the incorrect signal is replaced with a substitute value or restricts certain functions. Any DTCs are stored in the memory on the control module and the information can be read out using VIDA.