Diagnostic Trouble Codes (DTCS)

A diagnostic trouble code (DTC) is stored if the control module detects a fault.

Diagnostic trouble codes (DTCs) for different types of short circuits are only stored when no trailer connector is connected to the output. This is so that Diagnostic trouble codes (DTCs) are not stored when there are faults in the trailer's cable harness or connectors.

Should a fault disappear for any reason after being stored in the control module as a diagnostic trouble code (DTC), the information remains stored in the control module. If a fault is no longer permanent, the diagnostic trouble codes (DTCs) remain as intermittent.