Fault Code Diagnostics

Fault Code Tests
Fault codes are two-digit numbers that identify a circuit that is malfunctioning. There are two different kinds of fault codes.

Current Fault Codes:

1. Current Fault Codes - Current means the fault is present right now. There are two types of current faults: input faults, and system faults.

Historical Fault Codes:

2. Historical Fault Codes - Historical or stored means that the fault occurred previously, but is not present right now. A majority of historical fault codes are caused by intermittent wire harness or wire harness connector problems.

NOTE: A battery disconnect will erase all faults stored in Read Available Memory (RAM) of the ATC control module. It is recommended that all faults be recorded before they are erased.