Trouble Code Erasure

A Diagnostic trouble code will be cleared from TCM memory if 40 Warm-Up Cycles have occurred. A warm-up cycle is defined by CARB as "sufficient vehicle operation such that the coolant temperature has risen by at least 40'F from engine starting and reaches a minimum temperature of 160'F".
The Malfunction Indicator Lamp (MIL) will turn off after 3 good trips. The MIL will also turn off if the DTC's are cleared from the TCM with the diagnostic scan tool or if the problem corrects itself.