If the MIL light is ON, there will be a DTC and associated freeze frame data stored in the PCM's memory.

Question

Quizplus · Accepted Answer

When the Malfunction Indicator Lamp (MIL) light is on, it indicates that the Powertrain Control Module (PCM) has detected a fault in the engine or emission control system. This triggers the PCM to store a Diagnostic Trouble Code (DTC) and capture freeze frame data, which is a snapshot of the vehicle's operating conditions at the time of the fault.

If the MIL Light Is ON, There Will Be a DTC