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Discussion Starter · #1 · (Edited)
When the powertrain control module (PCM) detects a fault during the 1st trip, the DTC and corresponding freeze frame data are stored in the PCM’s memory. The malfunction indicator lamp (MIL) will not be illuminated until the fault is detected again during the 2nd trip. Certain DTCs are capable of turning the MIL light on or blinking it during the first trip.​
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