A two-trip DTC will be stored in the PCM memory when a fault is detected during the first trip.

Question

Quizplus · Accepted Answer

A two-trip DTC is designed to only set a fault code in the PCM memory if the fault is detected during two consecutive trips or driving cycles. During the first trip, the PCM will usually store a pending code that will not activate the Check Engine Light until the fault is detected again in the next trip. However, if the fault is severe or critical, the PCM may trigger a DTC and activate the Check Engine Light immediately during the first trip. In either case, the PCM will store the DTC in its memory and may also record freeze frame data or other relevant information to help diagnose the problem.

A Two-Trip DTC Will Be Stored in the PCM Memory