The electric trunk latch solenoid can get stuck in the open position making it so the trunk will not latch closed. The diagnosing technician should verify correct electrical connection at the solenoid and check for correct cable routing. The trunk latch most commonly will need to be replaced.
Trunk Will Not Latch Closed on Mercury Milan
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Trunk latch isn't working. I open the trunk with my remote and it pops open and makes a funny vibrating noise. I try to close the trunk and it doesn't latch.
trunk wont latch and interior lights wont turn off
Mine has same problem!