What to watch out for: '12 Crew Cab Cummins

mopardug said

On the test drive, when we stopped and put it in 4 high with the round thingy, a light flashed twice, and stayed on. We were on the road, but nothing made noise. When it was turned back to 2WD, it flashed twice, then went out.

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That's to tell you it was in 4wd, should have said so and when disengaged the light should go out. There are no good Mopar automatics, but as long as it doesn't slip or chatter there are no issues, most last around 250K miles before something starts to fail. If it did not tow much and you don't plan on doing it either it should last longer. Find out if trans service was ever done and ask if it ever had fuel injector replacement or cleaning. The trans and injectors are the only thing I ever had issues with...