2019 Ram 2500 — fuel trims are positive at idle and improve with RPM

I wouldn't throw parts yet. Move a coil or plug on the 2019 Ram 2500 if it's cylinder-specific and see whether the code follows. That's the branch I'd chase this week. Do that first. I'll poke at it this weekend.

I'd want a measurement, not a hunch. Two 2019 Ram 2500s can feel identical and have different causes, so measure before you copy someone else's repair. Don't erase codes until someone who can help has seen them. When does it actually happen? I'd rather be boring and correct. Trying not to diagnose from the couch.

This is usually cheaper to test than to guess. A pressure test beats staring at a dry driveway if the 2019 Ram 2500 is losing coolant with no puddle. If the cheap test changes it, stop and reassess. This is from a 2019 Ram 2500 in Las Vegas with 61,000 miles. When does it actually happen? That's my plan before I call anyone.

Log the conditions before you spend. If a shop can't duplicate it on the 2019 Ram 2500, bring a video plus freeze-frame data, not just a story. Save the big job until that test fails. On “fuel trims are positive at idle and,” that was the fork that mattered for me. This is from a 2019 Ram 2500 in Las Vegas with 61,000 miles. When does it actually happen? Only after sitting overnight so far.