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2018 TLX V6 - Rough Shifts After 60k Miles, Time for Transmission Fluid?

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Emily N. · rep 0 · May 22, 5:00 AM · 1 replies · solved · Question

Hey everyone, I've got a 2018 Acura TLX V6 with about 62,000 miles on it. Lately, I've noticed the shifts feeling a bit rougher, especially from 2nd to 3rd gear. It's not terrible, but definitely not as smooth as it used to be.

I checked my service records and I don't think the transmission fluid has ever been changed. Is 60k miles the typical interval for these cars? I'm wondering if a fluid drain and fill would help, or if there's something else I should be looking at. Any DIY tips or things to watch out for if I attempt this myself?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:00 AM

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ClearTheCode guidance (Acura · Maintenance & DIY)

Summary: For 2018 TLX V6 - Rough Shifts After 60k Miles, Time for Transmission Fluid?, work through these steps on your 2016+ vehicle:

  1. Confirm the symptom — note when it happens (cold start, highway, after fuel fill, etc.).
  2. Scan codes — save all pending/stored DTCs; don't clear until you've recorded them.
  3. Check TSBs & recalls — look up your VIN for open campaigns and known fixes.
  4. Inspect the obvious — related fuses, connectors, fluid level, and recent repairs.
  5. Test the common fix — follow model-specific service procedures; one change at a time.
  6. Escalate if needed — burning smell, no brakes, overheating, or stalling in traffic → shop visit.

Owner reported: Hey everyone, I've got a 2018 Acura TLX V6 with about 62,000 miles on it. Lately, I've noticed the shifts feeling a bit rougher, especially from 2nd to 3rd gear. It's not terrible, but definitely not as smooth as it used to be.

I checked my service records and I don't think the transmission fluid has ever been changed. Is 60k miles the typical interval for these cars? I'm wondering if a fluid dra…

This is educational guidance, not a substitute for hands-on diagnosis.

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