The automatic gearbox fitted behind the V6 TL and several other mid-2000s Acuras — the clearest exception to this era's generally excellent reliability reputation.
This is the exception that proves the rule on an otherwise strong era of Acura engineering. Internal clutch pack wear, worsened by factory fluid change intervals that proved too long in practice, caused a meaningful number of failures — enough that it's now one of the most discussed issues across these forums. The good news: it's well documented, easy to screen for, and far less of a lottery than it was when these cars were newer.
Not a guarantee, but a pattern seen consistently across owner forums and independent-garage reporting.
First reports of harsh or delayed shifts on transmissions that have never had a fluid service.
The window where documented failures become most common on unserviced examples.
Surviving examples at this stage have usually either been rebuilt or proactively serviced.
Ask directly about transmission fluid history — this matters more on these cars than almost anything else you'll check.
During the test drive, pay close attention to shift quality under both light and firmer acceleration, watching for hesitation, flare, or harsh engagement.
If history is unknown, budget for an immediate fluid service as inexpensive insurance, and get a specialist opinion before relying on the car for long trips.