Eight-speed automatic: the whine, the jerk, and out-of-warranty failure
$3,000–$9,000This is the defining question on the 2018. Two different things get lumped together. The one that's normal: erratic, jerky low-speed shifting — first gear's very high ratio makes the car lurch as it pulls away, then smooth out. Mechanics are explicit that this is how the transmission behaves, not a fault. The one that matters: a faint whining noise that rises with the accelerator and fades when you lift off; left alone it grows into a grinding noise and can end in failure, and owners report it starting around 60,000 miles — right after warranty. Toyota has issued no warranty extension, and there's an active class-action allegation that these transmissions burn fluid prematurely and fail early. Mechanics add nuance: the four-cylinder's UB80 fails far less often than the V6's UA80; the acceleration whine was concentrated in these early 2018 builds and Toyota later revised the transmission; and 60,000-mile fluid changes help, though some owners serviced early and still failed. What makes the failure sting is the repair price — a used unit alone runs ~$2,700 and full replacements are quoted at $3,000 up to $7,000–$9,000, absurd for the class. Warm the car fully, accelerate, and listen for the whine; treat it on a high-mileage car as a walk-away.
Sources: NHTSA complaint and recall databases, 2018 Camry and Camry Hybrid · Independent mechanic channel transcripts (8th-gen Camry 8-speed, incl. shop teardown)