VinCanary

Known problem · Toyota Highlander · UA80 eight-speed automatic · 2017–2022

A Toyota transmission with a defect window — and a whine that tells you which side of it you're on.

The UA80 eight-speed launched rough in 2017, was fixed in production by mid-2018, and then aged into a second act: high-mileage whine failures now surfacing on 2019 and 2021 cars. Toyota's extended coverage makes replacement free where it applies — outside it, owners quote $6,000–$11,000.

6 model years · full failure sequence · from NHTSA data + mechanic transcripts

Is yours doing this?

  • Whine under acceleration, rising with revsThe failure tell mechanics point to. Coverage status decides what it costs you.
  • Harsh or erratic shifting on a 2017–early-2018The original defect window. Check the build date on the door jamb.
  • RPM flare on the 1–2 upshift (early-2020 builds)Software, not hardware — a dealer calibration update fixes it free.
  • Busy, downshift-happy behaviorNormal for this unit. Character, not damage — don't pay for a repair you don't need.

The whine is the symptom that costs money. Hear it, and the next stop is a dealer coverage check, not a test of patience.

The failure, explained

The UA80 was the trial-year transmission of the fourth-generation Highlander. Its story runs in two acts — a launch-defect window, then high-mileage wear:

  1. 1 · Defect window

    2017 through early-2018 builds carry the launch unit: whine, harsh shifting, failures. Per the mechanic source, resolved completely by mid-2018.

  2. 2 · The whine

    On aging units the whine appears under acceleration and rises with revs — the audible start of the failure.

  3. 3 · Out of warranty

    Failures cluster at higher mileage, often past the factory warranty — which is why coverage status is the whole question.

  4. 4 · Replacement

    Free under warranty or Toyota's extended coverage where it applies; owners' dealer quotes run $6,000–$11,000 outside it.

Repair/replacement under warranty or extensionWhere Toyota's coverage applies — verify by VIN

$0

Out-of-warranty UA80 replacementOwners' dealer quotes, 2017–2019 cars

$6,000–$11,000

Out-of-warranty replacement, 2021 carsOwners' dealer quotes on the newer file

$6,000–$8,000

Which years, which flavor

The affected years run 2017–2022. Every one of them has a chapter — but not the same one.

20166-speed era2017trial year2018build date2019high-mileage failures2020software flare2021whine returns2022mature
2017

The trial-year transmission: whine, harsh shifting, failures. Replacement quotes reach $11,000 out of warranty.

Full report →
2018

Fixed in production by mid-2018. A late build carries the revised unit; an early build can still sit in the defect window — the door-jamb build date settles it.

Full report →
2019

The revised unit, but high-mileage whine failures now land out of warranty. Extended coverage is the difference between $0 and five figures.

Full report →
2020

Very-early-2020 builds can flare RPMs on the 1–2 upshift — software, fixed free with a dealer update. The eight-speed itself is the sorted unit here.

Full report →
2021

The whine thread returns on higher-mileage 2021s, quoted at $6,000–$8,000 out of warranty — the loudest line in that year's file.

Full report →
2022

Mature, but drive it: the complaint thread rates minor, and the test drive is still the cheapest diagnostic there is.

Full report →

What’s covered — and what never was

Run the VIN at nhtsa.gov/recalls before anything else. Then know where the line is.

✓ Free under recall

  • Toyota's extended transmission coverage replacement is $0 where it applies. Ask the dealer for the exact VIN's coverage status before the test drive, not after — it's the difference between a free fix and $6,000–$11,000.
  • Early-2020 calibration update the 1–2 upshift RPM flare is software, resolved free with a dealer update; later 2020 builds and all 2021s are unaffected.

✕ On the owner, always

  • UA80 replacement outside coverage $6,000–$11,000 by owners' dealer quotes on 2017–2019 cars; $6,000–$8,000 on 2021s

What to do about it

Different move depending on which side of the sale you’re on.

Shopping for one

  1. Highway test with the radio off. Accelerate through the range and listen for a whine that rises with revs. That sound is the whole negotiation.
  2. On a 2018, read the door jamb. A mid-2018-or-later build date carries the revised transmission — effectively the 2019 unit. An early build needs its transmission history verified instead.
  3. Ask the dealer for the VIN's coverage status. Extended coverage turns the worst case from five figures to zero. Get the answer in writing before money moves.
  4. Don't pay for character. Busy downshifting is how this unit behaves. The whine is the fault; the busyness is not.

Already own one

  1. Hear a whine? Book the dealer this week. Diagnosis while any coverage window is open beats the same diagnosis after it closes by up to $11,000.
  2. Get the symptom on a dated work order. Even a "no fault found" visit creates the paper trail that matters if the failure completes later.
  3. Early-2020 flare: take the free update. It's calibration, not damage — and the update closes the question.
  4. Know your build date. Owners of early-2018 cars should treat themselves as 2017 owners for watchfulness purposes.
Resolved completely by mid-2018.
The mechanic verdict on the UA80's launch defects — which is why the build date on the door jamb matters more than the model year

Found one? Let the canary check its paperwork.

Free VIN check: open recalls, coverage windows, and this UA80 eight-speed automatic’s history on that exact vehicle.

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