2020 Toyota Highlander: Whining noise
Common wear/failure (not a recall)
Symptoms
Owners of the 2020 Highlander report: whining noise. CarComplaints.com lists 4 owner complaints, average mileage 76,250 miles.
NHTSA has 126 owner complaints for the 2020 Highlander in this area. Examples:
- NHTSA complaint ODI #11768515 (filed 10/02/2026): “• what component or system failed or malfunctioned, and is it available for inspection upon request? the ua80 8-speed automatic transmission assembly (specifically internal mechanical wear resulting from front carrier assembly bearing degradation/torque conver…”
- NHTSA complaint ODI #11765030 (filed 09/17/2026): “My highlander started making a whining noise while accelerating. took it to my local dealership and was told i need a new transmission. i have 87,000 miles on it! total cost = $8,000.…”
Likely causes
Sources do not establish a single root cause; diagnosis is needed. Owner-reported fixes are listed below.
Fix, in plain English
Most common owner-reported solutions on CarComplaints.com: per totoyta : fix is a whole new transmission (2 reports) replace transmission (1 reports). Check for open recalls and extended warranty coverage with a dealer before paying out of pocket.
DIY difficulty: Pro
Diagnosis needs a scan tool; repair or replacement needs a lift, transmission jack and the manufacturer's fluid fill/relearn procedure. (Our assessment.)
Cost
No sourced cost range: get a written quote after diagnosis.
Typical parts (search links, no affiliate codes)
AutoZone · O'Reilly · Advance · RockAuto
Sources
Page last updated .