2020 Toyota Highlander: Power Train complaints
Owner-reported issue (NHTSA complaints, not a recall)
Symptoms
NHTSA has 126 owner complaints for the 2020 Toyota Highlander that list the power train component. Complaints are individual owner reports, not verified defects.
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 converter heat buildup). no, the component and…”
- 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.…”
- NHTSA complaint ODI #11762589 (filed 09/07/2026): “At 51,000 mile the transmission started making a whining noise. took it to the dealer and they stated the transmission needs replacement.…”
Likely causes
These complaints do not establish a single root cause; read the examples above and get a diagnosis.
Fix, in plain English
No single fix is established by these reports. Check your VIN for open recalls at nhtsa.gov/recalls, ask a dealer about technical service bulletins (TSBs) or extended warranty coverage, then have the system diagnosed.
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 for this issue. Get a written quote after diagnosis.
Typical parts (search links, no affiliate codes)
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Sources
Page last updated .