2021 Toyota Highlander Problems

2021 Toyota Highlander problems owners report most

2021 Toyota Highlander problems are documented in public: owners have filed 550 complaints with NHTSA, the earliest in 2020 and the most recent in 2026. Sorting those by the component the filer named puts the powertrain clearly first, at 229 of the 550 complaints, two of every five filed.

A complaint is not a repair bill and not a defect finding. It is one owner telling the regulator something went wrong. What makes the count useful is the concentration: when one component takes 42 per cent of everything filed on a car, the pattern is doing more than chance.

Against the 2020 car, this model year has drawn 66 per cent more complaints (550 against 331). Both years are led by the powertrain, so this is a fault that carried over rather than one introduced with the 2021 car. A rise is worth more attention than a fall here, because a newer car has had fewer years on the road to accumulate reports.

Of those complaints, 17 describe a crash and 4 describe a fire. Filers reported 19 injuries.

Recalls on the 2021 Toyota Highlander

A recall means the manufacturer or the regulator found a safety defect, and the repair is free at a franchised dealer however old the car is. There are 5 recalls on this model year. Your own car may be covered by some, all or none of them, so check the VIN rather than the model.

In owners own words

These are complaints filed about the powertrain, quoted as written. They are one persons account rather than a diagnosis, and they are here because a symptom described by a driver is easier to recognise than a component name.

Transaxle Repair/Replacement: recommend transmission replacement due to whining noise coming from transmission due to internal failure. The transaxle is the transmission for front wheel drive vehicles. The transaxle transfers power from the engine to the wheels. Unsafe driving conditions issue is stemming from faulty transmission, not only on this particular vehicle but many 2021 Toyota Highlander vehicles for the same transaxle repair/replacement issue. I have gone to Toyota multiple times before and even with a Technical Service Bulletin in place for this transmission issue, they did not cor

I am writing about my 2021 Toyota Highlander XLE AWD VIN # [XXX] . I purchased this vehicle brand new on 3/29/2021 at ‘Koons Easton Toyota’ in Easton, MD. In October 2025 I started hearing whining noise from the engine compartment. It was audible only when accelerating the vehicle and would go away if I took my foot off the accelerator. On 10/22/2025, I took the vehicle for inspection to ‘Ourisman Toyota 40’ dealership in Edgewood, MD. The technician told me that this is a known issue in this model/year and recommended to replace transmission as there was no other fix. He gave me a $9,995 est

transmission has failed. Toyota states: Toyota Technical Service Bulletin T-SB-0008-21 addresses a whining or grinding noise in select 2021 Toyota vehicles equipped with UA80E orUA80F automatic transmissions caused by a defect in the front carrier assembly pinion shafts. Yes it can be available for inspection. This can be repaired with a $12,000 new transmission. * Sudden loss of acceleration: You may press the gas and the vehicle doesn’t accelerate normally. This is particularly dangerous when merging onto a highway, crossing an intersection, or passing. How this toyota highlander is puttin

This vehicle was purchased new in 2021 with 4 original miles. Today it has 58,000 miles and has been maintained, per manufacturer recommendations, a certified Toyota dealership. At around 56,000 miles we noticed a slight whine in first gear. This was attributed to normal noise that we simply had not noticed. by 58,000 miles the while had extended to all gears and become more prominent. Research online shows that this is a known issue with the UH80 transmissions and has been since at least 2017. Toyota has a TSB for it (TSB-0008-21). This was not mentioned at the time of purchase or any of the

Every component, by complaint count

The full breakdown of what owners named when they filed. Components below the top ten are grouped out of this table.

How other model years compare

The same nameplate across the years we hold. Complaint counts fall naturally for newer cars because fewer of them have been on the road for long, so read the column as a rough signal rather than a ranking. In this set the 2021 Toyota Highlander has drawn the most complaints and the 2016 Toyota Highlander the fewest.

What to check on the transmission and driveline

Powertrain reports usually describe a shift that arrives late, lands hard, or hunts between gears, often worse when the car is cold or towing. Some describe a shudder at a steady cruise rather than a bang between gears.

Buying a used 2021 Highlander

Drive it from cold. A transmission fault that hides once warm is the most common thing a short test drive misses. Take it to highway speed, let it settle into top gear, then slow and accelerate again to make it downshift under load.

If you already own one

Get the fluid condition checked before anything else, and ask for the transmission control software level at the same time. Several of these complaints were answered by the manufacturer with a reflash rather than a rebuild, which costs a fraction as much.

• Test drive from cold, not after the seller has warmed it up.
• Ask whether a transmission software update exists for the VIN.
• Check the fluid condition and when it was last changed.
• Get any rebuild quote itemised into parts, fluid and labour.