2023 Toyota Highlander: Engine complaints
Owner-reported issue (NHTSA complaints, not a recall)
Symptoms
NHTSA has 28 owner complaints for the 2023 Toyota Highlander that list the engine component. Complaints are individual owner reports, not verified defects.
Examples:
- NHTSA complaint ODI #11763643 (filed 09/11/2026): “Ongoing severe engine surge after coasting while braking lightly during moderate downhill drives on pavement. it happens consistently with different drivers at speeds between 25 to 45 mph. the surge can cause the vehicle to lurch forward enough to move the vehicle forward suddenly, and rapidly to ot…”
- NHTSA complaint ODI #11736031 (filed 05/06/2026): “The contact owns a 2023 toyota highlander. the contact stated that while driving at lower speeds, pulling into an uphill driveway, the vehicle had independently accelerated while the accelerator pedal was depressed. in addition, the contact stated that she was not able to depressed in time and had c…”
- NHTSA complaint ODI #11669632 (filed 06/27/2025): “Weather conditions were severe due to a snowstorm, causing ice buildup on the road, low visibility, and slippery pavement. despite driving cautiously, i lost control of the vehicle, which resulted in going off the road, down an embankment, and crashing into a tree. immediately after the impact, i c…”
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
Internal engine work (lifters, oil consumption, fuel dilution diagnosis) requires engine teardown or dealer software/tests. (Our assessment.)
Cost
No sourced cost range for this issue. Get a written quote after diagnosis.
Typical parts (search links, no affiliate codes)
AutoZone · O'Reilly · Advance · RockAuto
Sources
Page last updated .