When 87 octane fuel is put into the vehicle, the 2023 highlander is sluggish to start and make jump at times as well. After reading other complaints online, the current fix was putting 93 octane in the vehicle to remedy the issue. Putting 93 octane fuel in the vehicle does help although the vehicle jumps around RPM's when going from ECO mode to normal. All of these issues pose a risk to the car jumping from a start to cause a rear-end accident. I've complained to the dealer and they've stated everything is normal. Folks online stated their dealerships said Toyota was working on a fix.

- Tega Cay, SC, USA

Engine intermittently has no power on take off and causes an unsafe condition to turning into traffic where car will just not go until after flooring it and a 3-5 second delay!! Engine also looses power and bucks or misses while accelerating through gears. This has caused multiple near miss incidents when turning into or across traffic. Also have issues with the steering assist that it yanks the wheel intermittantly. This cause me to loose control on the wet interstate in a turn when it yanked the wheel to the right while banking left at 65mph. I panicked and pulled the wheel back which cause a skid. The system has been turned off since. Toyota is not doing anything to repair anything and keep giving me the car back saying its fine.

- Wood River, IL, USA

I've had the car for 6 months. After a few months we noticed a "bucking" during acceleration and a "hesitation" when pressing the accelerator. Under medium to hard acceleration the car will exhibit these traits almost consistantly and now after 3500 miles it has become so noticeable that it is dangerous! The hesitation is "off the line" from a dead stop. There is at least a couple second delay sometimes when leaving a stop. And then as the car climbs in RPM's you can feel the engine struggling almost like a car with bad spark plug wires. It tends to "spit and buck" as it is accelerating. We have tried different fuels, fuel cleaners, different octanes, and nothing seems to curb the problem. We took the car to our local dealer and they confirm the problem but have stated that there is nothing they can do as it appears to be a software issue with the car. I have requested from Toyota using their "Brand engagement center" to provide an engineer to evaluate the car and so far have not heard back from them in almost a week.

- Gilbert, AZ, USA

Upon acceleration, car hesitates then surges. Started after approximately 2000 miles. Occurs most frequently from a dead start. However, continues upon acceleration up to 50 mph. Took to Toyota Dealer, but they were unable to diagnose. Others report similar problems on Toyota Nation Form. Concerned about pulling out into traffic safely

- New London, NC, USA

There is a significant hesitation / stuttering when the gas pedal is pressed (i.e. the vehicle doesn't move properly when the gas pedal is pressed). This is especially dangerous when pulling out into traffic, making turns, etc. This appears to be a known problem with this model and Toyota is working on a TSB (supposedly). Doing a Google search for this problem shows that a number of consumers are having a similar issue. A few people have documented the issue here: https://www.toyotanation.com/threads/2023-highlander-2-4-turbo-surging-and-bucking-under-acceleration.1751952/ This is an ongoing problem. It hasn't resulted in an accident yet, but the lag / stutter in accelerating is putting consumers at risk. I just picked one random date below, but it has been ongoing since the vehicle was purchased new and appears to be happening to numerous other people as well as is evidenced by an internet search.

- West Linn, OR, USA

2023 Toyota Highlander XLE with 2.4 Turbo hesitates for an unacceptable period of time when accelerating from a stop. This could pose a huge safety risk when merging into traffic from a stop sign. The lag / hesitation is present on all eco / normal / sport drive modes. The issue has been occurring since the vehicle was purchased at 70 miles and currently has about 5200 miles. Toyota needs to look into this issue and address it as soon as possible.

- Victoria, TX, USA

Vehicle unpredictably hesitates during light to moderate acceleration in all driving modes (Sport, Normal, and Eco). This is especially dangerous when crossing in front of oncoming traffic from a stop or slow speed. Had a certified mechanic drive the car and verify the problem, but the car's systems don't report that there is a problem, so he had no answers.

- Florence, AZ, USA