Vehicle is sluggish and will not accelerate from a dead stop for several seconds. The gas pedal often has to be pushed much farther down than usual so then when the vehicle actually starts moving it lurches. It often seem like it can't find the proper gear so it will buck and stutter while driving. The shifting is not smooth at all and you never know how the vehicle will respond making for a very unpredictable driving experience. This all started shortly after reaching the 2000 mile mark. The cruise control has issues reaching and maintaining the speed that is set. I found the Toyota service bulletin, T-SB-0087-23 and have made an appointment with my local dealer to hopefully fix the issue.

- Paducah, KY, USA

The vehicle has erratic acceleration. It will either be extremely slow and jerky or it will jump forward with great speed and force. This is dangerous and may cause an accident. You have no control when it comes to acceleration whether you are leaving a stop light or trying to avoid an accident.

- Wilton, CA, USA

From a stop or slow roll (0-10 mph), significant hesitation is experienced after pushing the gas. The engine will not respond for a few moments and then all of a sudden it will take off in a jerking manner. Note that this is experienced when the engine auto start/stop is deactivated, so it is not from the delay of the engine starting when activated. This hesitation causes a near miss safety situation in many normal driving activities, but the highest risk is when turning left in front of oncoming traffic. I brought the vehicle to a Toyota dealership for the condition, noting Toyota's Service Bulletin T-SB-0087-23 for this exact issue, but after 3 days and 40 miles of the dealership driving it, they stated that they cannot reproduce the issue. There are no warning signs or lamps, and this issue has been occurring since the vehicle had about 1,000 miles, and the vehicle now has 20,000 miles on it.

- Grove City, OH, USA

When 87 fuel is put into the vehicle, the 2023 highlander is jerky/has hesitation, RPMs jump around. Trying to slow down to a yield then go again it jerks and almost feels like engine is cutting out. Seems worse when car is being driven on warm day with a/c on or under a -??load-??. Very dangerous in intersections. Current fix is to put 93 octane in the vehicle to remedy the issue. Putting 93 octane fuel in the vehicle does help. 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 when they test drive and no codes are showing even explaining a TSB was issued they refuse to fix. Started at 500 miles on odometer, still happening at over 13,000 miles.

- Peculiar, MO, USA

Hesitation/Non-linear Acceleration From a Stop. Reprogramming the ECM completely resolved the issue. This needs to be sent out to affected vehicles but I had to investigate and pretty much demand a resolution. I fear what this could later do to our engines, etc.

- Great Lakes, IL, USA