2023 Toyota Highlander Engine Problems

Your car's engine surges and hesitates unpredictably when you press the gas pedal — sometimes nothing happens and the car feels slow to move, other times it suddenly lurches forward with excessive power. This inconsistent acceleration has made the car difficult to control, especially on mountain roads, and causes continuous sputtering and hesitation throughout your drive. You're concerned about safety and reluctant to let others drive the vehicle. The dealer should diagnose the engine control system, fuel delivery, and transmission programming to identify what's causing these erratic acceleration patterns.

Your engine sometimes loses power when accelerating from a stop, causing dangerous delays when merging into traffic—the car won't respond until you floor the pedal and wait 3-5 seconds. You also experience hesitation and bucking while shifting gears, which has created near-miss situations. Additionally, your power steering intermittently jerks the wheel without warning; this caused you to lose control on a wet highway at 65 mph when the steering yanked right while you were turning left, resulting in a skid. Toyota has returned the vehicle multiple times saying nothing is wrong. Diagnosis will likely involve a fuel system scan, engine computer analysis, and steering system inspection to identify the cause of the power loss and steering issues.

When you press the gas pedal, your car has a significant delay before accelerating, which caused a near-miss accident. The engine isn't responding quickly to your input, which creates a dangerous situation. This issue likely involves the fuel delivery system or engine control module and should be inspected immediately.

Your car is having trouble accelerating smoothly—it's bucking and hesitating when you try to speed up. This could make the vehicle feel jerky or unresponsive when you need it to accelerate normally. A mechanic will likely need to diagnose the fuel system, ignition system, or engine sensors to find the root cause.

Your 2023 Highlander is experiencing a noticeable bucking and hesitation during acceleration that has gotten worse over 3,500 miles. You may notice a 1-2 second delay when accelerating from a stop, and as the engine revs up, it feels like it's struggling or misfiring. The dealer confirmed the problem but indicated it's a software issue rather than a mechanical one, and they say they can't fix it.

Your car hesitates and stutters when you accelerate, whether from a stop or while driving in traffic. The dealer reproduced the problem and replaced variable valve timing parts on the exhaust camshaft, but the issue persisted. Switching to 91 octane fuel temporarily eliminated the symptoms, even though your engine is designed for 87 octane. The fix may involve fuel system inspection, spark plugs, ignition coils, or further engine diagnostics to identify why the engine isn't responding properly to your accelerator input.

Your engine hesitates and stutters when you accelerate, especially when starting from a stop or trying to pass another vehicle. The hesitation is noticeable enough to affect normal driving. The issue may be related to fuel delivery, ignition timing, or engine sensors and could require diagnostic testing to pinpoint the exact cause.

Your engine coolant temperature warning light suddenly comes on, and the temperature gauge needle jumps erratically from normal to maximum instead of staying steady. This has happened multiple times when outside temperatures were in the 90s, and sometimes the needle stays stuck at the high end. Even though a Toyota dealer couldn't find anything wrong during a previous inspection, the problem keeps recurring. The issue may involve the thermostat, coolant sensor, or cooling system circulation.

When you accelerate from a stop or pull into traffic, your Highlander hesitates and then surges forward unexpectedly, especially between 0-35 mph. This inconsistent acceleration happened repeatedly and nearly caused a collision with oncoming traffic. The engine control system or fuel delivery may need diagnosis and adjustment to smooth out the acceleration.

The "turbo lag" as the dealership calls it is horrendous. Vehicle has extremely poor acceleration from a stop. It is very dangerous when pulling out into traffic as acceleration falls flat for a second or two until it eventually responds and accelerates.