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Vehicle: 2024 Toyota Grand Highlander Hybrid Max  The vehicle intermittently experiences a severe hesitation and shudder during acceleration from approximately 0-40 mph. The condition occurs only under specific circumstances:  -The vehicle has been parked long enough for the engine, transmission, and related systems to cool to ambient air temperature.  -The vehicle is started and driven shortly thereafter.  -Engine oil and transmission temperatures are below approximately 160Â°F.  -The air conditioning system is operating at maximum cooling with Eco Air Mode enabled.  -The hybrid battery indicator displays approximately three bars of charge.  When these precise conditions are present, the vehicle may hesitate, shudder, and fail to respond normally to accelerator pedal input during acceleration. Even with the accelerator pedal fully depressed, repeatedly, there is a noticeable delay in power delivery and vehicle acceleration. This creates a situation where the vehicle does not accelerate as expected when entering traffic or attempting to increase speed.  The vehicle has previously received Toyota Technical Service Bulletin T-SB-0017-24; however, the condition continues to occur intermittently. No warning lights, diagnostic messages, or system faults are displayed when the event occurs.  The condition typically occurs only once during the initial drive cycle after a cold start and has not been observed after the vehicle reaches normal operating temperature. The issue is most common in the warmer months and has never been encountered at freezing or below temperatures.

TOYOTA GRAND HIGHLANDER 2024 ENGINE

My 2024 Used Toyota Grand Highlander Hybrid Platinum Max was at a slight decline stopped at a stop sign in Echo mode.  The whole car began to violently shake and lurching forward.  No one was in front of me and my foot was on the brake or I probably would have run into a car in front of me.  The dashboard then flashed a warning about the hybrid system overheating.  The only way to stop it was to turn off the engine, then turn it back on.  The car then began driving normally.  I have also had an issue with hesitation felt while accelerating 0-40 mph with study throttle.    Upon researching both issues, they should be resolved with TSB calibrations to my car of T-SB-0028-25 and T-SB-0017-24.  This is not an error that would come up when doing a diagnostic check on my car's computer per research I have done.  I took my car to get the updates at Toyota of Redlands, CA, and they refused to do them unless they could recreate them themselves.  I called Toyota to report this, and they said that each Toyota dealership/service is privately owned at their own discretion.  I was basically told to return if I experience it again.  I do not want to experience this again and they wouldn't take my word on it anyways.  I feel like next time I could injure myself or someone else if this glitch happened again.  I therefore would like to implore to make this a mandatory preventative TSB calibration for cars that have had this reported/models/year which mine has.  This goes for any TSB calibrations should be done preventatively, but especially ones that can cause a potential accident like T-SB-0028-25 and T-SB-0017-24.   Here is information on why this would not show up on a diagnostic test:  Your Toyota didn't generate an error code because the shudder is a software calibration issue rather than a component failure. The onboard computer (ECU) only triggers a check engine light or throws a Diagnostic Trouble Code (DTC) when sensors detect a hard mechanical or electrical failure.

TOYOTA GRAND HIGHLANDER 2024 UNKNOWN OR OTHER

What component or system failed or malfunctioned, and is it available for inspection upon request?  I was driving when I heard a loud boom, it almost sounded like a gunshot. Not noticing anything I continued driving.  After a short distance I started hearing wind whistling. It was at this point I pulled over and saw my sunroof had shattered and there was a big hole.  How was your safety or the safety of others put at risk?  If I had not have the shade closed glass would have fallen into the car.   Has the problem been reproduced or confirmed by a dealer or independent service center?  Yes, I brought the car to the Toyota dealership.   Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others?  I did call my insurance company but I am not sure if they actually inspected the damage.  They have been dealing directly with the Toyota dealership service department.    Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear?  No, that's why I continued to drive until I heard the wind whistling

There is an ongoing problem with Android connectivity. I have brought this to the dealerâs attention multiple times, but they continue to claim that my phone is not compatible. However, this same phone connects flawlessly and consistently in my other vehicles, so compatibility does not appear to be the issue.

The incidents most often occur when I try to accelerate after vehicle is stopped at an intersection. The car hesitates during acceleration regardless of how much I push the gas. Once it starts to go, it feels as though the car can't shift from 1st to 2nd gear. The RPMs get up 4500 while the car is going 25-40 mph and remain there for a few seconds up to ~20 seconds.  I am fearful of getting t-boned when my car hesitates while turning at an intersection, going through an intersection or pulling out from a parking lot. I have been stuck in several intersections when traffic was coming toward me, but thankfully those cars were able to avoid hitting me. I have reported the problem every time I take the car to the dealer for a service. The problem has been happening since I purchased the car in November 2024 and occurs randomly--sometimes every couple of months, sometimes days in a row. The dealer can't reproduce it, but they were able to pull a code from the transmission and found it had an acceleration error. They updated the software from a TSB, but that didn't help.

TOYOTA GRAND HIGHLANDER 2024 FUEL/PROPULSION SYSTEM

2024 Toyota Grand Highlander LE/XLE — vehicle data sourced from FuelEconomy.gov.

The 2024 Toyota Grand Highlander LE/XLE offers a powerful 362 hp hybrid engine with a 2.4L turbocharged system, delivering impressive performance. Enjoy efficient travel with a combined MPG of 24, supported by a front-wheel-drive drivetrain and an 8-speed automatic transmission.

	2024	2025	2026
Price	$43,070–$58,770	$43,070–$58,500	—
Engine Capacity	2.4L	2.4L	2.4L
Fuel Type	Regular	Regular	Regular
Transmission	8-speed automatic	Automatic (S8)	Automatic (S8)
Body Type	SUV	Standard Sport Utility Vehicle 2WD	Standard Sport Utility Vehicle 2WD

Toyota Grand Highlander LE/XLE (2024) Specifications