Toyota Grand Highlander Fuel System Problems

Fuel System complaints by model year

Mileage when the problem started

What owners report

Failed System: Fuel Injector Failure (?) at high speeds, under load (uphill), causing an immediate and life threatening loss of power. While traveling on the highway, going up mountainous areas, the vehicle loses power and shakes violently. During multiple repairs/visits, the dealerships state that it is the failure of fuel injectors. They are replaced, and it happens again with the same explanation. Safety: Three times my family has lost power at 70mph while traveling uphill surrounded by many cars. The last event ended in a a scary and close interaction with an 18 wheel truck that was unable to stop as we lost power. Dealer Confirmation: The dealer has confirmed, on two separate occasions, that the fuel injectors needed replaced. The vehicle has 3,000 miles on it. At 2,000 miles, damage was found to the fuel injectors. They were replaced and the car was placed back in my possession. …

Design flaw of front grille of vehicle causing major damage. Due to the large gaps in front grille, the vehicle is susceptible to rock damage to the coolant system. Under normal highway driving, coolant started to leak and immediate power loss put my wife at risk. She was unable to accelerate to maintain speed while on a busy highway. There are no immediate signs for damage since any small rock can pass through the grille and create multiple punctures. You don't know something is wrong until symptomatic and then your placed at risk and also others around you.

The component that was available for inspection was our gas tank. It provided a profuse smell of fumes coming out of the tank and/or exhaust. You could also see vapors coming out of the gas tank when driving. The fumes alone are extremely toxic and extreme levels. The safety of me, my two young children and husband is all at risk. The smell of the gas and the view of the vapors from the gas tank puts the vehicle at an extreme fire risk. The smell of the fumes out it at a toxic inhalant risk - especially having two young children. This has caused great fear within me and the safety of my children is at extreme risk. No. I have taken the vehicle to the dealer 2-3 times, advised each time there is no issue with the vehicle. However, the smell of the gasoline has happened 6-8 times since purchasing the vehicle in May 2025. The vehicle has only been inspected by the dealer. …

After a complete stop at a stop sign there is hesitation/stalling when trying to accelerate. Sometimes the hesitation is several seconds and then the engine kicks in and lurches forward. Couple times this has been a safety issue as it happens when I'm trying to pull out on a busy road. The delay/hesitation has caused me to almost get hit a few times. There are no lights or warning messages when this happens. It happens a multiple times a week especially during hot weather when AC is on full (LO temp setting and maximum fan) and is usually during the first few minutes of operation usually at the same stop signs on my route to pickup my kids after the car has been sitting unused overnight. I also notice that the hybrid battery indicator is usually always at 3 bars. Dealership hasn't been able to reproduce as it's a very specific scenario (not driving/in garage overnight and short drive). …

The contact owns a 2024 Toyota Grand Highlander. The contact stated that while driving at an undisclosed speed, there was an abnormally strong gasoline odor inside the cabin of the vehicle. The contact believed that the odor was caused by a fuel leak. The vehicle was taken to a dealer, where it was diagnosed with an evaporator filter failure, and it was determined that a fuel leak was not the cause of the odor. The dealer stated that the vehicle did not require a repair and could still be driven with the odor inside the vehicle. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 45,000.

The contact owns a 2024 Toyota Grand Highlander. The contact was unable to fill the fuel tank completely. The contact stated that the fuel tank had a 17-gallon capacity; however, the contact was only able to get more than 10 gallons into the tank. Additionally, the contact stated that the Auto START/STOP feature was not functioning as needed. The contact had taken the vehicle to a local dealer, who was unable to determine the cause of the failure. The vehicle was not repaired. The manufacturer was not informed of the failure. The failure mileage was 16,455.