2026 Toyota Grand Highlander Engine Problems

“My Toyota Grand Highlander Hybrid Limited has 16000 miles. Yesterday, 5 vehicle alerts appeared simultaneously: Check Engine, AWD system, Drive-Start control system, Intelligent clearance Sonar, and Hybrid system. The vehicle has reduced power and check engine light is illuminated. I towed the vehicle to dealership. They found damage to inverter radiator causing a leak of coolant. Dealership mentioned that this could be because of flying debris hitting the vent. I am requesting a goodwill technical review and repair of the same. …”

“I purchased this vehicle new from Toyota of madison in Indiana on 3/26/2026. It had 300+ miles on it. Had it for just a week before this warning light came on while idling or driving very slowly..… High Coolant Temp. Pull over in a safe area immediately. My temperature gauge was in the red. I pulled over. Called closest dealership who stated closed for Easter. After several hours of personal researching on the internet of a potential cause , I examined the engine only to find that my Radiator Fan had been UNPLUGGED!! No wonder the engine was overheating. …”

“Dear NHTSA, I am writing to formally report a potential safety defect involving the front grille design of my 2026 Toyota Grand Highlander Limited. Fortunately, my vehicle has not experienced any damage or mechanical failure related to the grille at this time. However, after examining the design of the front grille and the components located directly behind it, I have serious concerns that the relatively large grille openings may allow rocks and other road debris to pass through and strike critical cooling components, including the radiator and other heat exchangers. …”

“road debris entered into front grill though the holes in grill adn damaged condensor fins causing vehicle to loose propulsion. Vehicle would not travel over 25 mph after the incidnet. This is safety issue as vehicle slowed from 55MPH to 25MPH rather abruptly on highway. Multiple lamps came on dash at time of incident and were reatained untill fixed (non warranty repair)”

“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. …”