2018 Toyota Highlander Speed Control & Cruise Problems

1. What component or system failed or malfunctioned, and is it available for inspection upon request? The issue involves the Dynamic Radar Cruise Control system (vehicle-to-vehicle distance control mode) in my 2018 Toyota Highlander. This system automatically cancels when the vehicle’s speed drops to approximately 25 mph (40 km/h) or below. The system disengages without driver input during normal driving conditions such as heavy traffic or congestion. The component remains functional but poses a safety concern due to its operational design. The vehicle and system are available for inspection upon request. 2. How was your safety or the safety of others put at risk? This malfunction creates a significant safety risk when driving in stop-and-go or congested traffic. The sudden loss of adaptive speed control forces the driver to quickly resume manual braking and acceleration, which can cause delayed reactions and potential rear-end collisions. The unexpected disengagement may also confuse drivers, especially those relying on the system to maintain safe following distances. This behavior increases cognitive load and the chance of driver error, particularly for elderly or less experienced drivers. 3. Has the problem been reproduced or confirmed by a dealer or independent service center? Yes. The issue has been observed and replicated multiple times during normal driving conditions, such as during city traffic or highway slowdowns. It is also acknowledged in the vehicle owner’s manual, which specifies that the system automatically cancels below approximately 25 mph. However, this design flaw has not been formally addressed or corrected by Toyota dealerships or service centers as a safety concern. 4. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? The vehicle has not been inspected specifically for this concern by Toyota or other third parties. However, the condition is consistent across the same model and year,

TL* THE CONTACT OWNS A 2018 TOYOTA HIGHLANDER. WHILE DRIVING 55 MPH, ANOTHER VEHICLE PULLED IN FRONT OF THE CONTACT'S VEHICLE IN INCLEMENT WEATHER AND SPLASHED WATER ONTO THE FRONT END OF THE VEHICLE. AS A RESULT, THE CRUISE CONTROL MALFUNCTIONED AND THE CONTACT'S VEHICLE EXPERIENCED UNINTENDED ACCELERATION. THE FAILURE OCCURRED WITHOUT WARNING. THE DEALER (PERUZZI TOYOTA, 2601 BETHLEHEM PIKE, HARTFIELD, PA) WAS CALLED AND A DIAGNOSTIC APPOINTMENT WAS SCHEDULED. THE MANUFACTURER WAS NOT NOTIFIED OF THE FAILURE. THE FAILURE MILEAGE WAS APPROXIMATELY 12,000.

TL* THE CONTACT OWNS A 2018 TOYOTA HIGHLANDER. WHILE DRIVING VARIOUS SPEEDS AND DEPRESSING THE ACCELERATOR PEDAL, THE VEHICLE WOULD NOT IMMEDIATELY RESPOND. APPROXIMATELY TWO SECONDS AFTER DEPRESSING THE ACCELERATOR PEDAL, THE ENGINE REVVED AND THE VEHICLE ABRUPTLY ACCELERATED FORWARD. THE VEHICLE WAS TAKEN TO CONICELLI TOYOTA (550 W. RIDGE PIKE, CONSHOHOCKEN, PA) ON SEVERAL OCCASIONS, BUT NO FAILURE WAS FOUND. THE CONTACT STATED THAT THE FAILURE CONTINUED. THE MANUFACTURER WAS NOTIFIED. THE FAILURE MILEAGE WAS 3,450. *AS THE CONSUMER STATED THE VEHICLE WAS TAKEN BACK TO THE DEALER 6 TIMES FOR THE SAME DEFECT. *TR