Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2018 Toyota Highlander owners, lightly cleaned up (personal details are redacted by NHTSA).
The contact owns a 2018 Toyota Highlander. The contact stated while driving 70 MPH, the check engine warning light illuminated informing the driver that the AWD system and stability were disabled. The vehicle was taken to the dealer where they diagnosed the failure of the sub-assembly and the water temperature sensor needed to be replaced. The contact stated that he was informed that the onboard computer disabled the system due to the weather. The dealer informed the contact that the parts were on national backorder. The dealer performed a temporary repair by placing plastic on the grill to keep cold air out; however, the failure reoccurred several times. The manufacturer was notified of the failure and informed the contact that the parts were not covered under warranty. The approximate failure mileage was 48,000.
The contact owns a 2018 Toyota Highlander. The contact stated that while attempting to turn left or right, the steering wheel became difficult to turn. The check engine warning light illuminated, and the vehicle lost power. The contact waited for several minutes before being able to restart the vehicle. The check engine warning light remained illuminated. The failure had occurred several times and had become more persistent. The vehicle was taken to a certified mechanic, who diagnosed that the body throttle, air control system, and battery sensor had failed. The vehicle was repaired; however, the failures persisted. The manufacturer was not informed of the failure. The approximate failure mileage was 200,000.
The contact owns a 2018 Toyota Highlander. The contact stated that while driving at an undisclosed speed, the vehicle lost motive power after coming to a full stop at a traffic light. The vehicle was taken to an independent mechanic and the dealer; however, the mechanic and the dealer were unable to duplicate the failure. The contact related the failure to a faulty Auto Start/Stop feature. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 50,000.
I have a power steering warning light. Steering is harder than normal. I believe this vehicle is having the same power steering problem that Toyota Tundra and sequoias are having. I want it to be recalled and paid for by the manafacturer. This is ridiculous a well maintained vehicle.
Car is not properly wired to tow a trailer equipped with electric brakes. Toyota advertises the Highlander as having 5000 lb towing capacity. On the other hand, trailers weighing 3000 lb or more are required by law to be equipped with trailers brakes in most states. However, the Highlander's towing wire harness does not include the necessary wiring and 7-pin connector to power trailer brakes. Highlander OEM wiring harness only includes a 4-pin connector (which does not have output for a car-mounted brake controller nor 12V output to charge trailer's breakaway battery or power a trailer-mounted brake controller). Toyota's claim that the Highlander is capable of towing 5000 lb, but not equipping the car with essential safety equipment to do so is an unsafe condition (and false advertising). …
Unable to start vehicle twice. In both instances, foot was placed on the brake before pressing Start button and brake was extremely stiff. When Start button is pushed, electronics engage (control panel lights, A/C, etc.) but engine will not engage. In the first incident, car had been stopped to refuel and would not restart. Car had been started without incident and been running for approximately 20 minutes prior to stopping for refueling. Tried to restart the engine for 20-30 minutes unsuccessfully and had to have vehicle towed to authorized Toyota dealer. Dealer was unable to look at it for two days and was able to start engine on the first try two days later. Dealer could not replicate problem. In the second incident, car had been in a parking lot for two hours on a hot day. Again, brake was extremely stiff, electronics engaged but engine would not start. …
While driving the car at approximately 40 mphs the car suddenly jolted and stopped moving. Luckily no one was behind and I pulled over also noticing check engine light came on. I immediately called Toyota and was able to drive it to them. I spent $140 diagnosis fees for them to say it was ignition coil B. After replacing the coil the light and same problems continued. We took the car to another mechanic, spent $600 diagnosis fees to find out it is the ECM. We then contacted the Toyota dealer asking about previous recalls that were on the ECM for 2018 Toyota Highlanders which is our car. They stated our car based off the VIN has no recalls. How could this recall be for 2018 Toyota Highlanders but not for our 2018 Toyota Highlander with the same issues? Our car only has 80,000 miles.
1.) Bluetooth connects without issue to iPhone (for both media and phone) however during a phone call (incoming/outgoing) the car system will drop the call after about 2 mins of talk time. The phone then disconnects from the car & will only re-pair once the system restarts. 2. ) The safety hazard is due to distracted, hands required operation of the phone due to Bluetooth system not working properly 3.) The issue has been under 'warranty' for nearly 2 years at my dealer. There is currently no resolution. Dealer admits the fault is due to a compatibility issue of various vendors supplying the head unit, bluetooth/radio unit, and software. 4.) At the instruction of the manufacturer, the dealer has refused to replace any hardware.
Upon turning on the vehicle the brake peddle locked and the steering wheel. Message prompted "braking power low, stop in safe place". After that all electronic features failed and vehicle did not turn on at all. Vehicle wouldn't even lock. Mine and my families safety was at risk due to the fact that this could have happened while the vehicle was in motion and all steering and braking abilities are lost. The vehicle is scheduled to be seen. No warning signs/lampsor other symptoms where present prior to the incident.
I bought my car used. Only had it for 3years and already had to replace the battery twice. Once I was stopped at light turning left, yield to oncoming traffic, since my foot was on brakes battery just dyed in middle of light, police had to come made sure I didn't get hit. 2nd time car cut off at McDonald's drive thru and battery went dead again. Something is wrong with batteries that make them go bad, n it's unsafe bc I've got stranded twice in not.so good places..
Electrical complaints in other Highlander years
Frequently asked questions
How common are electrical problems on the 2018 Toyota Highlander?
NHTSA has 24 complaints about the electrical system of the 2018 Toyota Highlander, 9% of the model year's 269 complaints.
Is there a recall for 2018 Toyota Highlander electrical problems?
No. NHTSA lists no electrical system recall for the 2018 Toyota Highlander, though it has 4 recalls for other components. If the problem is widespread, a repair may still be covered by an extended warranty or a manufacturer service bulletin — ask a dealer.
At what mileage do 2018 Toyota Highlander electrical problems start?
Half of the complaints with a recorded mileage happened before about 15,000 miles, and 55% before 25,000 miles.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.