2021 Toyota Highlander: check engine light

Filed Sep 17, 2026 · Brakes, Electrical · 123,000 miles · CA

The contact owns a 2021 Toyota Highlander. While driving 20 MPH uphill, the messages "Engine Failure," "Brake Failure," and "Pull Over to A Safe Place, See Owner's Manual" were displayed, and several unknown warning lights illuminated. The contact turned off and restarted the vehicle, but the failure persisted. After a second restart, the message "See Dealer" was displayed with the check engine warning light illuminated. After a third restart, the vehicle was driving rough while the accelerator pedal was depressed. The vehicle was taken to the dealer. The manufacturer was notified of the failure by phone. The failure mileage was approximately 123,000.

Filed Jul 30, 2026 · Fuel system · AZ

On July 25, 2026, while driving my 2021 Toyota Highlander Hybrid at high speeds on the freeway, the vehicle experienced a sudden loss of drive power accompanied by a check engine light and a severe hybrid system error warning. The failure occurred without any prior warning or degradation in performance, forcing an immediate emergency maneuver through traffic to reach the shoulder. The vehicle was towed to Toyota of El Cajon for diagnostic evaluation. The dealership service invoice details the following findings: - Primary Failure: Primary fuel injector failure (direct injection system). - Diagnostic Behavior: The engine experienced severe cylinder misfires under load at freeway speeds when the direct injectors were commanded on. - System Impact: Engine misfires triggered a hard safety shutdown of the hybrid system, immediately cutting motive power to the wheels. - Repair Executed: Replacement of the failed fuel injector assembly Safety Concern: A primary fuel injector failure at highway speeds causes an instantaneous engine misfire under load, which immediately triggers a hard hybrid drive system shutdown. Cutting motive power suddenly in heavy traffic without advance warning creates an extreme hazard for rear-end collisions. I am requesting the federal safety agency document and investigate this failure mode and its automated system shutdown logic.

Filed Jun 11, 2026 · Airbags, Driver assistance · NC

Four days after I took delivery of this used vehicle (April 25, 2026), multiple warning lights appeared at once: BRAKE, ABS, PARK, Check Engine, Blind Spot Monitor Unavailable, and RCTA OFF. An independent Toyota dealership diagnosed the vehicle April 27-28, 2026 (approx. 109,000 miles) and found (1) water leaking into the rear hybrid battery area through a sunroof drain "installed incorrectly," causing a Brake System Control Module low-voltage code, starting issues, a headlight only partially functioning on one side, possible air in the brake system, and a musty HVAC odor; and (2) blind spot monitor fault code C1AC2 (Slave Module Horizontal Axis Misalignment) - the blind spot and rear cross-traffic monitoring systems do not function reliably. At a second visit on May 4, 2026, recalibration was unsuccessful; per Toyota procedure the only remaining option is replacing the right-rear blind spot sensor. The technician wrote the cause is a mystery, "whether it be body damage related or electrical short." Toyota service records show the same C1AC2 code was documented during the selling dealer's own pre-sale inspection, and that in December 2024 another Toyota dealership pulled the rear bumper and found the RR blind spot sensor bracket bent, causing incorrect readings - a recurring safety defect that prior calibrations and repairs have not resolved. Separately, federal safety recall 23V865 (occupant classification sensors; the passenger airbag may not deploy as designed) was open and incomplete when I purchased the vehicle and remains incomplete, and Toyota service campaign 25TD01 (rear traction motor cable corrosion) is also outstanding. The defect has been reproduced and confirmed by two Toyota dealerships, reported to the selling dealer in writing, and reported to Toyota's customer-care center. The vehicle is available for inspection upon request. No crash, fire, or injury.

Filed Jun 6, 2026 · TX

Car has stopped while pumping gas seems to be specifically after rain. There was a heavy rain and immediately after while pumping gas car was not able to start. Received message steering power low. Happened 3 times after first incident while pumping gas. Car was checked by a mechanic and believe it might be a defect with a part called purge flow ? After part was inspected all check engine lights and alerts on cars went away for a few weeks. Once again we had light rain and the same issue restarted , with unable to power car after pumping gas

Filed Mar 29, 2026 · Transmission · NC

Transmission has started to whine, my understanding is this is common for the transmission I have. I have had this verified by 2 different garages. There are no engine lights showing. The noise started around 90K.

Filed Mar 10, 2026 · Fuel system · PR

*Component/System:** The **Fuel Pump / Fuel Delivery System** failed. The vehicle and the replaced spark plugs/coils are available for inspection upon request. **Safety Risk:** The vehicle **stalls abruptly while in motion (at speed)**, causing an immediate loss of motive power in traffic. This creates an extreme risk of rear-end collisions and leaves the driver stranded in active lanes of travel. The vehicle must be shifted to park, turned off, and restarted to temporarily "reset" the system, which is life-threatening in high-speed or heavy-traffic environments. **Confirmation/Reproduction:** The problem has been confirmed by an **independent service center**. Initial diagnostic codes led to the replacement of spark plugs and ignition coils; however, the stalling persisted. Subsequent diagnostic testing specifically identified the fuel pump as the point of failure, consistent with symptoms of known Toyota fuel pump recalls. **Inspections:** The vehicle has been inspected by an **independent mechanic**. It has not yet been inspected by Toyota corporate, the police, or insurance representatives, as no crash has occurred yet—though the risk is imminent. **Warning Symptoms:** The Check Engine light illuminated on January 21, February 21, Febuary 26, March 6 and March 10. Prior to the first total stall, the vehicle exhibited brief hesitations during acceleration. There were no specific "Fuel Pump" warnings on the dashboard; the vehicle simply loses power without a countdown or secondary safety mode (Limp Mode).

Filed Nov 3, 2025 · VA

Started with a transmission whining. Now is setting check engine light and jerking. Toyota knows there is a manufacturing defect in the UA80 transmission in these vehicles, but continued to sell them even after the released TSB# T-SB-0008-21, and refuses to repair this under warranty. Toyota is the only company offering replacement transmissions and therefore can set there own price to scam consumers. Please help us get a resolution.

Filed Dec 13, 2024 · Transmission · TN

The Highlander only have 62000, miles and still has a new car smell ,but it need a transmission was told by service advisor that it could stop in the middle of the of traffic with no warning no engine light on dash nothing upon further research a lot of customers are having the same problem Please help Toyota has been my brand since 1996 and I’m sad that the don’t stand behind the brand for such a major issue

Filed Nov 18, 2024 · Electrical, Engine · CA · fire

The Check Engine light came on and I took it into Toyota of Downtown dealership where I was receiving periodic maintenance. After 2 days, they said the light was out but they hadn't found the cause. I could either leave if for a few more days or take it and bring it back if the light came on again. This was early August. I chose to take the car & when the Check Engine warning light came on again, I took it in on Aug 15, 2024 before I left to Portland to give them more time. I returned on Monday & couldn't reach them. The next day they informed me that while on a test drive, there was a loud bang, it started smoking and by the time 911 arrived it was on fire. After a 2 month investigation by Toyota's Engineering Analysis fire inspection, they concluded Toyota was not involved. The dealership has not provided me with the report although I've requested it but they aren't accepting responsibility either although it was in their possession when the fire occurred.

Filed Sep 6, 2024 · Transmission · TX

Transmission/differential - Took my car in around 80k miles for a routine transmission service. I got my car back and it started making a whining noise when you accelerate. Never did I get a code, check engine light nothing. Took it back to get looked it since the sound never went away. I am being told it needs a new transmission. I was told my car transmission was too hot for them to even look at after sitting for 24hr parked! I have read and done a lot of research that this is a common issue and never has been recalled. Even a shortage now on transmissions with so many needing them now! My car is only 3 years old and won’t be covered.. this should have been recalled and or known to buyers before purchasing if it was known to have issues early 2021…

Filed May 16, 2024 · Acceleration, Engine · CA

While accelerating onto the freeway the vehicle suddenly loses power creating a serious safety issue. A check-engine light comes on but the safefy issue is that the vehicle goes into a power loss mode ON THE FREEWAY. A truck nearly rear-ended me the first time it happened. Toyota Service was unable to duplicate and so said National Toyota advised them to release the vehicle back to me. The same issue happened to my boyfriend and his son - total loss of power while accelerating onto the freeway. Then a mechanic recreated the issue 5 additional times (usually in the dawn hours when traffic was light due to safety concerns). Was unable to find the cause of the issue but a loss of power in a vehicle is as serious a concern as an unwanted acceleration. I am frustrated that Toyota is not taking this seriously.

Filed Apr 18, 2024 · FL · fire

I had been driving for about 20 minutes at approximately 50-55 MPH when the check engine light came on. Seconds later, the red hybrid malfunction message displayed and I lost the ability to accelerate. I was able to pull over and I saw grayish smoke and flames coming from under the hood on the right side. I exited the vehicle and called 911. It took moments from the start to being completely engulfed in flames. Several loud pops or explosions happened during this period. The police and fire department arrived and extinguished it.