2019 Toyota Highlander Electrical System Problems

My transmission is now missing the 3rd gear and left me and my kids stalled in traffic as I was turning in oncoming traffic. Toyota dealership confirmed that was the problem upon inspection.

The contact owns a 2019 Toyota Highlander. The contact stated that while driving approximately 30 MPH, the vehicle stalled; the contact shifted the vehicle into park(P) and restarted the vehicle for the vehicle to return to normal operation. No warning lights were illuminated; however, the “Auto START/STOP Failure” and “See Dealer" messages were displayed on the instrument panel. The failure reoccurred on several occasions. The vehicle was taken to a dealer, where it was diagnosed, and determined that the wiring harness needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was approximately 86,530.

Tramision it no good make nose and power go off transmisión lose power and make smoke

The car randomly shuts off, while waiting in line or when the break is depressed. The vehicle won’t start, battery is completely dead and then comes back randomly.

What component or system failed or malfunctioned, and is it available for inspection upon request? 12V battery How was your safety or the safety of others put at risk? Vehicle unable to start. Has the problem been reproduced or confirmed by a dealer or independent service center? Yes Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? Inspected by independent service center. Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? No warning of impending failures. 2/17/2020, vehicle purchased new from Toyota of Morristown (NJ). 2/23/2023, vehicle's (3 year old; 1 week outside of warranty) original OEM 12V battery failed and was replaced with Toyota OEM 12V battery (Part #2880031291) by independent service center ($376.61). 12/18/2025, vehicle's (less than 2 year old) replacement Toyota OEM 12V battery failed and was replaced with Toyota OEM 12V battery by independent service center ($407.88).

This is the second time this year 2025 my Toyota Highlander 2019 stalled fist in the middle of of intersection and second on the drive thru in in&out. Suddenly my car died. Tried to turn on followed the on screen instructions but the car failed to turn on. The first time it happened in the middle of the intersection while waiting for the light to change, after the issue I when straight to a car shop and oreilly they have this machine to check any possible issues and he said nothing shows in his machine but he think it’s the battery but I told the guy my battery and on the car shop Midas same result no major issue found and one of the technicians says It could be the auto shot off features, that must be manually turn off since this will automatically turn on. The second incident in In&Out the car died suddenly, tried to turn the car but it was on Drive so change to stop then tried to turn on multiple times but faulted , the crews decided to help us push the car out of the drive thru since we are blocking all the customers car, the steering wheel so stiff could hardly turn. We can’t change gear from stop, I was told to push off and on manual break foot pedal and this this help able to change gear to neutral, so we can push the car out of the drive thru. No message or failure message in the screen. We just push the car in the parking lot. Tried to turn on but failed. One of in&out staff was so kind to help us, he has a portable jumpstart and the car able to start. Able to drive home safe. Now I’m afraid to turn on my car or drive far distance due to this issues.

Clog of evaporator box caused water intrusion into vehicle. Water leaked onto Airbag ECU causing malfunction and requiring replacement of Airbag ECU.

Upon expiration of the SOS Subscription the DCM creates a loud feedback noise that goes through the passengers speaker and is causing hearing loss every time the vehicle is turned on. Has been documented many times on Reddit from other owners of 2019 highlanders

When I start the Highlander, there is a loud (hurts your ears) feedback noise through the speakers, and the red and green lights near the SOS button flash multiple times. This happens intermittently, and when it doesn't happen the SOS button only flashes red/green once. My wife, the primary driver of the car, has slowly developed tinnitus and this is the only loud, ear piercing, noises she have been exposed to. This noise can also bring on extreme headaches. I can't imagine the damage it could do to a child. We have tried to get this fixed at the mechanic and Toyota says the part is backordered. When we go to Toyota they state they have not heard of the issue. When we search the internet it is easy to find threads of this same issue on the same model, Toyota seems to be hiding this is a known issue.

Radio head unit keeps resetting. While using navigation. Disturbing driving. Something it will continually loop resetting. Can not determine consistent cause. Would like a free replacement and or upgrade including navigation

Complaint Regarding DCM Module Failure in 2019 Toyota Highlander Platinum Our 2019 Toyota Highlander Platinum is experiencing severe audio system malfunctions, beyond simple Bluetooth and connectivity failures. The vehicle sporadically emits an extremely loud screeching feedback sound upon startup and at unpredictable times while driving. This deafening noise is highly distracting to the driver, posing a significant safety risk. Toyota has been aware of this issue for years and documented it in Technical Service Bulletin T-SB-0112-20, which identifies the faulty vehicle assembly locations. However, despite widespread reports from owners and the high cost of repairs, Toyota has failed to issue a recall. Given the clear safety hazards associated with this defect, I firmly believe Toyota should recall affected Highlanders and provide immediate replacements for the defective DCM module. Owners should not be forced to cover costly repairs for a known issue that compromises driver safety.

[XXX] Dear staff there are other people complaining of ENGINE MISFIRE also [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Dear Staff, after SEVERAL payments made for DIAGNOSTICS i feel like I should commit suicide maybe because of this TOYOTA I can not afford to pay DIAGNOSTICS every single day to HEAR the SAME STORY over and over I understand there is a ENGINE CHECK LIGHT, I need it repaired PLEASE instead of having to pay DIAGNOSTIC FEES which ADVANCE AUTOPARTS doesnt even charge and TOYOTA takes $172 DIAGNOSTIC FEES when they can not even themselves RULE OUT the PROBLEM in their ENGINEERING or MANUFACTURING PLEASE look out for similar issues, ENGINE problems in 2GR-FKS engines as more people experiencing issues will CONFIRM its TOYOTA's fault They should either shut down their manufacturing in Japan or BRING BACK the STANDARDS of JAPANESE AUTOMOTIVES

When starting the vehicle, and extremely loud feedback noise is emitted from the front right speaker. This happens intermittently. Sometimes it's every 5th time you start it, and sometimes every 29th start. This started happening after the dealer-provided SOS Safety subscription expired. The noise is extremely loud and very disturbing especially for individuals like our daughter who has special needs. I would not be surprised if it is damaging our hearing. It would likely be especially harmful to children! It has been confirmed by the dealer and is currently back at the shop whule they are further investigating the cause.

Upon starting the Highlander, there is a very loud screeching/feedback noise through the speakers- it appears to be coming from the DCM as described y a Toyota representative. . This happens upon stating the car at least once a day and frequency is increasing.

Extremely loud high pitched noise when the vehicle starts. The problem began early October 2024 and has continued. It happens every time the car turns on.

When I start the Highlander, there is a loud (hurts your ears) feedback noise through the speakers. It's so loud you instinctively close your eyes and put your hands on your ears, ignoring whatever you were doing before (like maybe putting the car in gear). It lasts a second or two then stops. It doesn't happen every time, more like every 10 starts. I called Toyota and they said take it to the dealer. I'm still waiting to get their feedback.

Intermittent EXTREMELY LOUD ear-piercing high pitched noise coming from speakers upon starting the vehicle. The volume of the sounds is extremely high, the loudest noise I've ever heard. The sound lasts about 5 seconds. I am concerned for the safety of our hearing, for my family, including our children. It has not been reproduced at the service center because it is intermittent. I have read online where others with the similar year/make/model experienced it and have varying success by re-subscribing to Toyota SOS Safety connect ($80/year), or replacing the Data Communication Module (DCM). If not uner warranty, this costs thousands of dollars. I have tried re-subscribing to the Safety Connect but it does not work, and the dealer wants me to pay additionally for them to see why this safety feature is not working in my car. There is no warning before this loud sound presents.

Was stuck in traffic on a highway for about 25 minutes going 0 miles per hour because of an accident about 5 miles away. Then the traffic started to clear and began driving on the road again. About five minutes later, the vehicle lost full drive abilities and the check engine light came on, traction control light on, brake light was on, ABS light was on, stability control warning light on, and then on the info screen the vehicle stated, "Hybrid System Malfunction Stop in a Safe Place, See Owner's Manual", screen then showed within 2-seconds, "Pre-Collision System Malfunction Visit Your Dealer", then in about 2 additional seconds later the info screen stated, "Check Engine Visit Your Dealer", then most every waring light turned on, and there was no power for drive with either hybrid or gasoline engine. The vehicle basically came to a sudden halt in the middle of traffic with steering wheel locked and no control. Had to get police involved and a tow to get off the road. Had vehicle towed to a local toyota dealership and they do not open until Monday at 9am. This incident occurred on Saturday around 3pm.

When starting the 2019 Highlander, the car would intermittently emit a screeching noise. This noise is startling and can potentially cause a crash if it is emit while driving. This is a known issue since it made to the Toyota Forum: [XXX] However, when I brought the car to the dealership, they’re stating that they don’t know about the issue, and want to charge $300 just to diagnose the problem without guarantee the fix or acknowledge the known issue. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)