2019 Toyota Highlander Electrical System

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

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).

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.

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.

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.

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.

The contact owns a 2019 Toyota Highlander. The contact stated that while the vehicle was parked and attempting to start the vehicle, the vehicle failed to respond as intended. The contact stated that the failure had been recurring, and the battery was replaced, as recommended by the local dealer; however, the failure persisted. The vehicle was taken to another local dealer where it was diagnosed that the START/STOP system was draining the battery. As a result of the failure, the START/STOP system was turned off. The manufacturer was made aware of the failure and referred contact to the NHTSA Hotline for assistance. The failure mileage was approximately 77,000.

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)

There is a loud, ear splitting sound that occurs at start up. It doesn’t happen every time but has happened multiple times since I’ve owned the car for 1 year. It is very loud—like a shrill feedback noise from a microphone.

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 once.

When I start my 2019 Highlander there is a loud screech that startles you and makes you jump out of your seat. It’s a very loud feedback noise through the speakers, and the red and green lights near the SOS button flash multiple times. This happens very often but intermittently, and when it doesn't happen the SOS button only flashes red/green once. This happened after the SOS trial service had expired. I called the SOS service and they told us to talk to the dealership. There needs to be a recall of the SOS module or whatever is causing this.

Random Battery Drain. Driver and passengers can be put in danger if car doesn’t start and vehicle is in an unsafe location. AAA replaced battery with a new one but the random battery drain problem continues to occur. No warning signs prior to dead battery. First appeared end of 2020/beginning of 2021. Internet search returns complaints for same problem from 2017 to present.

The contact owns a 2019 Toyota Highlander. The contact stated that while reversing out of a driveway, the vehicle began to jerk without warning. Once the contact reached the base of her driveway, the vehicle accelerated backward into a neighbor's tree. The air bags did not deploy upon impact. The contact called the ambulance where her daughter was transported to a hospital after she suffered a gash to the back of her head due to the accident. The contact and her daughter's friend both suffered whiplash as a result of the accident. A police report was filed. The contact was able to drive the vehicle back into her driveway where it remained in her possession. The contact called the dealer to check for recalls and was informed that there were zero recalls on the vehicle. The manufacturer had yet to be notified about the failure. The vehicle had to be repaired. The failure mileage was approximately 52,000.

THE VOICE GUIDANCE SYSTEM WAS INOPERATIVE. I BOUGHT IT AS A PRE-CERTIFIED 2019 HIGHLANDER FROM A TOYOTA DEALER WITH 16K MILES. AT THE TIME IT WAS WORKING THE STOPPED WORKING. AFTER 3WKS I FOUND OUT THAT I HAVE TO PUSH THE START BUTTON 2X WITH THE ENGINE OFF TO GET IT TO WORK. TOYOTA HAS KNOW ABOUT THIS FOR 2 YEARS BUT NO ONE INCLUDIJNG SUPPORT TOLD ME ABOUT IT! WILL THERE BE ANY RECALLS? IT IS TOO LATE TO TAKE IT BACK! I WILL HAVE TO DO THIS EACH TIME I USE THIS FEATURE.

THE COMPUTER/RADIO AUTOMATICALLY SHUTS ITSELF OFF AND THEN REBOOTS. IT HAS DONE THIS TOO MANY TIMES TO COUNT. IT DOES THIS RANDOMLY AND UNEXPECTEDLY. IT BECOMES DANGEROUS BECAUSE I LIVE IN A STATE WHERE I AM NOT ALLOWED TO HOLD A PHONE WHILE DRIVING, SO WHEN I DON'T HAVE WIRELESS PHONE CAPABILITY IT IS VERY DISRUPTIVE. IT IS ALSO DANGEROUS AND INCONVENIENT WHEN IT HAPPENS WHEN I'M USING NAVIGATION IN AN UNFAMILIAR PLACE, I AM LEFT STRANDED. THERE HAVE BEEN TIMES WHEN IT CONTINUES TO REBOOT CONTINUOUSLY DURING MY TRIP TO OR FROM SOMEPLACE. I HAVE BEEN TO THE DEALERSHIP 5 TIMES TO HAVE MY COMPUTER RESET/REBOOTED AND THE PROBLEM STILL OCCURS. THE SECOND TIME I TOOK IT, THE TECHNICIAN LEFT THE SERVICE TICKET OPEN SO THAT EACH TIME I TOOK IT AFTER THAT THEY WERE PUTTING THE "REPAIR" UNDER THE SAME TICKET SO THAT IT ONLY SHOWED AS 1 REPAIR! I NOW KNOW OF AT LEAST 5 OTHER PEOPLE HAVING THE EXACT SAME PROBLEM BETWEEN TOYOTA HIGHLANDERS AND TOYOTA 4 RUNNERS. MY VEHICLE HAS BEEN BOTH STATIONARY AND IN MOTION WHILE THE AUTOMATIC SHUTOFF OF THE COMPUTER SYSTEM OCCURRED. OF COURSE THE DEALERSHIP ALWAYS SAYS MY COMPUTER NEVER SHUTS OFF WHILE MY VEHICLE IS THERE, EVEN THOUGH IT DOES IT WHEN I DRIVE OFF THE LOT, SO I RECORDED VIDEO OF THE RADIO/COMPUTER SHUTTING OFF WHILE I WAS DRIVING AND SHOWED IT TO THEM. I WOULD HATE FOR THE PROBLEM TO ESCALATE OR BECOME MORE DANGEROUS.

IN NAVIGATION, IT WILL NOT GIVE VOICE DIRECTIONS WHICH IS A SAFETY HAZARD CAUSING YOU TO LOOK AT THE SCREEN AND TAKING YOUR EYES OFF THE ROAD. I TOLD TOYOTA ABOUT THIS BUT NO FIX. THIS IS DANGEROUS AND NEEDS TO BE FIXED IMMEDIATELY. THIS OCCURS WHEN STATIONARY OR MOVING. THIS HAPPENS EVERY TIME YOU TRY TO USE NAVIGATION.

THE VOICE COMMANDS FOR THE VEHICLE DO NOT WORK WHICH REQUIRES THE DRIVER TO LOOK AT THE NAVIGATION SCREEN OR SCROLL THROUGH THEIR PHONE BOOK RATHER THAN USING THE BLUETOOTH FEATURES. THIS IS VERY DISTRACTING AND ILLEGAL IN SOME STATES WHICH REQUIRE HANDS FREE PHONE.