2017 Toyota Highlander Electrical System Problems

After getting gas, the vehicle will not start. It will crank and crank but not turn over, like it is starving for gas. Then after 10-15 minutes it will start barely and to keep it running I have to floor the accelerator. Any other time it starts just fine. There are also no codes causing a check engine light.

Formal Complaint to NHTSA – Summary I am submitting this formal complaint regarding repeated mechanical and electrical failures involving my 2017 Toyota Highlander, purchased as a Toyota Gold-Certified vehicle with an extended Platinum Warranty. Despite strictly following Toyota’s maintenance guidelines and using only certified dealerships for all services, the vehicle has become inoperable multiple times, requiring five separate tows and resulting in repair costs exceeding $10,000. In June 2025, a Toyota dealership replaced the engine after diagnosing a warped head due to water pump failure. Following this, the vehicle began experiencing repeated charging system failures and electrical malfunctions. Multiple components—including the alternator, battery, and sensors—were replaced at another Toyota dealership based on ongoing issues, but the problems persisted. On September 2, 2025, a Toyota technician identified a missing ground wire nut as the likely root cause of these electrical failures. He confirmed the issue originated during the engine installation and that the unsecured ground caused system malfunctions. After repairs, the vehicle was again returned with a loud engine knocking noise, later traced to an improperly secured component from a prior repair. These events have raised significant concerns for the safety of myself and my family. Improper installation of major components and misdiagnosis by certified service providers have led to hazardous driving conditions, unexpected vehicle shutdowns, and unnecessary costs. I am requesting that the National Highway Traffic Safety Administration investigate this matter for potential safety defects related to improper engine installation, grounding failures, and faulty electrical diagnosis by certified Toyota service centers. Documentation, invoices, and repair records are available upon request. Thank you for your attention to this critical safety issue.

Car is shaking heavily when stopped. Several misfires while engaging the brakes. Mechanic is telling me that he has seen many vehicles of this model with faulty purge valves.

With 22k miles on vehicle, car won’t start due to Brake power low fault. Battery was replaced in attempt to rectify problem with no success, vehicle will need to be towed in for repair.

As the electronic back hitch was closing, I pressed the Start Engine button and the vehicle dashboard lit up but would not start. Then I pressed the button again and it said the Ignition is On. Pressed again to shut off. Vehicle made a bunch of clicking noises but would not start. Disconnected battery to “re boot” electrical system… but a charger on battery and then the vehicle started. BUT the ! And Check Engine light was now on… saying take to your dealer… Check AWD. Drove vehicle at lunch time… and warning light and check engine light just went off! So weird!

2017 Highlander with the Auto Start/Stop. It will sometimes go completely dead when idling, like at a stop light. Completely dead meaning zero electricity - no lights. This will last a couple of seconds. But one day, the car died at a stop light right. No power. Completely dead. Couldn’t turn on my hazard lights Gears were stuck. Couldn’t shift gears.

Hi- i have always upkeep the maintenance on my vehicle and take pride taking care of it . But now out of nowhere my vehicle throttle was loose the mechanics can’t explain why and now the transmission is not working i have explained to them them driving the car does seem to stop them feels like it wasn’t to accelerate while driving. I don’t know if anyone else have reported this issue but it doesn’t make sense that for a vehicle le that’s been greatly taken care of the transmission is went out .

While braked at a red light, my vehicle completely turned off. The engine would not restart, and all electrical panel light indicators did not come back on. I could not even turn on my hazards. The whole car was dead. After about a minute, I was able to restart the vehicle, but it took 5 attempts. I changed my battery two months ago, and just had my car checked by a mechanic and nothing was found to be the problem. No warning lamps or other messages were displayed. About 6 months ago, my car did something similar to this and stalled on the freeway in bumper to bumper traffic. However, this time the electrical panel light indicators came back on. No warning messages displayed. The car restarted after only one try. This is really dangerous to have a vehicle loose all power and completely die out!

I had my battery replaced about 3 days ago at the Toyota dealership . Yesterday, I was stopped at a red light and when I attempted to drive, the vehicle stalled. “Braking power low” message on the dashboard and the car would not restart. I was able to jump start it after about 30 minutes. I got towed to a local repair shop who could not identify or duplicate the issue. I had no warning indicators other than failing to start the morning of getting the battery replaced 3 days ago.

While accelerating onto highways, my Toyota Highlander suddenly misfires, causing rough engine and a natural response to decelerate instead of continuing to accelerate. The ignition coil was blamed, I replace and then a week later it happens again while trying to accelerate on the highway. Another replacement and then it happens again a third time. There was a known issue under Toyota’s TSB 0148-19, where engine computers were reprogrammed and all coils replaced. My vehicle model year and engine model but doesn’t show this TSB. I am aware TSBs are not recalls, but the sudden repeat engine misfires, all in a year, while accelerating to highway speeds, is a concern.

This is the SECOND incident with this vehicle in the past 4 months. When going to start my vehicle, it would not start. It gave me this error message: Braking power low, Stop in a Safe Place, See owners manual. There is NOTHING about this in the owners manual. The first time I thought it was battery related and after 3 different chargers on my vehicle, it finally started. Tonight I proceeded to push the button without the foot pedal and the radio came on, so it is definitely not the battery. I've tried several times to start and to no avail. Problem has not been reproduced as i cannot drive my vehicle at this time. No inspection as of yet. No warnings or symptoms prior to failure. Research shows it may have to do with a fuel pump pressure issue. I have paperwork on this issue under a customer support program 23TE01. Hoping this can become a recall and i can get this fixed .

On Aug 28 2023 I drove my car to Cumberland’s for a coffee (.9miles/3m away) on my way back at a stop sign, before turning left onto 129, my car shut off. I pushed the engine button, it restarted & I made it back to my house. Since owning this car this same situation has happened randomly several times, brought it to the dealers attention, not happening at the time, cannot be replicated, nothing was done. I remember being on a hill on 129 at a red light & the car shutting off loading control thinking I was going to roll into the car behind me I pulled the e rake since this was a repeated issue, the car started when I pushed the ignition, another time this happened at a red light not on a hill as well as the highway off ramp in stopped traffic. We eventually replaced the battery clearly that’s not the issue since it has continued to happen. Sometimes my radio will randomly shut off, sometimes it reboots & i get nervous & prepared for my car to stall or shut off which creates a distraction driving. I may have a video of one of these times that I took to show my husband. I do have a video of the radio shutting off that I can provide an alternate way as your system does not except video files.

Braking power low message on the dashboard and the car won’t start

Within 6 months of purchasing this car used at a Toyota dealership, the check engine, exclamation light, and "Go to dealership/check AWD" lights came on. I took it to the dealership who told me it would cost $250 just to check the lights. I took it to a car parts store who said "it's throwing a bunch of old codes". The dealership also suggested during oil change about $800 worth of work needing to be done and said my warranty I purchased would not cover it so I left. I had the fuel system flush done somewhere else.The lights went off for about a week and then came back on. About a month later.... While driving down the highway at a speed of approximately 60 mph, the rpm's and speedometer went haywire - jiggling and then decreased (and a weird sound like the car revving) even though foot was on gas, the car rapidly lost power and had to pull over on side of highway at night - this is of course very unsafe. Had to pull over and turn off car. Would not start right away but did after a few minutes. Took to mechanic - they could not find anything wrong. Could not reproduce. A few days later, after getting gas, car would not start. Had to wait an hour and then it did. Took back to mechanic, discovered water on spark plugs so had spark plugs replaced. Four days later, all the warning lights back on and car running roughly (like maybe lightly missing?). Component or system failure cause still unknown and yes it is available for inspection. Very frustrated and frankly a bit terrified to drive this very expensive vehicle.

Car shut down multiple times while driving. Car lost steering and all power then somehow came back to life without me touching anything. It’s as if the car decides to shut down when All Wheel Drive kicks in. First the entertainment system shuts down and then the entire car shuts down.

My Highlander was off and parked in my driveway. I was inside my home and I heard what sounded like a car alarm that was cutting out. I went outside to find out it was my car. However, it wasn't the alarm. It's a completely different pitch/tone that the car horn or the panic button. I proceeded to unlock the car, turned the car on and off a couple times, honked the horn, opened and closed the hood, etc and whatever sound was going off continued to go off even while the car was on. Whatever it was sounded like it had a short in it. Even my neighbors came out of their home. The sound eventually stopped and I went inside. 20 minutes later the sound started again. After it stopped, it happened again, for a short period. It was on a Saturday after dealerships were closed. The next day it happened again in the evening. It stopped right as I got outside. It's a nusiance to myself and my neighbors, it's loud, it's embarrassing, and the fact it continues to sound when my car is on concerns me because if it starts sounding while I'm in traffic or on the highway, it could cause major safety issues. No lights on the dash, battery tested good, literally no explanation.

When stopped at a stop light and using the auto off feature the Highlander stalls. The automatic shutoff repeatedly keeps draining the battery unless I manually turn the automatic shutoff feature off so it does not shut off when the vehicle is stopped. This has continued to happen over the last year and a half.

2017 TOYOTA HIGHLANDER VIN: [XXX] I purchased my Highlander new in 2017 and I have had consistent electrical issues. The radio has consistently fluctuated between bass, treble, and off for no apparent reason. I have taken my vehicle to the dealer 4 times and still no change. I have replaced the battery 3 times although I only have 25,000 miles on 55,000mile tires, the tire treads are wearing quickly. I rarely go anywhere and when I do it is on smooth surfaced, well-maintained roads. All maintenance is completed at the dealership, including rotation and balancing. I really so annoyed and I see by the comments that I am not alone in these issues. I'm not even going to get into the plastic chrometek wheels. However, Toyota states there are no problems. INFORMATION Redacted PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6).

I was driving home and a warning brake light came on which said breaking power low stop in a safe place, BSM not available. Car won’t start again, ABS light, traction control light, all wheel drive system, engine brake light, antilock brake system. All of these alerts are on the dashboard.

The vehicle simply would not start after I returned to my car from shopping. It had power but when I pressed the break and pushed ignition button multiple error messages came up that said "Charging system malfunction" then "Braking power low" then "SBS Airbag System Malfunction". The lights on the dash flickered, so i turned it off. When i turned it back on (before pressing the brake and pushing the ignition button to start) there was power, but the engine didn't turn over. My child and I were stranded at the grocery store waiting for the tow truck for over an hour, and then for a ride home. If this had happened while traveling further this would have put us in a real bind, and if it would happen while driving could be extremely unsafe. The car was towed to the Dealer (Russ Darrow in West Bend) who is claiming the battery needs to be replaced (i bought this vehicle 10 months ago- he said the cold cranking amps were at 520-540 at that time and were now at 297), he confirmed the alternator was healthy. As of now it looks like they will just be replacing the battery, so yes the vehicle system should be available for inspection upon request. My fear is that this could happen again after replacing the battery just like many other Toyotas that have had this exact same issue. There was no warning light that the battery was low. No indication of an upcoming maintenance issue. It happened abruptly.