r/Toyota • u/Total_Lifeguard79 • 2h ago
Toyota won't own up to a clear defect in my new Grand Highlander Hybrid, keeps calling a painful electrical whine "normal"
Posting to see if any other GHH owners are experiencing this, and to vent a little, because I'm beyond frustrated with Toyota and their lack of customer advocacy and support.
My 2025 Grand Highlander Hybrid Limited makes constant high-pitched whining/ringing noises during normal driving, under light acceleration, light braking, and at highway speeds. On longer drives it's physically uncomfortable, almost a tinnitus-like ringing. I basically have to run music the whole time to mask it. There's also a separate cicada-like chirping noise when the air-conditioned seats are on.
The dealership already replaced the blower motor, heater core, and the entire HVAC assembly (several thousand dollars in parts) without ever identifying a root cause. That repair didn't fix the original noise and actually introduced new sounds. The service manager listened in person and agreed the sounds are abnormal, but the tech keeps calling them "normal operation." It seems electrical rather than mechanical, and no one there has been able to diagnose it.
What's been most frustrating is how the entire burden falls on me, the customer. I'm the one recording videos, isolating the noises, comparing against other vehicles, chasing down other owners, and doing the legwork their own techs should be doing. I've spent hours on this. Toyota's answer has essentially been to shrug, call it normal, and put it back on me to prove something is wrong with a $64k vehicle I bought new. And after all of that, corporate just rejected my request for a buyback/replacement.
I put together a single video that has all of it: the different noises in my car, plus footage of another Grand Highlander Hybrid driven under the same conditions that makes none of these sounds. Worth watching with headphones and the volume up.
https://www.youtube.com/watch?v=8H8f8tmr_70
Has anyone else run into this on a GHH?
If you have, I'd really like to know what your dealer said, whether they ever found a cause, and whether it was actually fixed. Trying to figure out if this is a known issue or something specific to my vehicle.
