Toyota 4Runner 2025–2026Common problems, reliability & repair costs

Symptoms: Loud squeal from the front brakes, most noticeable when backing up cold — embarrassing-loud, per owners. It's the single most common early complaint: 15+ of the first ~48 NHTSA complaints on the 2025 4Runner are this noise. Braking performance itself is not affected.

Fix: Toyota issued TSB T-SB-0046-25 (July 2025) for 4Runner and 4Runner Hybrid — revised front brake hardware installed free under the 3yr/36k basic warranty. Some owners report the squeal returning until the full TSB parts were fitted. Out of warranty this becomes an ordinary pad/hardware job. Annoyance, not danger — but get it documented at the dealer while it's free.

Sources: NHTSA complaints — 2025 Toyota 4Runner (brake squeal is the top category), 4Runner6G — official brake squeal TSB fix (T-SB-0046-25), OEMDTC — Toyota T-SB-0046-25 service bulletin

Symptoms: At startup, the digital instrument panel can fail to display vehicle speed, brake-system warnings, and tire-pressure warning lights. You may notice a blank or partially blank cluster after turning the truck on.

Fix: Free under NHTSA recall 25V595000 (Toyota 25TB08/25TA08): a software update, delivered over-the-air on most trucks or at the dealer. Owner letters went out starting December 2025 in phases. Nothing to fix yourself — just confirm by VIN that the campaign is closed on any truck you're buying.

Sources: NHTSA recall 25V595000 — 2025 4Runner instrument cluster software, Cars.com — 2025 Toyota 4Runner recalls

Symptoms: On the 4Runner itself: scattered owner reports of harsh or delayed shifting, low-speed clunkiness, and jerky gas/electric transitions on hybrids — no confirmed failure pattern yet. The reason it's on this list is the 2024 Tacoma, which shares this powertrain: early Tacomas suffered harsh shifting, trucks dropping into neutral, and outright transmission failures, which Toyota traced to manufacturing debris and addressed with TSB T-SB-0076-24 — replacing the transmission and torque converter on trucks that set specific fault codes.

Fix: Under the 5yr/60k powertrain warranty this costs you nothing — the Tacoma TSB replaced transmission assemblies free when the diagnostic codes were present. The number to fear is the out-of-warranty one: a replacement 8AT runs well into four figures at an independent shop. To be plain: there is no confirmed equivalent failure wave on the 4Runner as of mid-2026. We list it because the hardware lineage is identical and the smart move is a careful test drive plus a dealer code scan, not because your 4Runner is doomed.

Sources: TFLTruck — some 2024 Tacomas need a new transmission and torque converter, Motor1 — 2024 Tacoma transmission replacement TSB, 4Runner6G — Tacoma transmission TSB discussion among 6th-gen owners

Symptoms: Rear spoiler rattle against the liftgate is the signature one; owners also report window and interior trim buzz, and NHTSA complaints describe front air dam and underbody fasteners backing out — in a few cases panels dislodged at highway speed. A persistent rear-seat-reminder nag and occasional wireless CarPlay drops round out the small stuff.

Fix: Dealer fixes under warranty: felt tape or upgraded grommets for the spoiler, re-seating and re-torquing loose trim and underbody hardware, software updates for the electronics nags. None of it is expensive; all of it is the tax of a first-year truck. Walk the truck and check fastener tightness at every service until the pattern ages out.

Sources: Trail4Runner — top complaints about the 6th-gen 4Runner, NHTSA complaints — 2025 4Runner (structure/fastener reports), 4Runner6G — '3 months in, noticing some issues' owner thread

Tools: None for the airbox (clips); small screwdriver helpful for the glovebox stops

1. Unclip the engine airbox lid in the engine bay, lift it, and swap in the new panel filter with the seal seated all the way around.
2. Re-clip the lid — on a turbo engine an unsealed airbox matters more, so make sure it's fully latched.
3. Open the glovebox, squeeze the side stops, and let it swing down to expose the cabin filter door.
4. Slide the old cabin filter out and insert the new one with the airflow arrow pointing the right way (marked on the housing).
5. Close everything up and note the mileage — every 10k for the engine filter in dusty use, 15–30k for the cabin filter.

Tools: Trim tool or plastic pry tool, Isopropyl alcohol and a rag

1. First choice: let the dealer do it free under warranty — this is a documented first-year fix. DIY only if you're out of warranty or done waiting.
2. With the liftgate open, press on the spoiler and lower trim panels while a helper watches for movement — find exactly where plastic meets steel and rattles.
3. Clean both contact surfaces with isopropyl alcohol and let them dry.
4. Apply thin adhesive felt tape (or upgraded rubber grommets) at each contact point so the plastic rests on felt, not paint.
5. Re-seat the trim, close the liftgate, and test over the same rough road that exposed the rattle.

Tools: 10mm wrench or socket

1. On i-FORCE MAX hybrids the 12V battery is in the rear cargo area on the driver side, not under the hood — pull the cargo trim panel to access it.
2. Attach the maintainer's SAE ring terminals: positive to the positive post first, then negative, torquing snug with the 10mm.
3. Route the pigtail so it exits the trim cleanly and the cargo panel closes without pinching the wire.
4. Plug in the maintainer whenever the truck will sit more than a week or two — owners report weak 12V batteries on hybrids that sit, and a dead 12V strands a hybrid just like a regular truck.
5. Unplug and stow the pigtail end before driving.