What are the most common Toyota 4Runner problems?
According to Au7o's analysis of 1,986+ owner reports, the 2021 Toyota 4Runner has 10 documented issues. The most frequently reported are: KDSS (Kinetic Dynamic Suspension System) Leaks/Corrosion, A/C Compressor Failure, Front Door Lock Actuator Failure (Integrated Latch) Causing Doors to Not Lock/Unlock. None are rated critical, but regular maintenance is recommended.
Is the Toyota 4Runner reliable?
The 2021 Toyota 4Runner has 10 known issues documented across 1,986+ owner reports. No issues are rated critical, suggesting generally good reliability. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
How much does it cost to fix common Toyota 4Runner problems?
Repair costs for known Toyota 4Runner issues range from $0 to $4,000, depending on the specific problem and whether you choose DIY or professional repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 2010-2023 Toyota 4Runner KDSS (Kinetic Dynamic Suspension System) Leaks/Corrosion?
The KDSS hydraulic suspension system can develop leaks at the hydraulic lines and accumulators, especially in areas with road salt. The system helps reduce body roll on-road while allowing articulation off-road. Corrosion of the KDSS lines is common in northern states. Repairs typically run $300-$4,000. Severity: medium.
What is the 2010-2022 Toyota 4Runner A/C Compressor Failure?
The A/C compressor can fail prematurely, often sending metal debris throughout the system. When the compressor fails, the entire A/C system typically needs to be flushed and the condenser, drier, and expansion valve replaced along with the compressor to prevent repeat failure. Repairs typically run $1,200-$2,500. Severity: medium.
What is the 2010-2024 Toyota 4Runner Front Door Lock Actuator Failure (Integrated Latch) Causing Doors to Not Lock/Unlock?
On 5th-gen 4Runners the door lock actuator is built into the door latch assembly and fails frequently, often just outside the factory warranty. Owners find one or more doors that no longer lock or unlock with the key fob or interior switch, sometimes with a rapid clicking from in… Repairs typically run $90-$350. Severity: medium.
What is the 2010-2022 Toyota 4Runner Starter Corrosion / Contact Wear Causing Intermittent No-Crank and Stalling?
The starter on 2010-2022 4Runners is prone to corrosion, and if corrosion migrates into the starter relay/solenoid contacts it can cause intermittent no-crank (a single click or nothing on key turn) and, in some cases, additional driveability gremlins. Because the starter sits lo… Repairs typically run $150-$500. Severity: medium.
What is the 2003-2024 Toyota 4Runner Serpentine Belt Tensioner / Idler Pulley Bearing Failure Causing Squeal and Belt Wear?
The accessory-drive belt tensioner and idler pulley bearings (a 6203-size sealed bearing) wear out and get noisy on the 1GR-FE, producing a persistent squeal/squeak/grinding from the front of the engine that is often mistaken for the water pump or a glazed belt. A weak tensioner… Repairs typically run $40-$350. Severity: medium.
What is the 2003-2024 Toyota 4Runner High-Mileage Harsh / Jerky Automatic Shifting from Valve-Body Pressure Issues?
On higher-mileage 4Runner automatics owners report harsh/abrupt shifts, jerky 3-2 downshifts, unstable RPM blips while coasting near 40 mph, and delayed engagement. The most common mechanical cause is valve-body pressure control wear - a sticking pressure-regulator or throttle va… Repairs typically run $150-$1,500. Severity: medium.
What is the 2003-2024 Toyota 4Runner Rear Hatch (Back Glass) Power Window Regulator/Motor Failure Won't Roll Up or Down?
The signature rear tailgate power glass on the 4Runner is a high-failure, high-search item. The window stops rolling up or down, rolls part way and falls back, moves slowly/unevenly, or makes grinding noises. Root causes are a worn rear window regulator/motor sub-assembly, a fail… Repairs typically run $120-$500. Severity: medium.
What is the 2010-2023 Toyota 4Runner Steering Rack Clunk / Intermediate Shaft Noise?
A clunk or pop may be heard from the steering column area when turning the wheel, especially at low speeds or when going from left to right. The issue is typically the intermediate steering shaft or worn rack bushings. Common on vehicles driven off-road. Repairs typically run $50-$1,500. Severity: low.
What is the 2003-2024 Toyota 4Runner Air-Mix / Blend Door Servo Actuator Failure (Clicking Behind Dash, No Temperature Control)?
The HVAC air-mix (blend) door servo actuators use plastic internal gears that strip over time. When a gear tooth breaks the servo loses calibration and produces a repetitive clicking/ticking sound behind the glove box or center dash, and the climate system can no longer regulate… Repairs typically run $60-$350. Severity: low.
What is the 2003-2024 Toyota 4Runner Clogged Sunroof/Moonroof Drain Tubes Causing Headliner and Floor Water Leaks?
The sunroof tray has plastic drain tubes at each corner that route water down the A-pillars (front) and into the rear pillars, exiting near the rockers. Leaves and debris clog these tubes, so water backs up in the tray and overflows into the headliner, down the A-pillar, and onto… Repairs typically run $0-$200. Severity: low.
