Toyota · Known Issues
2008 Toyota Sienna Problems: 13 Known Issues
2008 model year · 8,090+ owner reports · Updated September 2026
2008 · All trims · All engines
Choose the year and equipment for your written issues and visual request.
2008 model year · 8,090+ owner reports · Updated September 2026
2008 · All trims · All engines
Choose the year and equipment for your written issues and visual request.
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According to Au7o's analysis of 8,090+ owner reports, the 2008 Toyota Sienna has 13 documented known issues, with 2 rated critical. The most serious are Rear Coil Spring Fracture at Lower Coil from Corrosion ($400-$900 repair) and Spare Tire Carrier Cable Corrosion Causing Spare to Drop (Recalls 10V-160 and 14V-273) ($0-$0 repair). The most commonly reported issue is Power Sliding Door Malfunction with 3,200 owner reports. Across all issues with published estimates, repair costs range from $50 to $3,800. DIY maintenance guides at au7o.io.
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According to Au7o's analysis of 8,090+ owner reports, the 2008 Toyota Sienna has 13 documented issues. The most frequently reported are: Rear Coil Spring Fracture at Lower Coil from Corrosion, Spare Tire Carrier Cable Corrosion Causing Spare to Drop (Recalls 10V-160 and 14V-273), Power Sliding Door Malfunction. Of these, 2 are rated critical and should be addressed promptly.
The 2008 Toyota Sienna has 13 known issues documented across 8,090+ owner reports. 2 issues are rated critical: Rear Coil Spring Fracture at Lower Coil from Corrosion and Spare Tire Carrier Cable Corrosion Causing Spare to Drop (Recalls 10V-160 and 14V-273). Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
Repair costs for known Toyota Sienna issues range from $0 to $3,800, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Rear Coil Spring Fracture at Lower Coil from Corrosion, typically costs $400-$900 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
On second-generation (XL20) Siennas the rear coil springs corrode where the bottom coil sits in the lower spring seat, which traps road salt and moisture. The spring rusts through at that contact point and snaps, usually within the last coil. Independent Toyota shops in the salt… Repairs typically run $400-$900. Severity: high.
The underbody spare tire carrier on second-generation Siennas is exposed to road-salt spray because the water splash protector is inadequate. The steel hoist cable corrodes where it enters the carrier mechanism, and the cable can eventually fail and release the full-size spare ti… Repairs typically run $0-$0. Severity: high.
Power sliding doors on 2nd and 3rd gen Siennas are prone to cable fraying, motor failure, and latch mechanism issues. Doors may refuse to open/close, reverse mid-travel, or make grinding noises. The cable assembly inside the door wears and eventually snaps. Repairs typically run $400-$1,500. Severity: medium.
2nd-gen Sienna dashboards are notorious for cracking, warping, and developing a sticky/melting surface, especially in hot climates. The dashboard material degrades from UV exposure and heat, creating a hazardous glare and releasing a sticky residue. Repairs typically run $0-$2,000. Severity: medium.
The 3.5L 2GR-FE V6 commonly develops oil leaks from the VVT-i oil line, timing cover, and valve cover gaskets. The VVT-i oil hose fitting loosens over time, dripping oil onto the exhaust manifold creating a burning smell and fire risk. Repairs typically run $50-$800. Severity: medium.
The 3.5L 2GR-FE V6 in 2nd and 3rd generation Siennas can consume 1 quart of oil every 2,000-3,000 miles. Worn piston rings and valve stem seals are the primary causes. The issue is more prevalent in vehicles driven primarily in city stop-and-go conditions where the engine rarely… Repairs typically run $200-$3,800. Severity: medium.
The lower sliding-door rail and the seam where the rocker panel meets the sill trap salt, grit and water on Siennas run in the salt belt. Rust starts inside the lower door track and in the rocker seam under the sliding doors, then perforates outward and can eat into the structura… Repairs typically run $300-$2,500. Severity: medium.
Front wheel bearings are a high-frequency wear item on the XL20 Sienna, which carries substantial front axle weight. The failure presents as a droning or humming that rises with road speed and changes character when the van is steered - loading the opposite side quiets a bad bear… Repairs typically run $180-$600. Severity: medium.
XL20 Siennas develop a distinct shudder - felt as a rumble-strip vibration through the floor - under very light throttle at low RPM, typically below about 2,000 RPM while holding speed or climbing a gentle grade. It disappears the moment the transaxle downshifts or RPM rises. The… Repairs typically run $150-$2,200. Severity: medium.
The intermediate shaft that links the steering column to the rack carries a U-joint that rusts and binds on older Siennas, especially in salt states. The result is a stiff, notchy, catchy feel just off center and a clunk or pop from the dash/firewall area on turn-in or over bumps… Repairs typically run $180-$500. Severity: medium.
XL20 all-wheel-drive Siennas were sold with run-flat tires and no spare of any kind, because the rear driveshaft occupies the underfloor space where the FWD van carries its spare. Owners hit three compounding problems: the OE run-flats wore out unusually fast (Toyota ultimately o… Repairs typically run $800-$1,600. Severity: medium.
The hydraulic power steering rack on 2004-2020 Sienna models (non-hybrid, pre-2021) develops internal seal leaks that allow power steering fluid to weep from the rack boots or the input shaft seal. The leak starts slowly but progressively worsens, leading to low fluid level, groa… Repairs typically run $250-$2,000. Severity: medium.
High-mileage XL20 Siennas commonly set P0420 (Bank 1) and sometimes P0430 (Bank 2) for catalyst efficiency below threshold. On this V6 layout Bank 1 is the rear (firewall) bank and Bank 2 the front, and the van carries four sensors: two upstream air/fuel ratio sensors and two dow… Repairs typically run $220-$2,200. Severity: low.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.