2017 TOYOTA SIENNA

Typical onset: 80,000-150,000 mi

Symptoms: Burning more than 1 quart per 1,000 miles, Blue smoke on cold start or acceleration, Check engine light with P0300-series misfire codes, Fouled spark plugs requiring frequent replacement, Eventually total engine failure if oil runs critically low

Fix: Requires complete engine disassembly to replace piston rings and hone cylinders, or short-block swap if cylinder wear is excessive. This is the TSB-documented defect (Toyota TSB 0094-11) affecting 2GR engines built 2006-2015, and 2017s still catch the tail end. Full rebuild runs 20-30 labor hours; short-block swap 18-24 hours.

Estimated cost: $4,500-7,500

Symptoms: Visible rust or green corrosion on steel cooler lines near radiator, Transmission fluid leaking onto subframe, In severe cases: spongy brake pedal if ATF contaminates brake system (rare but catastrophic), May present with no symptoms until line ruptures

Fix: Replace both transmission cooler lines preventively. Toyota issued NHTSA recall 23V-690 and prior campaigns for this exact issue—steel lines corrode in salt states and can leak ATF into brake hydraulics via a faulty union. Check recall status first; if eligible, dealer does it free. If not covered, 2-3 hours labor for cooler lines alone. If brake system contaminated, full flush of master cylinder, ABS module, all calipers required—add 6-8 hours.

Estimated cost: $400-800 (cooler lines only); $2,000-3,500 (if brake system contaminated)

Typical onset: 90,000-130,000 mi

Symptoms: Coolant weeping from pump weep hole, Squealing or grinding noise from front of engine, Overheating or high coolant temp gauge, Coolant puddle under vehicle after sitting

Fix: The 2GR water pump is timing-belt-driven (yes, this V6 still uses a belt in 2017). Pump typically lasts 100k but can fail earlier. Since it's behind the timing cover, budget 5-6 hours labor to access. Always replace timing belt, tensioner, and all idler pulleys during this job even if they look OK—you're already in there. Thermostat and drive belts while you're at it.

Estimated cost: $800-1,400

Typical onset: 70,000-110,000 mi

Symptoms: Clunk or thud when shifting from Park to Drive/Reverse, Excessive engine movement visible when accelerating hard, Vibration at idle that smooths out at higher RPM, Steering wheel shudder during takeoff

Fix: The hydraulic front mount (engine side, near radiator) wears out from the weight of the transverse V6 and AWD components if equipped. Inspect all three mounts; often the front is worst. Replacement is straightforward—support engine from above, unbolt old mount, bolt in new. 1.5-2 hours labor.

Estimated cost: $250-450

Typical onset: 100,000+ mi

Symptoms: Power sliding door opens partway then stops or reverses, Grinding or clicking noise during door operation, Door won't latch fully; dash warning light illuminated, Manual override still works but power function fails

Fix: The cable-and-pulley system for power doors fatigues over time, especially with heavy use (minivan life). Rollers in the lower track also wear. Diagnosis requires door panel removal to inspect cables, pulleys, and rollers. If just rollers, 2 hours; if cable assembly, 3-4 hours per side. OEM parts mandatory—aftermarket rollers fail quickly.

Estimated cost: $400-900 per door

Typical onset: 120,000+ mi

Symptoms: Hard brake pedal requiring significant foot pressure, Check engine light with P0402 or P040F vacuum-related codes, Hissing sound from engine bay when braking, Brakes still functional but require much more effort

Fix: The 2GR doesn't generate much manifold vacuum at idle, so Toyota added an electric vacuum pump for the brake booster. When it fails (diaphragm tears or motor quits), you lose power assist. There's a recall (23V-053) for some build dates; check VIN eligibility first. Pump is behind the engine on firewall side—tight access. 2-3 hours labor if you've done it before; 4 if you haven't.

Estimated cost: $600-1,200