The 2017 Crosstrek (XV platform) with the FB20 2.0L boxer is generally reliable for a Subaru, but shares common CVT and head gasket tendencies with the broader lineup. Most issues surface after 80k miles with proper maintenance delaying the inevitable.
CVT Transmission Judder and Fluid Breakdown
Common · medium severityTypical onset: 60,000-100,000 mi
Symptoms: Shuddering or hesitation during acceleration from stop, Whining or droning noise under load, Delayed engagement when shifting to Drive or Reverse, Check engine light with CVT temp codes
Fix: CVT fluid and external filter change often masks symptoms temporarily (2-3 hours labor). Full valve body replacement or internal overhaul needed for persistent judder (8-12 hours). Subaru extended warranty to 100k on some units, verify eligibility before paying out of pocket.
Estimated cost: $400-600 for fluid service, $3,500-5,500 for valve body or rebuild
Head Gasket Seepage (FB20 Engine)
Occasional · medium severityTypical onset: 80,000-120,000 mi
Symptoms: Oil weeping from cylinder head seam, visible on block exterior, Coolant smell or slight consumption without visible leaks, White residue around oil cap, No mixing of fluids initially, external seepage comes first
Fix: External seepage can be monitored if minor. Full head gasket job requires engine removal or severe disassembly on these (12-16 hours labor). Resurface heads, replace timing components, water pump, and all seals while apart. This is the classic Subaru tax.
Estimated cost: $2,800-4,200
PCV Valve and Breather System Clogging
Common · low severityTypical onset: 50,000-90,000 mi
Symptoms: Rough idle or stumbling at cold start, Oil consumption increases slightly, Check engine light P0171/P0172 lean/rich codes, Oil in intake tubing or air filter housing
Fix: Replace PCV valve in valve cover and clean intake manifold of oil residue (1.5-2 hours). Subaru redesigned the valve cover assembly for better separation, upgrade recommended. Preventive cleaning every 30k helps FB20 longevity significantly.
Estimated cost: $250-450
Transmission Oil Cooler Line Corrosion
Occasional · high severitySymptoms: Transmission fluid leak near radiator area, Sudden loss of Drive or erratic shifting, Pink or red fluid pooling under front of vehicle, Transmission overheating warnings
Fix: Steel lines rust through at brackets or connections, especially in salt states. Line replacement requires CVT fluid drain and refill (2-3 hours). Catastrophic if CVT runs dry—tow immediately if you see red fluid. Subaru issued TSB but no recall.
Estimated cost: $400-700
Rear Wheel Bearing Noise
Occasional · medium severityTypical onset: 70,000-110,000 mi
Symptoms: Humming or growling from rear that increases with speed, Noise changes pitch in turns, ABS or traction control light occasionally
Fix: Rear hub assemblies are press-fit and tend to fail before fronts on this chassis. Replace as complete assembly with new tone ring (1.5 hours per side). AWD system can bind if ignored too long, causing center diff damage.
Estimated cost: $350-500 per side
Brake Light Switch Failure (Recall 20V-666)
Occasional · medium severitySymptoms: Brake lights stay on with pedal released, Cruise control won't engage or cancels randomly, Push-button start won't recognize brake pedal press, Increased battery drain from lights staying on
Fix: Switch contacts fail, preventing engine start or draining battery overnight. Recall covers replacement (0.5 hour), but verify it was completed. If post-recall, aftermarket switch is $50 and 15 minutes to replace.
Estimated cost: $0 if recall applied, $120-180 otherwise
Timing Chain Tensioner Rattle (Cold Start)
Rare · medium severityTypical onset: 100,000+ mi
Symptoms: Metallic rattling for 2-5 seconds at cold start, Goes away once oil pressure builds, No noise when warm
Fix: FB20 uses chains (not belts) but tensioner check valves can weep down overnight. Replace tensioners, guides, and chains as a kit with valve cover gaskets while you're there (8-10 hours). Failure is rare but catastrophic—bent valves and piston damage.
Estimated cost: $1,800-2,800
Solid daily driver if CVT is maintained and you budget for head gaskets around 100k—avoid high-mileage examples without service records.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.