The 2021 S60 is built on Volvo's SPA platform with 2.0L four-cylinder engines (T5 turbo, T6 turbo+supercharger, T8 plug-in hybrid). Generally solid, but watch for engine failures on T6/T8 variants and transmission cooler leaks that can destroy the 8-speed automatic.
Catastrophic Engine Failure (T6/T8 Piston/Bearing Damage)
Occasional · high severityTypical onset: 40,000-80,000 mi
Symptoms: Sudden loss of power or metallic knocking from engine, Check engine light with cylinder misfire codes, Oil consumption that wasn't there before, Metal shavings in oil filter during routine changes
Fix: Complete engine rebuild or short block replacement. This involves 25-35 labor hours for engine removal, disassembly, machining, and reinstallation. Some cases require new pistons, bearings, and crankshaft work. Root cause appears related to carbon buildup and direct-injection fueling issues causing detonation.
Estimated cost: $12,000-18,000
Transmission Oil Cooler Leak into Coolant System
Common · high severityTypical onset: 50,000-90,000 mi
Symptoms: Pink or milky transmission fluid, Coolant loss without visible external leaks, Harsh shifting or slipping after cooler failure begins, Overheating transmission warning messages
Fix: The Aisin 8-speed's internal oil cooler fails, allowing coolant and ATF to mix. Requires transmission fluid flush, cooler replacement, and often complete transmission rebuild if contamination has circulated. 8-12 hours labor for cooler only, 18-25 hours if transmission needs internal work.
Estimated cost: $2,500-7,500
Transmission Mount Failure
Common · medium severityTypical onset: 60,000-100,000 mi
Symptoms: Clunking when shifting from Park to Drive or Reverse, Vibration at idle that disappears when in Neutral, Excessive engine movement visible under hood during acceleration, Rough engagement during shifts under load
Fix: The upper torque mount and transmission mount wear prematurely. Replacement requires lifting the engine slightly and unbolting old mounts. 2-3 hours labor for both mounts. OEM mounts are recommended over aftermarket.
Estimated cost: $600-1,000
Fuel Filter/Fuel System Contamination
Occasional · medium severitySymptoms: Rough idle or hesitation during acceleration, Check engine light with fuel trim codes (P0171/P0174), Hard starting, especially when cold, Loss of power at highway speeds
Fix: In-tank fuel filter clogs prematurely, sometimes from poor fuel quality or tank contamination. Access requires dropping the fuel tank. 3-4 hours labor. Some cases require fuel pump replacement if debris damaged the pump.
Estimated cost: $800-1,400
Front Seatbelt Retractor Failure (Recall 21V-372)
Occasional · high severitySymptoms: Seatbelt won't retract fully or gets stuck, Seatbelt warning light illuminated with belt fastened, Loose seatbelt webbing that doesn't tighten properly
Fix: Covered under recall but not all owners have had it completed. Retractor mechanism fails, compromising safety. Dealer replacement takes 1-2 hours per side. If out of recall window, aftermarket repair is difficult—OEM parts only.
Estimated cost: $0 (recall) or $600-900 per side
Infotainment Software Glitches (Sensus)
Common · low severitySymptoms: Screen freezes or goes black randomly, Backup camera fails to display, Bluetooth drops connections repeatedly, System reboots while driving
Fix: Software bugs in Sensus system. Usually resolved with software updates at dealer (covered under recall 21V-469 for some units). 0.5-1 hour labor for reflash. Persistent cases may need display unit replacement.
Estimated cost: $0-150 (software) or $1,500-2,200 (hardware)
Buy a 2021 T5 (base turbo) with service records and avoid T6/T8 unless you have a warranty—engine failures are too expensive and common on forced-induction variants.
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.