The 2000 S80 was Volvo's flagship sedan debut with ambitious engineering that proved problematic long-term. Transmission failures and electrical gremlins plague these cars, with the 2.9L I6 having notable engine durability issues.
GM 4T65-E Automatic Transmission Failure
Common · high severityTypical onset: 80,000-140,000 mi
Symptoms: Harsh shifting or slipping between gears, especially 2nd-3rd, Delayed engagement when shifting into drive or reverse, Whining or grinding noise from transmission, Check engine light with transmission-related codes
Fix: This GM-sourced transmission is the Achilles heel. Internal clutch pack failure is typical. Rebuild requires 12-16 hours labor; many shops recommend replacement with remanufactured unit due to core design weaknesses. Transmission oil cooler often fails simultaneously and contaminates fluid.
Estimated cost: $3,200-5,500
2.9L I6 Engine Internal Failure (Piston/Bearing)
Occasional · high severityTypical onset: 120,000-180,000 mi
Symptoms: Metallic knocking or ticking from engine block, Loss of oil pressure at idle, Excessive oil consumption (more than 1 qt per 1,000 mi), Metal shavings in oil during changes
Fix: The 2.9L inline-six suffers piston ring land failure and rod bearing wear, especially if oil changes were extended. Repair requires complete engine teardown (25-35 hours) for piston/ring/bearing replacement, or short block swap (18-24 hours). Many opt for used engine replacement as more economical.
Estimated cost: $4,500-7,500
Upper Control Arm Ball Joint Failure
Common · high severityTypical onset: 70,000-120,000 mi
Symptoms: Clunking noise over bumps from front end, Wandering or loose steering feel, Uneven tire wear on inside edge, Visible play when prying on ball joint
Fix: Front upper ball joints wear prematurely and can separate catastrophically (subject of recall). Ball joint is not serviceable separately; requires entire control arm replacement both sides. 3-4 hours labor per side, alignment required. Replace both sides preventively.
Estimated cost: $800-1,200
Central Electronic Module (CEM) Failure
Common · medium severitySymptoms: Intermittent or total loss of power windows, locks, or wipers, Gauges reading incorrectly or going dark, Interior lights staying on and draining battery, Random warning messages on dash, No-start condition with good battery and starter
Fix: The CEM controls most electrical functions and develops cold solder joints or capacitor failures. Located under dashboard, requires 2-3 hours to remove and reinstall. Many owners send to specialists for board-level repair ($300-500) rather than buying new module. Programming required after replacement.
Estimated cost: $800-1,800
Turbocharged 2.5L PCV System Clogging (Low Pressure Turbo models)
Common · medium severityTypical onset: 60,000-100,000 mi
Symptoms: Oil consumption and blue smoke on acceleration, Oil leaks from valve cover gasket and front/rear main seals, Rough idle with occasional stalling, Dipstick popping out or blown valve cover gasket
Fix: PCV system traps become clogged with sludge, causing crankcase pressure buildup that blows out seals. Complete PCV system overhaul includes trap replacement, breather box cleaning, and all associated hoses (4-6 hours). Often done with timing belt service. Preventive cleaning every 60k miles critical.
Estimated cost: $600-1,000
ETM (Electronic Throttle Module) Failure
Occasional · high severityTypical onset: 90,000-150,000 mi
Symptoms: Sudden loss of throttle response while driving (limp mode), Illuminated check engine light with throttle body codes, Idle surging or stalling at stops, Car will only rev to 2,000-3,000 RPM maximum
Fix: The drive-by-wire throttle module develops internal circuit board failures. Replacement requires programming to car's VIN (2-3 hours total). Cleaning throttle body sometimes provides temporary relief. No rebuild options; must replace with new or quality remanufactured unit.
Estimated cost: $800-1,400
Front Strut Mount Bearing Failure
Common · low severityTypical onset: 60,000-100,000 mi
Symptoms: Clunking noise when turning steering wheel at low speed, Steering feels notchy or sticky when parking, Visible rust staining on strut tower from water intrusion
Fix: Upper strut mount bearings corrode and seize, particularly in salt-belt states. Replace both sides with mounts and bearings (3-4 hours total). Good time to do struts if original. Alignment required after.
Estimated cost: $500-800
Pass unless you're getting it cheap and can wrench yourself - these are money pits after 100k with transmission and electrical issues that exceed the car's value.
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.