Volvo XC90, Known Issues and Common Problems
Overview
The XC90 is polarising. The first-generation (2003-2014) carries a reputation that makes even experienced techs wary, not because the platform is fundamentally flawed, but because most examples on the market today have cycled through multiple owners who deferred maintenance on a complex, ageing SUV. The second-generation (2015-present) brought substantial improvements, particularly the SPA platform cars from 2019 onwards with updated piston rings. But no XC90 is bulletproof. Electrical gremlins, cooling system failures, and transmission quirks are common threads across both generations. If you’re buying one, budget for repairs. If you already own one, stay on top of the maintenance schedule, these things punish neglect harder than most Volvos.
Engine
Oil Consumption (2010-2018 T5/T6)
What happens: Engine burns oil between changes, sometimes a litre every 1,000-2,000 km. Check engine light may appear with low oil pressure warnings.
Why it happens: Piston rings on early T5/T6 engines allow oil to slip past into the combustion chamber. It’s not a gradual failure, one day you’re fine, the next you’re topping up constantly.
How to fix it: Piston ring replacement is the permanent fix. Volvo updated the rings in 2019, if you’re buying used, 2019+ is the sweet spot. Cost varies wildly; expect £2,000-4,000 depending on labour rates and whether you’re at a dealer.
Severity: Needs attention. Monitor oil levels religiously if you’re running a pre-2019 T5/T6. Ignoring it will grenade the engine.
Banjo Bolt Failure (2004-2005 2.5T)
What happens: Catastrophic engine failure, rod through the block, game over.
Why it happens: Defective PCV banjo bolt (part number 31325709) has an internal pin that can dislodge and get sucked into the engine. The 2002 bolt (8653884) has a fixed orifice and no moving parts, it’s safe. If your bolt has “03-04” or “04-05” stamped on it, replace it immediately.
How to fix it: Swap the banjo bolt for the 2014 improved version (31325709) or retrofit the 2002 fixed-orifice design. Check yours now.
Severity: Urgent. This is a deal-breaker if ignored.
Turbo and Supercharger Issues (T6, T8)
What happens: Loss of power, whistling or grinding noises from the engine bay, excessive oil consumption.
Why it happens: Turbocharger or supercharger bearings wear out, or wastegates stick. T8 plug-in hybrids complicate this further because they don’t use a traditional accessory belt on some variants, the A/C compressor is electrically driven, so diagnosis can be confusing.
How to fix it: Turbo rebuild or replacement. Volvo OEM turbos aren’t cheap, budget £1,500-3,000. Independent specialists can sometimes rebuild for less.
Severity: Needs attention. Reduced power is one thing, but metal shavings from a failed turbo will ruin your engine.
Cooling System
Radiator and Water Pump Failures (All Generations)
What happens: Overheating, coolant leaks, steam from under the bonnet. Temperature gauge spikes or warning lights appear.
Why it happens: Plastic end tanks on radiators crack with age and heat cycling. Water pumps fail due to bearing wear or impeller degradation, especially on high-mileage examples.
How to fix it: Replace the radiator and water pump as a pair. Don’t cheap out with pattern parts, Volvo OEM or quality aftermarket (Mahle, Behr) only. Expect £500-1,200 depending on labour.
Severity: Urgent. Overheating will warp the head or worse.
Heater Core Leaks (First-Gen XC90)
What happens: Sweet smell of coolant inside the cabin, wet carpets on the passenger side, fogged windscreen that won’t clear.
Why it happens: Heater core corrodes or cracks. It’s buried deep in the dash, so replacement is a nightmare job.
How to fix it: Full dash-out job to access the heater core. Not a DIY task unless you’ve got time and patience. Expect 6-8 hours labour at a dealer, plus parts. Total cost can hit £1,500-2,000.
Severity: Needs attention. You can live with it for a while, but the smell gets oppressive and coolant loss will eventually cause overheating.
Fuel System
Fuel Pump Relay Failure (240, applicable principle to XC90 electronics)
What happens: No start, or engine cuts out randomly. Multiple warning lights on the dash.
Why it happens: Corrosion or overheating in the fuel pump relay socket. The relay itself is fine, the connection melts or corrodes.
How to fix it: Replace the relay and its socket with a waterproof-style fuse holder. Cheap fix, takes 20 minutes.
Severity: Minor annoyance when it first acts up, but can leave you stranded.
Fuel Pressure Sensor Issues (T5, T6)
What happens: Rough idle, hesitation under load, check engine light with fuel pressure codes.
Why it happens: Sensor fails or gets contaminated. Not a widespread issue, but common enough to mention.
How to fix it: Replace the fuel pressure sensor. About £100-150 for the part, straightforward swap.
Severity: Minor annoyance. Won’t damage anything, but driveability suffers.
Electrical
High Voltage Coolant Heater Failure (T8 Plug-in Hybrid)
What happens: Loss of cabin heating in EV mode, warning lights, reduced electric range.
Why it happens: The HVCH is a known weak point on T8s. An updated part was released around 2023, if you’ve had it replaced recently, you should be fine. Earlier replacements just swapped in the same faulty design.
How to fix it: Warranty job if you’re under the 8-year/100,000-mile HV warranty (US market). Outside warranty, expect £1,500-2,500 at a dealer. Do not attempt HV repairs yourself, 250V DC will kill you dead.
Severity: Needs attention. Covered under warranty on most T8s, but an expensive fix if you’re out of coverage.
Headlight Moisture and Malfunction (2025 XC90)
What happens: Condensation inside the headlight units, sometimes so much it forms droplets. High beam malfunction warnings, lights that don’t clear even after extended use.
Why it happens: Dodgy seals on brand-new units. This has been reported on 2025 models and suggests a quality control issue.
How to fix it: Warranty replacement of the headlight units. Dealers often dismiss this as “normal condensation”, it’s not. Push back.
Severity: Needs attention. Moisture will corrode the electronics and lead to full headlight failure.
Infotainment and Electrical Gremlins (All Generations)
What happens: Unresponsive touchscreen, seat adjustments that stop working, random interior light behaviour, parking brake that refuses to engage.
Why it happens: Software bugs, failing control modules, or corroded connectors. The SPA platform cars (2015+) lean heavily on software, which means gremlins are common.
How to fix it: Software updates can resolve some issues. For hardware failures, expect module replacements, not cheap. Seat control modules, for example, can run £500-800.
Severity: Minor annoyance to needs attention depending on what fails. A parking brake that won’t engage is a safety issue, especially on inclines.
Bulb Integrity Sensor Failure (240, principle applies)
What happens: You lose all your brake lights, or you get a warning light claiming a bulb is out when it’s not.
Why it happens: The sensor monitors voltage to each bulb and fails over time. It’s inline with the circuit, so when it goes, it takes everything with it.
How to fix it: Replace the bulb integrity sensor. Keep spares in the car, these are difficult to find and a pain to diagnose.
Severity: Urgent if it kills your brake lights. Pull over and fix it before someone rear-ends you.
Transmission and Drivetrain
Aisin Transmission Failures (First-Gen XC90 T6 AWD)
What happens: Harsh shifts, slipping gears, clunking noises, or complete failure to engage drive.
Why it happens: The Aisin TF-80SC gearbox in early XC90s is fragile. Inadequate cooling, deferred fluid changes, and towing accelerate wear on clutch packs and valve bodies.
How to fix it: Transmission fluid changes every 50,000 miles are mandatory, Volvo calls it “lifetime fluid,” which is true if you define “lifetime” as the life of the gearbox before it grenades. Use Volvo OEM fluid. Full rebuild or replacement can cost £3,000-6,000.
Severity: Urgent if you’re experiencing symptoms. Preventive fluid changes are cheap insurance.
ERAD Failure (T8 Electric Rear Axle Drive)
What happens: Loss of AWD function, grinding noises from the rear axle, warning lights.
Why it happens: Internal gears in the ERAD unit fail due to heavy loading, hard acceleration, towing, or just bad luck. Changing the ERAD oil every 50,000 miles may help, but it won’t prevent failure outright.
How to fix it: ERAD replacement under warranty (8-year/100,000-mile in US). Out of warranty, expect £5,000-8,000. Do not tow with your T8.
Severity: Needs attention. Covered under warranty for most, but catastrophic if you’re outside coverage.
Differential Oil (All AWD Models)
What happens: Whining or grinding from the front or rear differential, especially on turns.
Why it happens: Differential oil breaks down over time, leading to bearing and gear wear.
How to fix it: Change front and rear diff oil every 50,000 miles. Use Volvo OEM oil, it’s a specific weight and you don’t want to guess. Front diff is harder to access than the rear.
Severity: Minor annoyance early on, but ignoring it leads to expensive differential rebuilds.
Suspension and Steering
Strut and Spring Failures (First-Gen XC90)
What happens: Clunking over bumps, excessive body roll, uneven tyre wear.
Why it happens: Struts and springs wear out, especially on high-mileage examples. Broken strut top hat bearings cause the strut to shift, leading to camber changes and accelerated tyre wear.
How to fix it: Replace struts, springs, and top mounts as a set. Budget £800-1,500 for parts and labour.
Severity: Needs attention. Handling suffers and tyre wear gets expensive.
Steering Rack Leaks (V70, XC70, applicable to XC90)
What happens: Power steering fluid leaks, heavy steering at low speeds, whining noises.
Why it happens: Seals in the steering rack fail over time, especially in older examples.
How to fix it: Rack replacement or rebuild. Expect £600-1,200.
Severity: Needs attention. You can top up fluid for a while, but it’ll eventually fail completely.
Brakes
Warped Rotors and Pad Wear (All Generations)
What happens: Vibrations through the steering wheel or brake pedal when braking, squealing noises.
Why it happens: Heavy SUV + aggressive braking = warped rotors. It’s physics.
How to fix it: Replace rotors and pads as a set. Don’t cheap out, use quality parts (Brembo, ATE, or Volvo OEM). Expect £400-700 per axle.
Severity: Needs attention. Warped rotors won’t stop you, but they’ll make braking less effective and more uncomfortable.
Body and Rust
Sunroof and Windscreen Seal Leaks (2025 XC90)
What happens: Water dripping from the overhead console, wet B and C pillars, active leaks in the D pillars near the boot.
Why it happens: Faulty seals, poor assembly, or design flaws. This has been reported on brand-new 2025 models, which is unacceptable.
How to fix it: Warranty repair. Dealers will attempt standard leak tests and likely blame you or the weather. Push for a thorough inspection and seal replacement.
Severity: Needs attention. Water ingress will corrode electronics and rot interior trim.
General Rust (First-Gen XC90)
What happens: Rust on subframes, suspension mounts, and body seams.
Why it happens: Age, road salt, and deferred maintenance. First-gen XC90s are 15-20 years old now, rust is inevitable in wet climates.
How to fix it: Surface rust can be treated. Structural rust means walk away.
Severity: Needs attention if buying used. Structural rust is a deal-breaker.
Interior
Climate Control Blower Motor Failure (All Generations)
What happens: No airflow from vents, or excessive noise from the blower motor.
Why it happens: Blower motor wears out. It’s a consumable part that eventually fails on every car.
How to fix it: Replace the blower motor, resistor, and switch as a set. It’s buried in the dash, expect 5-6 hours labour. Total cost can hit £600-1,000.
Severity: Minor annoyance in summer, urgent in winter.
Lumbar Support and Seat Adjustment Failures (2025 XC90)
What happens: Lumbar support changes position on its own, all seat controls stop responding.
Why it happens: Software or control module fault.
How to fix it: Restart the infotainment system to temporarily restore control. Permanent fix likely requires a module replacement or software update.
Severity: Minor annoyance until it happens on a long drive, then it’s maddening.
Preventive Maintenance
These are the essentials to keep your XC90 from eating your wallet:
- Engine oil every 5,000 miles, not 10,000. Volvo’s interval assumes ideal conditions, your commute isn’t ideal.
- Transmission fluid every 50,000 miles. Ignore “lifetime fluid” marketing. Use Volvo OEM fluid and have it done by someone who knows the procedure.
- ERAD oil every 50,000 miles (T8 only). It won’t prevent failure, but it’s cheap insurance.
- Differential oil every 50,000 miles (AWD models). Front and rear.
- Timing belt every 10 years/100,000 miles (2000-2015 five- and six-cylinders) or every 10 years/150,000 miles (2015+ four-cylinders).
- Spark plugs every 6 years/60,000 miles. Use Volvo OEM, aftermarket plugs cause misfires.
- Coolant system inspection annually. Check hoses, clamps, radiator end tanks, and water pump for leaks or cracks.
- PCV system maintenance (all engines). Replace the oil separator, flame trap, and breather hoses every 100,000 miles. Neglect this and you’ll blow seals everywhere.
- Check the banjo bolt (2003-2005 2.5T). If it’s not the 2014 updated version, replace it now.
- Inspect headlight seals (2025 models). If you see condensation, document it and push for warranty replacement.
The XC90 is a capable, comfortable SUV, but it demands respect. Maintenance isn’t optional, it’s survival.
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