Volvo S90 faults

Volvo S90 faults

Infotainment System (Sensus) Failures

Symptoms:

• Touchscreen freezing, lagging, or rebooting randomly.

• Bluetooth or Apple CarPlay/Android Auto disconnects unexpectedly.

• Navigation map errors or blank screens.

Cause:
The Sensus Connect system relies heavily on software updates. Early firmware versions (2016–2018) were prone to glitches due to memory management issues and touchscreen calibration errors.

Solution:

• Update the Sensus software at a Volvo dealer (usually free under service campaigns).

• Perform a system reset if minor issues occur.

• Avoid running too many background apps through connected smartphones.

Air Suspension / Adaptive Dampers Issues

Symptoms:

• Uneven ride height, especially after parking overnight.

• “Suspension service required” warning on the dashboard.

• Clunking or hissing noise over bumps.

Cause:
The air suspension system uses electronic valves and rubber air struts that can leak or malfunction over time. In colder climates, moisture buildup can freeze the valves.

Solution:

• Check for leaks using a soap-water test.

• Replace leaking air struts or compressor.

• Keep drainage areas clean and dry to avoid moisture buildup.

Estimated Repair Cost:
$800–$2,500 depending on component and labor rates.

Electrical System / Sensor Faults

Symptoms:

• Random dashboard warning lights (ABS, ESC, or Lane Assist).

• Malfunctioning parking sensors or blind spot warning.

• Keyless entry not responding.

Cause:
Moisture intrusion into sensors, wiring harness corrosion, or software synchronization issues between control modules.

Solution:

• Check for water ingress near sensor housings (especially in mirrors and bumpers).

• Update the vehicle’s control module software.

• Replace faulty sensors after diagnosis with VIDA (Volvo’s diagnostic tool).

Brake System Wear and Noise

Symptoms:

• Premature brake pad and disc wear (especially on D5 and T8 models).

• Squealing noises when braking lightly.

• Slight vibration through the steering wheel during braking.

Cause:
The S90’s heavy body and regenerative braking system (on hybrids) cause uneven brake wear. Volvo OE pads also generate more dust and noise.

Solution:

• Replace pads and discs with high-quality aftermarket or genuine Volvo components.

• Clean caliper sliders and lubricate appropriately.

• Consider ceramic brake pads for reduced dust and noise.

Hybrid Battery and Charging Problems (T8 Plug-in Hybrid)

Symptoms:

• Reduced electric-only range (below 20 km).

• Charging port not locking or recognizing the cable.

• Warning message: “Hybrid system performance reduced.”

Cause:
Degradation of the lithium-ion battery over time or software imbalance in battery modules. The charging system can also suffer from worn connectors.

Solution:

• Have the battery health checked by a Volvo-certified technician.

• Recalibrate the hybrid system via VIDA diagnostics.

• Replace faulty charging port actuators if necessary.

Note: Battery replacement is rare but expensive (around $5,000–$9,000).

Transmission (Geartronic) Hesitation or Jerky Shifts

Symptoms:

• Delayed gear changes or rough shifting at low speeds.

• “Transmission service required” warning light.

• Lurching when coming to a stop.

Cause:
Dirty transmission fluid, outdated software, or worn valve bodies in the 8-speed Aisin gearbox.

Solution:

• Perform a transmission fluid flush every 60,000–80,000 km (even though Volvo claims it’s “lifetime”).

• Update the transmission control module software.

• Replace valve body if symptoms persist.

Diesel Engine (D4/D5) EGR and DPF Issues

Symptoms:

• Loss of power or limp mode.

• Excessive smoke from the exhaust.

• “Engine system service required” message.

Cause:
Carbon buildup in the EGR valve or a clogged diesel particulate filter (DPF).

Solution:

• Clean or replace the EGR valve.

• Perform a forced DPF regeneration.

• Use premium diesel and ensure regular long drives to allow full regeneration.

Water Leaks in Cabin

Symptoms:

• Damp carpets, foggy windows, or musty smell.

• Water pooling under seats or in the trunk.

Cause:
Blocked sunroof drains or poor sealing around door membranes.

Solution:

• Clean all four sunroof drain tubes using compressed air.

• Inspect door seals and replace any damaged rubber sections.

• Check cabin filter housing for proper sealing.

Door Handle / Lock Actuator Failure

Symptoms:

• Door doesn’t unlock or open from the outside.

• “Key not found” warning even when key is near.

Cause:
Worn-out micro-switches in the door handle or failing electronic actuator.

Solution:

• Replace the affected door actuator (common on driver’s side).

• Ensure the software recognizes the keyless entry module correctly.

Exhaust System Vibration or Rattle

Symptoms:

• Metallic rattle at startup or idle.

• Rattling noise when accelerating lightly.

Cause:
Heat shield corrosion or loose exhaust bracket behind the catalytic converter.

Solution:

• Tighten or replace loose brackets.

• Replace rusted heat shields.

Summary

Volvo S90 as a used car

The Volvo S90 represents the pinnacle of Scandinavian design and engineering in the luxury sedan segment. Introduced in 2016 to replace the aging S80, this model was Volvo’s flagship sedan, competing directly with the BMW 5 Series, Audi A6, and Mercedes-Benz E-Class. As a used car, the S90 offers an impressive combination of understated elegance, advanced safety systems, and powerful yet efficient engine options. It’s particularly attractive for buyers seeking a premium executive saloon that prioritizes comfort, refinement, and safety over outright sportiness.

Engine Options and Performance

The Volvo S90 came with a range of powertrains that reflected Volvo’s move toward smaller, more efficient engines. All engines in the lineup are 2.0-liter four-cylinder units but differ in their configurations:

• T4 and T5: Turbocharged petrol engines producing between 190 and 250 horsepower, delivering smooth performance for daily driving.

• T6: A supercharged and turbocharged petrol engine producing up to 316 horsepower, offering brisk acceleration and strong mid-range torque.

• D4 and D5: Diesel engines providing 190 hp and 235 hp respectively, ideal for long-distance driving with impressive fuel economy (averaging 5.0–5.5 L/100 km).

• T8 Twin Engine Plug-in Hybrid: Combines a turbocharged/supercharged petrol engine with an electric motor for a combined output of around 400 hp. This version can travel roughly 30–45 km on electric power alone, depending on the model year and driving conditions.

All models are equipped with an eight-speed Geartronic automatic transmission. Front-wheel drive is standard on lower trims, while all-wheel drive (AWD) is available on higher-performance variants like the T6, D5, and T8.

Ride Quality and Driving Experience

The Volvo S90 emphasizes comfort and composure rather than sportiness. It features a long wheelbase and adaptive suspension system (optional on some trims) that smooths out road imperfections exceptionally well. The steering is light and precise, ideal for city and highway driving, though it lacks the sharp feedback found in some German rivals. Noise insulation is excellent, with minimal road and wind noise entering the cabin, even at motorway speeds. The available air suspension system on higher trims adds another layer of refinement, adapting automatically to driving conditions.

Interior Design and Materials

Step inside the Volvo S90, and you’re greeted by one of the most elegant interiors in the segment. The cabin design is minimalist yet luxurious, combining premium materials such as Nappa leather, open-pore wood, and brushed aluminum. The seating comfort is outstanding, featuring Volvo’s signature ergonomic seats that provide excellent lumbar support for long drives. Rear legroom is generous, thanks to the extended wheelbase, making it ideal for executive passengers.

The centerpiece of the dashboard is the Sensus infotainment system, controlled via a large vertical touchscreen. It includes navigation, smartphone integration (Apple CarPlay and Android Auto), and voice control. Earlier versions of Sensus can be a bit slow to respond, but later software updates improved usability.

Safety and Reliability

Volvo has long been synonymous with safety, and the Volvo S90 continues this tradition. Standard safety features include:

• City Safety system with pedestrian, cyclist, and large animal detection

• Pilot Assist semi-autonomous driving system

• Lane Keeping Aid

• Run-off Road Mitigation

• Blind Spot Information System (BLIS)

• Cross Traffic Alert

The S90 earned top scores in Euro NCAP crash tests, thanks to its robust body structure and comprehensive suite of active safety technologies. In terms of reliability, the engines and transmissions have proven generally durable, provided that regular maintenance is carried out. However, prospective buyers should ensure that all software updates and hybrid system checks (for T8 models) have been performed.

Common Issues to Watch For

When buying a used Volvo S90, it’s wise to pay attention to several key areas:

• Infotainment glitches: Early Sensus systems can freeze or reboot unexpectedly.

• Air suspension faults: On cars equipped with adaptive or air suspension, check for uneven ride height or unusual noises.

• Battery condition: For T8 hybrid models, inspect the battery health and confirm the vehicle’s electric range.

• Brake wear: Due to the car’s weight, brake discs and pads may wear faster than expected.

• Electrical components: Ensure all driver-assistance features and sensors are functioning properly.

Running Costs and Maintenance

While not the cheapest vehicle to maintain, the S90’s long service intervals (typically every 20,000 km or annually) help keep costs manageable. Fuel economy is reasonable for its class, with the diesel variants being particularly efficient. Hybrid models can be very economical if frequently charged and used for short commutes. Insurance and parts costs are moderate for a luxury car, especially compared to German competitors.

Market Prices and Value Retention

As of 2025, used Volvo S90 models vary widely in price depending on trim, mileage, and engine type. Early 2017 diesel variants can be found at highly competitive prices, while newer plug-in hybrid T8 versions retain more of their value due to their efficiency and low emissions. Buyers can expect solid long-term reliability and lower depreciation compared to some luxury rivals.

Final Verdict

The Volvo S90 stands out as a sophisticated, comfortable, and safe luxury sedan that offers remarkable value on the used market. It appeals to buyers who appreciate refined design, cutting-edge safety systems, and an effortless driving experience. While it may not deliver the sportiest handling, its comfort, practicality, and advanced technology make it one of the most well-rounded executive cars available today. For those seeking a calm and elegant alternative to German competitors, the Volvo S90 remains a highly compelling choice.