Common Volvo XC40 Problems & the Parts That Fix Them

• Oil level drops between services with no visible external leak
• Low-oil-level warning appearing well before the next service
• Blue or grey smoke from the exhaust, especially on acceleration
• Fouled spark plugs needing premature replacement
• Faint oil smell from the engine bay

Affected years: Early XC40 T3/T4/T5 petrol models (approx 2018–2020) using the 2.0-litre B4204 Drive-E four-cylinder engine family.

The XC40's petrol engine is part of Volvo's wider VEA / Drive-E family that has a documented oil-consumption issue: the drain holes in the oil-control piston rings are undersized and clog over time, so oil that should be scraped off the cylinder walls instead burns in the combustion chamber. The Volvo Owners Club UK forum carries owner reports of this across the four-cylinder range, and SwedeSpeed's excessive-oil-consumption thread documents the piston-ring root cause. In some markets Volvo extended the engine warranty to address it — but on a car that has aged out of warranty, the only durable fix is mechanical.

If the car uses more than roughly 0.5 litres per 1,000 km, have a compression and leak-down test done to confirm the rings. A used replacement engine from a low-mileage donor — or a later revised unit — is frequently more cost-effective than an in-situ piston-ring rebuild at dealer labour rates. DIY difficulty: Workshop only — engine disassembly required.

• Centre touchscreen freezes, goes black, or reboots at random
• Reversing camera, climate and audio drop out when the screen hangs
• Apple CarPlay / Android Auto connection drops repeatedly
• Slow start-up — the display takes a long time to wake
• The screen cycling on and off, preventing the car from sleeping

Affected years: Most common on 2018–2020 cars with the first-generation Sensus system; the later Google-based Android Automotive system (roughly 2021 onward) is more stable.

The infotainment head unit runs software that occasionally crashes or fails to enter sleep mode. AUTODOC's XC40 fault guide lists infotainment defects — frozen screens and smartphone-connection problems — as one of the model's most reported issues, particularly on T3/T4 petrol and plug-in hybrid variants. Many cases are cured by an over-the-air or dealer software update; a genuine hardware failure of the display or head unit is rarer but does happen on older cars.

Start with a software update and a hard reset (press and hold the home button below the screen) — this resolves most freezes for free. If the unit has genuinely failed, a used or refurbished display/head unit from a donor car is dramatically cheaper than a new OEM part. DIY difficulty: Easy (reset/update) to Hard (head-unit replacement, needs coding).

• Car won't start after standing for a day or two
• Start-stop function stops working (first sign of a tired AGM battery)
• Battery health reported as "bad / replace" within months of fitting
• Electrical warnings or flickering displays at start-up
• Battery flat again soon after a replacement — points to a parasitic draw

Affected years: All XC40s with start-stop (2018 onward); most acute on the B3/B4/B5 mild-hybrid cars (approx 2020 onward) that lean harder on the 12V system.

AGM batteries in start-stop cars are cycled hard and commonly last only around two years — less on short-trip city use. The XC40 owners' forum battery-drain thread reports the same pattern again and again: a battery degrading from healthy to "replace" in months, sometimes because a control module won't let the car sleep and keeps drawing current overnight. A door or bonnet left ajar will do it too — and as Bumper's XC40 reliability guide notes, minor electrical faults around the infotainment and driver-aid systems are among the model's more common niggles.

Fit the correct AGM battery (a standard flooded battery will trigger faults and won't survive start-stop duty) and have it registered/coded to the car. If a healthy battery keeps dying, get a parasitic-draw test to find the module that won't power down before you keep buying batteries. DIY difficulty: Easy (battery swap) — but coding/registration usually needs a workshop.

• Tailgate stops part-way and won't close fully
• Tailgate creeps open, or the "boot open" warning appears while driving
• Hand-wave / foot-kick sensor opening stops working
• Grinding or straining noise from the tailgate motor
• Gas struts no longer hold the tailgate up

Affected years: XC40s fitted with the optional power tailgate; AUTODOC notes weaknesses developing after roughly 30,000 km.

The power-tailgate mechanism combines an electric strut/spindle drive, a control module and gas struts. Worn or weak struts let the gate sag and confuse the close cycle; a failing spindle motor stalls part-way; and a module fault can make the gate open unintentionally. AUTODOC's fault guide flags the tailgate not closing completely or opening on its own as a known characteristic weakness. Most of the time it's a single strut or motor rather than the whole assembly — get it diagnosed before replacing everything.

Identify the failed component first — a single power strut, the spindle motor, or the control module. Used parts from a donor XC40 are far cheaper than a full new mechanism, and a strut swap is a straightforward job. DIY difficulty: Moderate for a strut; Hard if the spindle motor or module needs replacing and coding.

• Hesitation or a "kick" when pulling away or in stop-start traffic
• Delayed engagement when selecting Drive or Reverse
• Jerky or clunky shifts between the lower gears
• Shudder on light acceleration (often degraded transmission fluid)
• Transmission warning message in more severe cases

Affected years: Petrol and diesel automatics, most reported on early cars (2018–2020) with the Aisin 8-speed torque-converter automatic.

Several reviewers note the early petrol and diesel XC40 automatics can feel clunky at low speed. Volvo's automatic gearboxes are Aisin units, and YouCanic's Volvo transmission guide explains that much of the shudder and hesitation traces back to degraded transmission fluid and adaptive shift learning that hasn't been reset. A lot of low-speed jerkiness is cured by a fluid service plus a software update — the gearbox adapts to your driving and can behave oddly if the adaptation isn't reset after work. Genuine internal failure (valve body or torque converter) is far rarer on these cars.

Start with the cheapest route: a transmission-fluid service and a dealer-level software/adaptation reset. If the problem is mechanical, a quality-tested used gearbox from a low-mileage donor is far cheaper than a dealer rebuild. See our used Volvo gearboxes for availability. DIY difficulty: Moderate (fluid service) to Workshop only (gearbox replacement).

• "Soot filter full" or "exhaust filter full" warning light
• Loss of power and limp-mode activation
• Increased fuel consumption
• Excessive black smoke on acceleration
• Repeat filter-full warnings shortly after a forced regeneration (root-cause fault)

Affected years: XC40 D3 and D4 diesel models (approx 2018–2020, before Volvo phased diesels out of the range).

The diesel particulate filter (DPF) traps soot and burns it off during sustained higher-speed driving. Owners who mostly do short urban trips never get the exhaust hot enough for regeneration to complete, so the filter clogs. ClickMechanic's XC40 problems guide notes that diesel XC40s used mainly for short journeys are prone to DPF blockage, and that EGR valve or cooler faults turn up on a handful of diesel cars. A failing EGR feeds extra soot into the system and blocks the DPF faster — always fix the root cause before replacing the filter, or it will simply block again.

First try 20–30 minutes of sustained highway driving for a passive regeneration. If that fails, a workshop can run a forced regen via diagnostic tool. Before replacing the DPF itself, diagnose and fix the EGR valve, EGR cooler or relevant sensor. DIY difficulty: Workshop only — forced regen needs specialist diagnostic equipment.

• Automatic Emergency Braking that may not engage as intended (2019–2020 cars)
• Connectivity module emergency-location fault on early 2018 cars
• Rear seatback that may not lock upright (some 2018 examples)
• Missing brake-booster securing nut (some Nov 2019–Feb 2020 cars)
• Any open recall flagged when you run the VIN

Affected years: Mostly 2018–2020 build dates; the exact recalls depend on the VIN.

The XC40 has had several safety recalls. The best-known is the Automatic Emergency Braking software/hardware incompatibility on certain 2019–2020 cars, where the system might not detect an obstacle and brake as intended — Volvo dealers updated the Active Safety Domain Master software free of charge. What Car?'s used XC40 reliability review also lists the early connectivity-module emergency-location fault, a rear-seatback recall on some 2018 cars, and a missing brake-booster securing nut on a batch built late 2019 to early 2020. These are corrected free under recall — but only if they've actually been done.

Run the VIN through Volvo to see if any recall is outstanding, and have the work carried out at a franchise dealer at no cost — recall repairs are free regardless of age or mileage. If you're buying a used XC40, make confirmation of completed recalls a condition of sale. DIY difficulty: N/A — dealer recall work only.