Volvo XC90 T8 Twin Engine PHEV Engine Replacement Compare Prices & Get Quotes

A Volvo XC90 T8 engine replacement typically costs £5,500-£9,500 for a rebuilt unit supply-only, with fitted prices ranging from £7,000-£12,000 depending on labour rates and ERAD condition. The B4204T35 is the most common T8 engine in UK XC90s.

• Used engines: £2,200-£5,500
• Reconditioned: £4,200-£9,000
• Rebuilt with warranty: £5,500-£12,000
• Fitting labour: 12-18 hours at £65-£100/hr
• ERAD replacement adds £4,500-£6,500 if required

ERAD (Electric Rear Axle Drive) is the electric motor on the rear axle of the XC90 T8 - a known weak point of the car. Symptoms include intermittent electric motor engagement, loss of all-wheel drive, warning messages like "Reduced performance" and "Hybrid system failure".

• Clutch pack repair: £1,700-£2,500
• Complete ERAD replacement: £4,500-£9,500
• Volvo may assist on a case-by-case basis for cars with full service history

It depends on the vehicle's value and what has failed. For a 2017-2021 XC90 T8 worth £14,000-£45,000, a £5,500-£9,500 rebuilt engine is usually worthwhile if the car is otherwise sound. However, ERAD failure is more common than engine failure - if the ERAD has failed, replacing just the ERAD unit (£4,500-£6,500) is usually the better option.

• Cars worth £25,000+: rebuilt engine with warranty is recommended
• Cars worth £15,000-£25,000: evaluate both options
• ERAD failure: repair or replace ERAD, not the engine
• Early cars (2015-2017): avoid unless ERAD has been replaced

Common signs include loss of power (supercharger failure), cold-start rattle (timing chain issues), "Reduced engine performance" warnings, and excessive oil consumption. For ERAD issues specifically, look for intermittent electric motor engagement, loss of rear-wheel drive, and hybrid system warnings.

• Loss of low-end power: supercharger clutch issue
• Rattling on cold start: timing chain tensioner wear
• Warning messages: hybrid system or reduced performance
• Oil consumption: piston ring wear on higher-mileage units

The petrol engine itself is reasonably reliable, but the T8's hybrid systems - particularly the ERAD unit - have a poor reliability record. Early cars (2015-2017) are the most affected, with Volvo making ERAD improvements from 2018. The facelifted cars from 2020 on (badged "Recharge") are considered a relatively safe bet.

• ERAD is the primary reliability concern
• Supercharger clutch and seal failure are also common
• The 2.0-litre Drive-E petrol engine itself is generally robust
• Extended warranty is highly recommended for T8 ownership

The T8 is a plug-in hybrid with a 2.0-litre twin-charged petrol engine and an electric rear motor, producing 303-335 hp from the petrol engine plus 87 hp from the electric motor. The D5/B5 are diesel mild-hybrids with no plug-in capability. The D5/B5 cars are a better bet in terms of dependability, but come with higher running costs and motor tax.

• T8: PHEV, 303-335 hp petrol + 87 hp electric, up to 32-mile electric range
• D5/B5: Diesel mild-hybrid, no plug-in, lower complexity
• T8: Higher performance, lower running costs if regularly charged
• D5/B5: More dependable, simpler systems