2021 VOLVO V90 B4 (D4 mild hybrid diesel)/B5 (D5 mild hybrid diesel) (P2 platform)
P2 platform / Estate (wagon) / Global (Europe, North America, Asia, Australia)
B4 (D4 mild hybrid diesel)B5 (D5 mild hybrid diesel)B5 (T5 petrol mild hybrid)B6 (T6 petrol mild hybrid)T8 (T8 Twin Engine plug-in hybrid)Exact year/trim recordGold
Engine identity
Oils and fluids
Service and parts data
Common and chronic problems
- High-pressure fuel pump wear (diesel B4/B5)
- Battery aging on mild hybrids
- Timing chain rattle (early production engines)
First checks
- Verify mild hybrid battery condition
- Inspect turbocharger function
- Examine timing chain tension and noise
Before replacing parts
- Save fault codes and freeze-frame data before clearing anything.
- Check engine oil, coolant and transmission fluid using the correct temperature and service procedure.
- Verify power, ground, connectors, hoses, leaks and live data before replacing expensive parts.
Important notes
- Engine availability varies with market emissions and fuel regulations.
- The T8 uses an electric motor integrated with an 8-speed automatic and a lithium-ion battery, enabling ~50 km EV range.
- Oil capacity depends on specific engine and filter used; dealer service recommended for accurate fill.
- No manual transmission offered in 2021 globally for the V90.