2018 XC90 T6 Reduced Engine Performance and CEL

ClearTheCode guidance (Volvo · Engine & drivetrain)

Summary: For 2018 XC90 T6 Reduced Engine Performance and CEL, work through these steps on your 2016+ vehicle:

1. Confirm the symptom — note when it happens (cold start, highway, after fuel fill, etc.).
2. Scan codes — save all pending/stored DTCs; don't clear until you've recorded them.
3. Check TSBs & recalls — look up your VIN for open campaigns and known fixes.
4. Inspect the obvious — related fuses, connectors, fluid level, and recent repairs.
5. Test the common fix — follow model-specific service procedures; one change at a time.
6. Escalate if needed — burning smell, no brakes, overheating, or stalling in traffic → shop visit.

Owner reported: My 2018 Volvo XC90 T6 Inscription has been acting up lately. The "Reduced Engine Performance" message popped up on the dash, and the check engine light came on. It feels sluggish, especially when accelerating from a stop.

I've noticed a slight hesitation and sometimes it feels like the supercharger isn't engaging properly. The car has about 70,000 miles on it.

Has anyone experienced this with th…

This is educational guidance, not a substitute for hands-on diagnosis.