richard_wolf1
XC90 Hybrid power loss and stalling
Summary of the thread
A 2021 Volvo XC90 hybrid is experiencing power loss, stalling at idle, and poor gas mileage, accompanied by a check engine light and unusual whistling and hissing noises. These symptoms suggest a potential issue with the boost pressure, possibly due to a leak in the intercooler pipes or a defective wastegate valve. The recommended solution is to inspect the intercooler pipes for leaks and have the wastegate valve checked and repaired if necessary.
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4 comment(s)
richard_wolf1 (community.author)
A whooshing sound, yeah, kinda like that. Intercooler pipes, huh? Where exactly are those located? And would that really cause all these problems – stalling and everything?
richardblitz66
The intercooler pipes run from the turbo to the intercooler and then to the engine. If one of those pipes has a leak, you'll lose boost pressure, which explains the power loss, whistling, and hissing. Stalling could be related if the engine's not getting the right air/fuel mixture. I ended up taking mine to a shop; turned out the wastegate valve was defective. Cost me around 860€ to get it fixed.
richard_wolf1 (community.author)
Wastegate valve... got it! Thanks a bunch for the insight! I'll get it checked out ASAP. Just got the car back from the workshop, wastegate valve was the problem. Exactly 860€, just like you said! Thanks again!
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VOLVO
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XC90
richardblitz66
Sounds familiar! I've got an XC90 too, though not a hybrid. Had something similar happen a while back. Check engine, power loss, the works. Did you happen to notice any difference in how it sounds when accelerating, like a whooshing sound? Have you checked the intercooler pipes for any cracks or loose connections?