The way I would approach it is to pull it off and give it a good cleaning - that needs to be done periodically anyway.
If that doesn't cure it, then you start thinking about purchasing another.
Is this on your 2006? If so, then a replacement throttle body is plug-n-play, no programming required.
Personal experience: We were getting repetitive throttle related fault codes on my wife's 2005 S80 2.5T, along with the "Reduced Engine Performance" message. Cleaning it did not cure it. Replacing it didn't cure it either. Removing the ECM and plugging it back in DID cure it.
Now a spare $350 Bosch throttle body is sitting on the shelf looking pretty.
My advice to anyone experiencing chronic throttle faults, that they can't cure with a simple cleaning, would be to check the ECM connection and also consider the condition of the wire harness between ETM and ECM, all before plunking down the $'s for a new ETM. I think the later ones, after about 2003?, are supposed to be pretty robust.
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Current rides: 2005 Volvo S80 2.5T, 2003 Volvo V70 2.4NA, 1973 Volvo 1800ES (getting ever closer to road worthiness)
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