Car: Jag XF 3.0
Join Date: 10th April 2006
Thanked 2,774 Times in 824 Posts
This fault can be caused by a number of things. The turbo is controlled by vacuum from the vacuum pump, and an electric solenoid valve. So it could be an electrical connection, the vacuum, a vacuum hose, the solenoid or the turbo itself.
So it is quite possible that it's a leaky hose, a poor electrical connection, or just a random spurious thing.
Also (not sure if it's applicable here), remapped cars can do this when driven really harshly (or on a rolling road). A quick reset is all that's needed.
If the fault doesn't come back, I wouldn't worry about it.