No parking sensors activity while this has happened for me..
I guess it has to be the engine restricting the revs like you say, maybe the car has to reach a certain speed before it lets the revs rise higher ? But then it's back to a gearbox issue, why it doesn't lock the clutches to increase the speed.. And if there is something wrong that tells the engine to reduce torque, why doesn't it throw a code..
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06 A8 3,0TDIq My daily driver and project...
97 A4 1,8Tq. Powered by a 4,2 from the '01 S6, full rollcage, FIA seats and 6-point harnesses, B5 RS4 KW Competition race suspension, B6 S4 brakes, 18" Toyo RS1 slicks, carbon fiber roof. V8 trackday racer 
14 VW Caddy 1,6TDI from my employer..
(X)00 A8 2,8q, (X)97 A4 1,8Tq, (X)92 S4 2,2Tq, (X)92 80 2,3E
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