Could it be ESP sending torque reduction request to ECU as this seems to happen on hills and turns maybe roll, yaw or acceleration sensors inside ESP unit are not reading quite right always. poor connection, dry solder joint maybe.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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