This fault points that there is high temperature detected inside the DDE(diesel engine computer) in the circuit that controls the throttle valve.There are couple of things that can cause this issue.It could be your bad throttle valve that is putting strain on the DDE and its raising the temperature or bad wiring.Or E-box fan is not cooling the DDE properly.And it could be more serious issue with DDE itself according to the rheingold(bmw diagnostic software).
Screenshot attached.
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