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Hello, my name is Joe
The first thing that comes to mind is the throttle actuator system. This system includes the throttle/foot pedal, the Throttle Actuator control module, and the Throttle actuator.
If the engine PCM sees any discrepancy in the signals or data in this system, it will give a "reduced engine power" message - along with a power derate. The engine might even return to idle speed only. This is a built in safety feature to keep the engine from accelerating uncontrollably.
Any time the "reduced power" message is displayed, the ecm will reduce engine power until the condition is corrected.
Possible causes include but are not limited to:
dirty or corroded connections at the throttle, tac control module, or throttle actuatordamaged wiring in the harness between these componentsa glitch or defect in one of these componentsIf you can obtain a code reader, there could be 1 or more stored fault codes that may narrow down the search.If the motorhome had been parked for a period of time, don't rule out the possibility that rodents may have damaged some wiring.The t.a.c. module is usually located under the dash or on or near the steering column, often has a piece of foil tape on the side.The throttle actuator is the device on the engine that opens and closes the throttle plate via an electric motor.
Just checking in to see if you need any clarification on something which I stated above. Please remember to rate my service, so I can receive credit for my help. -Joe