Reduced Engine Power
I recently purchased a 2004 Itasca Sunrise with the 8.1 Vortec/Allison powertrain. I got the coach home (three hour tour) and tried to back the coach up my driveway and it droppeed pwer and read "Reduced Eng. Power" on the dash readout and the engine light came on. I turned off the engine and restarted and tried again with the same result several times. Over the next week or so I experimented and found that I didn't need a grade to make this condition happen, just had to accelerate in reverse and the coach will drop power and read "Reduced Engine Power". Gravel or pavement, grade or flat, no difference. I had it to a local truck repair facility where he checked both engine and Allison code storage on the OBD and there were no fault codes stored. Can anyone help. Thanks.