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Old 04-30-2013, 05:33 PM   #1
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Join Date: Apr 2013
Posts: 3
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.
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Old 04-30-2013, 06:00 PM   #2
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Join Date: Jul 2010
Posts: 3
The reduced power light and check engine light usually comes on when there is a failure in the electronic throttle body assem and may be the pedal assem it has sensor on it to. Basicly the pedal assem position sensor tell the throttle actuater module how far to open the throttle blade. I suspect the throttle body assem is at fault. I work at a GM dealer and we see this allthe time. There will be codes you might have to check when it is active or a short time after. The codes stay in memory for quite some time though. If I had a code I could help more.
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