reduced power

2005 GMC ENVOY
100,000 MILES • 5 CYL • 4WD • AUTOMATIC
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BENJIBENJI
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Hello, I recently got a light with an arrow pointing downward in it and while that popped up, my car decelerated to 5 mph and couldn't go any faster, what is the problem?
Jun 30, 2011 at 7:03 AM
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CARADIODOC
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Your'e vehicle has put its self in "Reduced Power Mode" due to a malfunction in the drive-by-wire system. Basically you don't have a throttle cable, but rather 2 sensors that communicate between them. When there is a failure they go into reduced power mode to keep the car from accelerating. Have it scanned for codes, that will let you know where the issue is
The guide below will explain what I am talking about and may help you figure it out

https://www.2carpros.com/articles/how-a-throttle-body-works
Jun 30, 2011 at 8:08 AM