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Old Nov 13, 2006 | 06:05 PM
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Default "engine reduced power"
I have a stock C5 that starts up any idles really good but when you attempt to drive it displays ENGINE REDUCED POWER/SERVICE TCS" and the car idles really rough and sometimes stalls.Any ideas?The car throws the tps code but it has been replaced.I also changed the battery,cleaned out the grounding points and changed the TAC.My next move is the gas pedal and if that dosn't work then the throttle body.
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Old Nov 13, 2006 | 07:30 PM
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Are you sure you don't have an air leak between the Thottle Body and the MAF?
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Old Nov 13, 2006 | 07:42 PM
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Also check the plug/connector and wires on the MAF and T/B.
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Old Nov 13, 2006 | 08:49 PM
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DIC codes?
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Old Nov 14, 2006 | 04:18 PM
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No air leaks,the wiring harness was one of the first things that was checked pryior to buying any parts.Can't remember exactly which codes it was throwing but after looking them up one was for the TPS and the other was for the TCS inhibited by the PCM due to TPS.Thanks.
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Old Nov 14, 2006 | 04:41 PM
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The answer lies in the codes. This site and the codes will heal you!

http://www.gearchatter.com/index.php
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Old Nov 14, 2006 | 06:55 PM
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Check harness at back of engine on left side at bracket some times wires get rubbed and short out on the bracket ran into this many times
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Old Nov 14, 2006 | 11:14 PM
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Originally Posted by vcarr
I have a stock C5 that starts up any idles really good but when you attempt to drive it displays ENGINE REDUCED POWER/SERVICE TCS" and the car idles really rough and sometimes stalls.Any ideas?The car throws the tps code but it has been replaced.I also changed the battery,cleaned out the grounding points and changed the TAC.My next move is the gas pedal and if that dosn't work then the throttle body.
Had the same exact issue - replaced the gas pedal [thanks Gene at Karshop] and no problem since.
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Old Nov 15, 2006 | 06:23 PM
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Replaced tha gas pedal and it worked fine for about 3 miles then back to square one. I guess I should just bite the bullet and replace the throttle body.
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Old Nov 16, 2006 | 07:13 PM
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Well the last resort did it.Changed the throttle body and that took care of the problem.Thanks for the input and suggestions.
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