# Reduced engine power

**URL:** <https://community.cartalk.com/t/reduced-engine-power/40672>\
**Category:** Maintenance/Repairs\
**Tags:** engines, lights\
**Created:** [December 12, 2009, 5:57pm UTC](https://community.cartalk.com/t/reduced-engine-power/40672 "2009-12-12T17:57:03Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Helmby](https://avatars.discourse-cdn.com/v4/letter/h/c77e96/32.png) [@Helmby](https://community.cartalk.com/u/Helmby)\
**Post date:** [December 12, 2009, 5:57pm UTC](https://community.cartalk.com/t/reduced-engine-power/40672/1 "2009-12-12T17:57:03Z")

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How can I isolate the problem causing my reduced engine power light to turn on, thus forcing my truck to idle? 2004 GMC Envoy LT V8

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**Author:** ![edb1961](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/edb1961/32/122_2.png) [@edb1961](https://community.cartalk.com/u/edb1961)\
**Post date:** [December 12, 2009, 6:13pm UTC](https://community.cartalk.com/t/reduced-engine-power/40672/2 "2009-12-12T18:13:21Z")

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There’s a lot of discussion about this on a GMC Envoy forum. Here’s a link to one of the threads to get started.

[http://forums.trailvoy.com/showthread.php?t=29732](http://forums.trailvoy.com/showthread.php?t=29732)

Ed B.