# '04 Chevy Colorado Inline 5 Troubles **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** colorado\ **Created:** [December 17, 2007, 2:34pm UTC](https://community.cartalk.com/t/04-chevy-colorado-inline-5-troubles/8415 "2007-12-17T14:34:53Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![chris\_lajenis](https://avatars.discourse-cdn.com/v4/letter/c/9fc348/32.png) [@chris\_lajenis](https://community.cartalk.com/u/chris_lajenis)\ **Post date:** [December 17, 2007, 2:34pm UTC](https://community.cartalk.com/t/04-chevy-colorado-inline-5-troubles/8415/1 "2007-12-17T14:34:53Z")
What causes check engine light code #P0506 (idle control system, RPM lower than expected) to display? ---
**Author:** ![87\_Ranger](https://avatars.discourse-cdn.com/v4/letter/8/f14d63/32.png) [@87\_Ranger](https://community.cartalk.com/u/87_Ranger)\ **Post date:** [December 17, 2007, 4:31pm UTC](https://community.cartalk.com/t/04-chevy-colorado-inline-5-troubles/8415/2 "2007-12-17T16:31:37Z")
If you had the factory shop manual for your 04 Colorado you could open it up & read something similiar to this. From the factory shop manual for my 02 Hyundai Sonata: Trouble code P0506 “idle control system RPM lower than expected.” Possible Causes: 1. High resistance between injector fuse and IAC/Idle air control valve. 2. High resistance between IAC and ECM/computer. 3. Faulty IAC valve. 4. Carbon fouled throttle plate. If this was my Hyundai, i’d start by cleaning items 3 & 4. You spent thousands on your Colorado, why not spend a few bucks more on the manuals you need to fix it when it breaks??? ---
**Author:** ![Jad2007](https://avatars.discourse-cdn.com/v4/letter/j/dec6dc/32.png) [@Jad2007](https://community.cartalk.com/u/Jad2007)\ **Post date:** [December 17, 2007, 11:10pm UTC](https://community.cartalk.com/t/04-chevy-colorado-inline-5-troubles/8415/3 "2007-12-17T23:10:05Z")
How many people go out and buy factory/shop manuals? Not that they aren’t great, but does it really warrant 6 question marks? Relax.