2003 Tahoe 92000 miles no previous check engine lights in past. Last nite light came on and message on instrument panel read "reduced engine power". This morning the message is gone but check engine light is still on. Wasnt sure if the light is just a reminder to change timing belt or have some regular maintenance performed. any ideas?
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www.underhoodservice.com/tech-tip-reduced-engine-power-message-dis... Dec 10, 2012 - Tech Tip: Reduced Engine Power Message Displayed on GM Vehicles ... Model year 2008-'10 vehicles must have the engine control module (ECM) reprogrammed ... Do not drop the electronic throttle control components.
Your Tahoe goes into "Power Reduction Mode" to keep you from continuing to operate the vehicle with an OBVIOUS problem and destroying high-dollar parts like catalytic converters, cylinder heads, etc.. Yeah, the old days of simply ignoring Check Engine lights are over.... The manufacturers have made it so the engine will go into reduced power mode and FORCE you into properly maintaining your vehicle.
(Not saying that you don't maintain your vehicle...Just pointing out that you can thank all of those people that continuously run around with warning lights SCREAMING all over their dash for the wonderful little "Reduced Power Mode" feature.)
As for what could be actually causing thie problem? Well, just let me say that the last time I counted, there were over 600 "generic" OBD fault codes available for most cars (80% of which will turn the Check Engine light on long before reduced power mode takes place), and several hundred more "vehicle specific" fault codes that have not yet made the generic code list.
So, to put it simply, you will have to scan your computer network and gather all the fault codes and perform fault code diagnostics to determine the actual cause of your problem.