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spray some throttle body into the throttle body to clean it out. Do this by taking off the air filter tubes. Start the engine and slowly spray into the throttle body.
Check your wiring and see if there could be something pinching that could break it apart. Even where the wires come through the car body. Also check all connections . Sounds like you have a short.
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.
ECS is electronic controlled stability. It works with traction control when it is slippery and it does cause what you describe. It reduces the power to the engine and drive train. IT could be from ice build up on wheel sensors.
No one is going to know what is wrong with it. You must find out why the engine light is on. The PCM has detected a fault in one or more of its systems. In order to know what the fault may be you must retrieve the codes stored in it. Most auto part stores will hook up a generic OBD II code reader for free. But since its an 09, it should be under warranty. If you tinker with it, can't fix it so then take it to the dealer, they may deny your warranty claim because you worked on it first.
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