The CEL code will be the key to helping you resolve this. Your vehicle is going into a fail safe mode called "Limp Mode" which is essentially a self-preservation system that is intended to prevent catastrophic failure of the engine. Basic checks I would pursue include checking and topping off coolant and engine oil, inspecting for loose or broken electrical connectors, etc. Once you have the code read, it will isolate the problem and give you a diagnostic approach.
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