Can be one of over a 1000 different reasons ----need to get vehicle scanned for the trouble code the code will give you start point or assist in correcting the problem ---most auto stores offer this service for free
If the check engine light is on then there is a problem in the engine or transmission or a related system. You may be in what is called "LIMP" mode. What needs to be done is have the dealer or a well equipped shop run a fault code test and do the diagnostics associated with the code or codes.
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