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You must use CVT transmission fluid. There are friction modifiers in the CVT trans fluid that aren't in traditional transmission fluids. It won't happen immediately, but eventually the internal components of a CVT transmission will fail as a result. Keep in mind, the standard fluid -vs- CVT fluid ratio will determine the amount of time it takes.
Since the two are mixed at this point, the system should be power flushed to remove all of the wrong fluid.
If the vehicle stays locked in park, that is a different issue. The vehicle has a park lock solenoid as a safety feature. It won't shift from park unless the brake pedal is depressed. Now, if it doesn't release when pressing the brake, suspect either a bad brake light switch or the park lock solenoid may be going bad and not releasing. The brake light switch provides power to the actuator / solenoid to release it.
To determine if it is the brake light switch is failing, check to see if the brake lights turn on when this happens. If they don't. Suspect a bad switch.
Let me know if you have other questions.
Friday, October 12th, 2018 AT 5:11 PM