Hi there. Not knowing what you are specifying what you are looking for to fix or repair your transmission, all I can mention is check all the fluids in your transmission and make sure that the fluids are full. Top off any fluids that are low. If your vehicle has the check engine light on and the codes are talking about the transmission, then there could be a solenoid not working, the pump not working, or the transmission could have an issue with an internal component. I recommend seeking out a professional, such as one from Your Mechanic, to help you diagnose your transmission if you are have troubles with it.
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