Kia Troubleshooting Questions? Ask a Mechanic
Hello, have you pulled any diagnostic codes?
If the transmission is revving to 4 grand rpm and then slamming into gear the transmission has an internal failure and will need to be replaced. This is not a simple sensor failure , no transmission should ever do this, internal clutches are failed. trash from the failed clutches has gotten into the valve body and damaged the shift solenoids, thats why it is slamming into gear. Please accept my answer, if you have any further questions I will answer them until you are completely satisfied with my answers.