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Regarding the problem, refilling transmission fluid is only forst step in troubleshooting.
The problem is often either the shifter console, the transmission control unit (TCU computer module), or a faulty transmission box itself.
Next step in troubleshooting is doing a code scanning. An OBD II code scanning can be done at home or at any garage, but to do a complete code scanning that includes scanning of transmission control module you need a Vag Com tool. This is expensive and it is available only at the dealer place or at a VW/Kia authorized garage. Scanning is usually billed half hour labour, and it is not expensive.I wrote an article on same problem here. Disregard the part on "stuck in park". Article was originally written for Mercedes. Things are not too different with the Kia carens tranny.
Job is carried doing in order:
- OBDII code scanning, then TCU scanning.Testing for fault indicated in codes if needed.
- Bleeding and refilling transmission fluid.
- Removing cover and checking shifter lever state and conditions.
- Checking for tranny fluid leaks in vacuum system.
- Testing the TPS (throttle position sensor).
- Checking transmission shift solenoids (in valve body), wiring and TCU operations.
- Checking the transaxle itself for malfunctions.
Job bill may start from one or two hours garage if you have some silly problem like faulty TPS, and if problem is spotted at start. Repair can get very expensive if you have for example a defective gearbox.