Join Date: Apr 2019
Location: Littleton, CO
Drives 2011 Santa Fe SE 3.5L V6 AWD
Also own 2011 Santa Fe GLS 2.4L 4 cyl AWD (wife's car)
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Transmission not shifting out of 4th gear
Could use some suggestions. My 2011 Santa Fe SE (3.5L V6 AWD) just recently stopped shifting out of 4th gear. When it should shift, the engine just races. The OBDII code it is throwing is P0734 - Incorrect Ratio 4th gear. Had it towed to the dealer, and their diagnosis was "P0734 - Incorrect Ratio 4th gear: you need a new transmission." They couldn't tell me anything they checked, nor anything else that may be wrong with it, but admittedly they said they don't repair transmissions, only replace them.
I can't seem to find many details about this error code with a 2011 Santa Fe, but in some other Hyundai models it seems to be a bad bearing that can be replaced by the user (with a fair amount of work). I am hesitant to dig into the tranny without knowing if this code in my tranny might be a similar bearing, or whether there might be another possible fix. Any suggestions would be greatly appreciated.
I've only had the car a bout 6 months, having bought it used, and I am the third owner, so I don't know whether there has been a history of tranny issues or not.