Transmission not shifting out of 4th gear - Hyundai Forums : Hyundai Forum
 
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post #1 of 4 (permalink) Old Today, 01:30 PM Thread Starter
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Transmission not shifting out of 4th gear

Hi All,


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.
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post #2 of 4 (permalink) Old Today, 01:56 PM
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Tripplec is an unknown quantity at this point
Check with some independent transmission shops that work on import cars. I am guessing its a 6 speed in that vehicle. Transmission fluid can only be checked from underneath if so. (no dipstick above)
You can google for the code if anything comes up on the forum or not.

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post #3 of 4 (permalink) Old Today, 02:19 PM
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4th gear is "limp" mode and it can be a sensor or solenoid fault that's causing it. Drive in fourth gear doesn't mean 1/2/3/5/6 are all bad - it just means the computer is in Brain Fart Mode because it doesn't have all the numbers it needs to calculate when and how to shift. They're probably there but the computer doesn't even try to use them.



Does it back up when shifted to R? If so, does it slam into reverse or does it slip/flare or does it seem to back up normally? If it does back up at all, then the 3/5/R and Low/Reverse clutches are operational. 4th gear forward uses the underdrive and overdrive clutches. The only clutch not used for 4th (forward) and R (backing up) is the 2/6 clutch. If the other four clutches are working, I'm not sure I'd find a problem with that last one.


As said above - independent transmission shops can do some digging into the unit that dealers never bother with.
It could be something as simple as incorrect fluid - which can cause damage over time, or a bad reading from any of the half dozen sensors the computer needs read in order to choose the correct ratio. Knock any one of them offline and the transmission doesn't even try to shift. A good transmission shop can plug into the car and command each solenoid and check pressures in the various circuits. Correct pressure and no drive in one or both directions means broken hard parts, and then it's time to start talking junkyard swap or hitting the local transmission shop.



If you don't know of a good local shop, you can always check here - https://www.atra.com/ShopFinder - and then cross check against the local BBB.


Check the build date on the driver door jamb. The early-build 2011 Santa Fe had some interesting software glitches in the transmission. It was very new at the time and it took a few flashes to get things working smoothly.
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post #4 of 4 (permalink) Old Today, 08:15 PM
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I like what dmlexpert says but I would say you should get yourself a scan tool that will look at all your modules. You may find an input or output exception that is causing the PCM to go into the limp mode.

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