Valve body with all shift solenoids mounted for the Hyundai/Kia A6LF1 and A6MF1 6-speed, fixing harsh shifts, flare and limp mode on Sonata and Santa Fe.
A Hyundai Sonata that slams into second, a Santa Fe that flares on the 3-4 shift and then lights the check engine lamp, a Tucson or Kia Sorento that suddenly sits in one gear and refuses to upshift - on the 6-speed A6LF and A6MF transaxles, those are the calls that most often end at the valve body. This assembly is the full hydraulic control unit with the shift and pressure control solenoids already installed, so the job is a pan-off swap rather than a teardown, and every solenoid on it starts the same age.
Hyundai and Kia built the A6LF (behind the larger 2.4L, 2.0T and V6 engines) and the A6MF (behind the smaller fours) on a shared control layout. The transmission computer never moves a clutch directly - it pulses solenoids on this valve body, and the valve body turns those signals into apply pressure for each clutch. TransGo's documentation on this case describes eight solenoids in total: two on/off solenoids and six pulse-width-modulated (PWM) solenoids. Two reducing valves sit upstream of them. Reducing valve number one sets the feed pressure to the two on/off solenoids and the pressure switch valves; reducing valve number two feeds the six PWM solenoids. That detail matters, because when either reducing valve bore wears, every solenoid it feeds gets the wrong supply pressure, and the shifts go bad even though the solenoids test fine on the bench.
Start with a scan tool that reads the transmission module, not just generic engine codes. A solenoid circuit code (open or short) can be a harness or connector problem, so check the wiring and measure the suspect solenoid first - our guide on testing a transmission solenoid with a multimeter walks through it. If the circuits are good but you have ratio codes, flares or harsh shifts, the wear is hydraulic and lives in the valve body. Knowing whether you have a true slip or a flare changes the answer, and our flare vs. slip guide explains how to tell them apart on a road test. A slip in every gear with burnt, dark fluid usually means worn clutches, which a valve body alone will not cure.
The listing names the A6LF1, A6LF2, A6LF3, A6MF1 and A6MF2, and lists the 2009-up Hyundai Sonata, Santa Fe and Tucson, the Azera, the 2012-up Elantra and the Kia models built on the same transaxle family. Hyundai and Kia revised these units over the years, and some Elantra and smaller Kia models use the A6GF1 instead, which takes a different valve body - if your tag reads A6GF1, see our A6GF1 valve body. Read the transaxle code on the case tag, compare the harness connector and casting on your old unit, or send us your year, model and VIN and we will confirm fitment before it ships. For a remanufactured alternative at a different price point, compare the remanufactured A6MF1 valve body.
If the unit has high miles and you are already in the pan, a worn pump or tired clutches will undo a good valve body. Our A6MF1/A6MF2 master rebuild kit and remanufactured A6MF1 oil pump cover the parts that usually fail next.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Yes. It ships as a complete assembly with the shift and pressure control solenoids mounted, so you do not need to transfer solenoids from your old valve body. Reusing old solenoids on a new body defeats much of the point of the repair.
The listing names the 2012-up Elantra, but several Elantra trims use the A6GF1 transaxle, which takes a different valve body. Check the transaxle code on the case tag or send us your year and VIN and we will confirm which one you need before ordering.
Use Hyundai/Kia SP-4 (also written SP-IV) automatic transmission fluid only. Set the level with the transmission at operating temperature using the check plug, since these units have no conventional dipstick.
You should have one. Clearing the transmission adaptive values lets the computer relearn shift pressures for the new solenoids. Without a reset the old learned values stay in place and the first several hundred miles can shift harshly.
Often, if the wiring and solenoid circuit check good, because the TCC control circuit and its feed pressure come from the valve body. If the converter itself is damaged or the fluid is burnt, the converter may also need attention.
Yes. Always install a new filter and pan gasket with the valve body, so debris from the old failure does not circulate straight into the new assembly.
