2004 Sonata bucks violently trying to shift into 2nd gear

20

Asked by BobandLibby Mar 14, 2018 at 11:24 AM about the 2004 Hyundai Sonata V6 LX FWD

Question type: Maintenance & Repair

I have a 2004 automatic 2.7 v6 Hyundai Sonata LX.  While sitting in the
driveway, My car idles fine and I have no problem reving the engine up to high
rpms in either park or neutral.  I also have no problem shifting to any of  the
gears, nor do I have a problem backing out in reverse.  Driving slow in first
gear also works fine, but when I accelerate fast enough to shift into 2nd gear,
the car bucks so violently that I feel like I’m going to be thrown through the
windshield.  The car never makes it into 2nd gear.  I replaced both input and
output speed sensors, as well as the throttle position sensor, but that did not
help whatsoever.  Any ideas?  Does this sound like a bad transmission
solenoid?

1 Answer

20

Problem Solved. As a last resort I decided to change all five transmission solenoids. This was my first time working on a transmission. Surprisingly, it wasn’t as complicated as I was ancipating. To gain access, I only had to remove the battery, radiator hoses and fans, and loosen/move the ignition coil assembly (3 bolts) out of the way to gain full access to the side transmission cover. From some Youtube video, I was anticipating having to drop the subframe, but it wasn’t required for my Sonata. Upon closer inspection, I noticed an O-ring failure on one of the solenoids. The O-rings on the other solenoids looked like they were starting to go bad, as well, so I replaced all five. My car now shifts smooth as silk.

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