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Hyundai Sonata Transmission Problems

mepjap65mepjap65 Posts: 1
I recently purchased a 2006 Sonata V6, pre-owned with around 28000 miles. It seems like a nice, dependable car (I bought it primarily for my wife to use). One thing about its driving characteristic seems unusual, however, and I would like to know if it's common with this year/model; if anyone else has experienced this or if it might be a transmission problem. When accelerating from a stop at a steady increase in speed, the shift from 1st to 2nd seems to "lag", almost like there's a noticeable pause between shifts and for a brief second the car feels like it decelerates before accelerating again. The sensation is very slight and hard to really describe accurately, but it's there, enough to be noticed. I heard that these cars have throttle-by-wire and I don't know if that has any relation to what I'm describing. Does anyone have any ideas or comments?


  • targettuningtargettuning Posts: 1,371
    I don't believe this "lag" to be a problem however it is a known issue and I believe Hyundai has issued a TSB to reflash the transmission control module to minimize or eliminate this. I do not have the TSB number at the moment but may be able to locate it if I have the time but your local Hyundai service dept. will know what to do if you explain/complain.
  • craigbrookscraigbrooks Posts: 420
    Mine has the lag or had it. I don't really notice it anymore. I wasn't aware of a TSB for this. I know others have it and I guess I just got used to it.
  • bhmr59bhmr59 Posts: 1,598
    Question--not an answer.

    Could this "lag" be related to different drivers and the tranny trying to adjust to those different drivers?
  • craigbrookscraigbrooks Posts: 420
    not in my case. only driver of my car.
  • douglascdouglasc Posts: 3
    Is it normal for a 2006 Sonata V6 transmission to delay slightly on the first to second shift (when compared to the other shifts)?
    Is it normal to have it hunt looking for the proper gear when traveling easily at 40 mph?
  • jlindhjlindh Posts: 282
    There are a lot of previous posts on these items. I would suggest doing a search.
  • craigbrookscraigbrooks Posts: 420
    the 1st to 2nd gear lag is common. I used to notice it everytime when I first purchased mine but don't notice it all now. It's a "new" car thing. Different from what you were used to driving. Happens to us all.
  • geofwgeofw Posts: 2
    I'm thinking of buying a 4 cylinder standard transmisson Sonata.

    I have a 2005 Tucson. It has an rpm of 3,000 at around 60 mph. Needless to say, it gets noisy at higher speeds. At the same speed, my 1995 Camry is about 500 rpm lower. I can go around corners in 3rd gear without any problem.

    Anyone notice the same problem with say, 2007 or 2008 Sonatas?
  • xebraxebra Posts: 9
    55mph on highway --> 2000rpm
    60mph " " --> 2100rpm

    20-30mph climbing hill --> 2000rpm to 3000 rpm.
  • geofwgeofw Posts: 2
    Okay, thanks.
  • tkumpftkumpf Posts: 27
    Yes, my 2007 does it too. My mother-in-law also bought a 2007 Sonata about a month before I did; I'll take hers for "a spin" and see it it does it too.
  • I just moved to Denver - after about a month (one week after a cold freeze) I noticed a slight whine when the transmission is in third (approx 2300 rpm) between 38 and 42 mph. It seems to disappear immediately on shifting to 4th. I do not hear it when the transmission downshifts. I might also mention that I lived in San Diego, and, at 30000 miles had the transmission fluid changed as part of the 30000 mile checkup. I do not believe they used Hyundai fluid. This was a AAA aproved repair shop and they provided documentation that said that the transmission fluid they used was OK for the vehicle.
  • For whatever the reason Hyundai automatics require specific Hyundai branded transmission fluid. I do not believe any other generic type is recommended. As far as I know there is no other type or brand that should be used. Also,I seem to recall this wasn't a Hyundai ruse in order to force owners to buy their transmission fluid only but this requirement had roots in actual performance problems if it wasn't used.
  • The transmission fluid that was used was Valvolline Max
    Life ATF which is supposed to be consistent with SP-III. I have a signed letter from Valvoline which states that use of the fluid WILL NOT INVALIDATE the Warranty and it also lists all the vehicles that it is recommended for - which includes KIA SP-II and SP-III and Hyundai. Although I voiced some concern about this - I was assured by a reputable AAA repair shop (SAMCO in San Diego) that I was OK to use the Valvoline transmission fluid.
  • tjl67tjl67 Posts: 1
    I just bought an '08 Sonata in November, 2007. Right away I noticed a definate shutter when driving around 40mph, just prior to shifting to 4th. It will remain as long as I stay at that speed. I took it in to be checked twice. 1st time tech didn't find it, 2nd time there was a TSB, and the transmission was reprogrammed. THAT was yesterday. On the way home, sure enough, it did it again, and again. Any suggestions? Thanks!
  • This has been noted by a few with no fix so far.
  • toshastoshas Posts: 1
    I recently purchased a the 08 Sonata, my very first car. Within 200 miles I noticed the shutter at or around 40 mph. I have taken the vehicle to the dealer more than three times,and have finally been assigned a "case number" with the manufacture. I do not like, and refuse to accept this malfunction.... Does anyone have any suggestions or advice on what I can do?? I have been advised that there is no solution and this is a known issue with this vehicle.
  • hdsithdsit Posts: 58
    Well i have been struggled with this problem on my car (V6, from korean) from day one since i bought it in july 2005.
    Another with the same problem:
    All (5 or 6) similar models i have tried here in denmark had the exact same problem, and the danish importers technical manager, who also drives a V6 has the same problem, and finally accepted that there is problem that apparently cant be resolved. And i must say that, as far as i know, all have been tried from here.
    An A/T specialist even tried to deactivate the torque converter lockup by bypassing the brake-switch, but it didnt bring us closer to a solution (same shudder or even worse).
    Status for now when my cars has approx 52000 km on the odo:
    Get the tires optimally dynamically balanced (Hunter), and the vibration can be minimized (I have at least experienced that high tyre RFV (Radial force variation) and out-of-round can intesify the problem)
    The more perfect tire - the less wobble/shudder/vibration
    - But even with the most perfect tyre, as the set i have now where the RFV on all four tyre is below 2 kg, i still got a slight vibration. (Michelin PA3 winther)
    The point now is, that if i not have had all these problems from the start, and really got attention to it, then i guess i wouldnt have noticed it today. With my last set of tyres it's hardly noticable.
    I just hope that all my complains in the last 2½ year has been noticed by Hyundai and hopefylly has been resolved in the facelift...
    I'm really looking forward to try it when it arrives to Denmark in the 2. quarter of 2008.
    If it is solved - i will definately change...
    In all other areas - i think the car is perfect, and i wont hesitate to buy one again.
  • check for the "lemon law" in your area - if it is allowed RETURN THE CAR AND REQUEST A NEW ONE
  • sellcarsellcar Posts: 21
    :confuse: I have a Hyundai Sonata 2008 2.4l 2,700 miles, Automatic. It has a slow shift between 1st & 2nd gear
    Feels like a loss of power until it passes 2nd gear, fuel mileage is 19-21 city/hwy 60/40 hwy. Took it to the dealer and no codes in the computer. Any answers will be helpful! Thanks!
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