Sonata NF (2006-10) :: Automatic Rough Downshift Into 1st Gear
Apr 20, 2011
My 09 Sonata GLS has 50k miles on it. I bought it as a demo model with 9k on it (regret that) as new ... who knows how it was treated.
at 40k miles I noticed that in the morning when I was braking the car would feel like it was slipping out of gear momentarily and it was pretty rough. After a few minutes it would stop and I could continue on my way. The car is an automatic. I noticed it if I let the car decelerate enough that it dropped into first on its own, or if I used the brakes. I figured it must be due to the cold weather or something and was hoping it would clear up. This was only happening after 8 hours of non-use, overnight in the cold.
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My 2009 Sonata (4 Cyl.) has begun to downshift very rough while coming to a stop from about 20 mph. At first I thought it was the brakes, but now I'm convinced it's the transmission. Essentially it "jerks" a couple of times before stopping. It started happening at 30,000+ and only happens when transmission is still cold. Once I've driven for a bit it doesn't happen.
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So the problem is that I have a jerky downshift 3-2 and 2-1 that can be felt by everyone in the car (car pushes forward on downshift) until the car warms up. When the car is warm I can feel it slightly at times and feel a clunk when shifting down 3-2 and 2-1. On up-shifts at times the shifts are shaky from 1-2 and 2-3. I have brought this forward to my dealership as well as another one. They all performed software updates and reset the adaptive learning. However every time I got my vehicle back after this procedure I found the A/C was on full blast. So the initial drive by the tech after the reset was learning while the A/C was on. Would this be causing the weird shifting I experience while the A/C is off. I seem to notice a better shifting when the A/C is on but this may just be me trying to reason why my transmission is behaving this way. I drove other 2015 Sonata's and they have much better shifting than my car and no hard jerks on downshifts.
Both dealers have felt the downshifts and have come back and simply said "We've done all the updates and reset and learning. This may just be a normal characteristic of the car." I told them that a brand new vehicle in this day and age shouldn't be shifting poorly when compared to an older vehicle with 300,000 km (my old Honda Civic which are prone to transmission failures). They responded casually saying you can go and get a second opinion from another dealership if you like. I am furious with their responses and just left it at that. I need to know how to get this resolved and if this is indeed something I should expect from my Sonata.
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I have an 06 sonata 4 cyl automatic.Today the transmission was slipping in first gear like the car was revving in neutral.Then after restarting the car it was completely normal. Code P0731 showed up.
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I own a 06 sonata with 95000 miles. Recently I've been having issues with my transmission. It occurs only at slow speed when i travel in first gear. What happens is when the car is moving, it feels like it shifts into neutral but indicator still shows D in the cluster. I press the accelerator nothing happens it just revs,no increase in speed whatsoever.
So that rules out slipping issues. Now i narrowed the problem down a little more whenever the problem crops up i shift the gear lever into sports mode, i feel a jerk and car shifts into first gear and it moves. If i dont shift into sports mode it catches gear in about 7 seconds.No fault codes.
And if i rev it high transmission goes into limp mode and stays in 3rd gear till i restart the car.Then i get P0731 incorrect first ratio.Changed ATF 7000 miles ago. Could it be a faulty range sensor?
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I have a 2006 Hyundia Sonata. I idles really bad like you pulled 5 of the six plug wires off when you put it in gear. Once you start moving a couple miles an hour it is fine. It is also perfect in park or neutral, not a hint of a problem. Put it in drive or reverse and it almost stalls.
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2007 Sonata V6 with 72K miles.
The car has developed a rough idle while in gear (i.e. when stopped at a stop light) and park (i.e. after I start the car).
It's starting to get a little annoying since I'm used to a very smooth idle.
I think this issue started within the last 2-3k miles.
Plugs were allegedly changed at 30k. A full tuneup was done at that time.
Wires are still original.
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When I'm slowing down, usually about 35 mph which i think is going from 3rd to 2nd gear, there is a noticeable rough down shift. Nothing horrible, but definitely much more noticeable than the shifting of all the other gears.
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2006 Sonata V6 with 98K miles. The car has developed a rough idle, sputter/lurch while in gear, but not park or neutral. No CEL/codes. Have already replaced the spark plugs (OE), throttle body/FI cleaned, MAF cleaned, new air filter, coil packs OK... Mechanic said no vac leaks, FI spray pattern good, good fuel pressure, etc. Vibration dampener looks ok, no separation or wobble. Another post mentioned a power steering pressure sensor, which I will have checked, but the mechanic is at a loss.
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2006 Sonata 2.4 (4-cyl)? My Sonnata has rough idle while stopped and in gear feels like it wants to lurch while holding the brake down, runs great at running speed. I did have the problem with it stalling while stopped but cleaning the throttle body remedied that problem. I've changed the spark plugs and one coil,the pcv valve, the front O2 sensor (with a universal spliced in sensor), and the air filter has been changed as well. I keep getting P0304 (cyl. 4 missfire) and P0032 (O2 sensor), I've swapped out both the coil and spark plug with another cylinder and the code still shows for cylinder 4. I've also checked for vacuum leaks and I can't find any.
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I recently bought a 1998 Honda Accord with 124,000 miles. The car had one owner for 14 years. The carfax indicates the owner maintained service on the vehicle, but didn't go into detail about the work that was done. (only that the started had be replaced) When I come to a complete stop the car downshifts rough into first gear. It almost feels like it slightly jumps forward. Is this a problem I need to address and if so what is the problem? I bought it from a trusted dealership who had their mechanics give it a check and said nothing was wrong with it.
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My 93' Ranger XLT extra cab 2wd, 4.0 engine and A4LD auto tranny with 126,600 miles has a rough downshift into 2nd gear about 15 or 16 mph. Down shift to 1st is real smooth and upshifting thru the gears is smooth. I just put a new modulator valve on it and upshifts smooth out, they were getting to be hard shifts before changing that valve. I do not know if there is any adjustment that can be made to smooth out the rough downshift when slowing down to a stop for red light. The U-joins are in good shape and new carrier bearing assembly on driveshaft and no extra play in the rear end. A band adjustment maybe or just have to live with it.
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I have a rather strange issue with my '11 sedan gl and it appears to be getting worse but the issue is so intermittent that its hard to find a pattern.
The problem is that sometimes in the first 5 minutes of a drive, I will have very rough gear changes. Its an all or nothing usually. If I start my drive, it will either do it or it wont and if it does, its gonna last a good 5 minutes or so at every gear change.
When the gear changes, I will feel a jolt a bit like I would tap the brake a little and the gear will engage but will take a good second or two before doing so. When the car runs smooth, the gear changes are smooth and quick but I just get that strange behavior once in a while and when it happens, I always wonder if the transmission will break on me.
The occurrence of this is rather concerning as of late. Last winter as an example, it happened only 2-3 times the whole winter. Lately however, it is almost doing it every day (I've had it happen maybe 3 times this week).
I went to the dealer. No error codes and they can't find anything wrong with it and since this happens only during the first 5 minutes or so for the entire day, when they do a test run they of course can't spot the problem. I went to a local garage and same thing there again same response.
At first I thought that I didn't leave the car idle long enough during the cold winter days but we are in the 20 degrees Celsius now. At startup, I always wait until the engine drops the rpm back at 1000 or so before getting on my way (which is between 30 to 60 seconds).
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My 2010, 4 cyl. auto started giving me hard downshifts awhile ago, when cold. Mainly going from 4 to 3, and 3 to 2. I had the tranny fluid changed a few months ago at 56,000 miles, but no difference. So, that left me with the dealer and this is their diagnosis:
Updated ECM and TCM and hard shift still present. Vehicle will require new PCM (TCM?) to resolve problem.
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My car also had the hard downshift when engine was cold and under 30mph. I seen where Sbr 711 had posted the TSB 10-AT-007-1
I printed this and took to the local dealer & also showed where it was mentioned as a recall.. The advisor looked up on his computer and showed no recalls for the 09 sonata?
I went ahead and scheduled the reprogram update and was told the technician can pull up more info on recalls than the advisor can? Any way they did the reprogram today and $89. later still no recall? How do I prove that in fact this is a recall & get refunded?
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My 09' has developed the abrupt downshift issue at 20 mph when cold. Once the transmission is warmed up, the problem goes away. There is a Service Bulletin on this problem so it is known and a fix is in place. The fix according to the Service Instruction is to remap the transmission software.
How this remap affected their vehicle. My car has been returning great gas mileage, and I am concerned that this fix could hurt that. If mileage is adversely affected, I'd rather live with the downshift IF it won't hurt anything.
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I just bought a 2009 Hyunda Sonata, 4 cylinder limited edition with 82k miles on it about a month ago. It was maintained to the suggested maintenance schedule by Hyundai dealers prior to me owning it.
after about 2 weeks, it started having issues when slowing down. I narrowed it down to being a harsh downshift from 4th to 3rd when breaking when cold. After driving for 10 minutes it doesn't do it anymore.
My temporary fix is to manually downshift it into 3rd when I have to slow down. It seems to be that it stays in 4th too long and shifts late into 3rd, but I wouldn't think downshifting late would really matter.
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My Hyundai is giving me a major headache. I bought a 2009 sonata used a few months back. Not long after I got it, I was having issues with it jerking around 20 mph. Sometimes, it would have a few issues with it jerking some when I was taking off. This was only right after the car was started. I took it to a local Aamco. The guy told me that it was a 2-1 downshift pump. He "relearned" the transmission and the problem went away. Now, it is back. At the time, he did some research and thought it may stem from a calibration update they had issued. He didn't have the Hyundai software to try that fix.
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I have 2010 Sonata with 4 cylinder engine and 50,000 miles. For a while now, my car has a real hard downshift at around 20mph. When i put the car in shiftronics mode and do not downshift manually, at the 20mph hard downshift the car is shifting from 4th to 3rd. A while back i had the TSB for hard downshift and also did a tranny fluid flush. Neither has seemed to solve the problem.
Also, the car has a annoying electrical hum/whine that is coming from the engine bay. When i shift car into neutral the hum/whine goes away. Also sometimes when shifting into lower gears the hum/whine will go away for a short period of time.
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Experienced an accidental shift from automatic to sports mode when attempting to "park" your Sonata? It happened to me last weekend. My car shot forward like a torpedo, doing considerable damage, not just to my car but to others as well. I have often thought it takes no effort to switch to the sports mode, but have never used it. Now I wish it were not available.
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I have a 2009 2.4/auto with 32000...original owner...just noticed a weird tranny issue develop over this past cold week in NY...when coming to a slow stop the trans will harsh shift as it down shifts from 2 to 1...
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