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.
View 7 RepliesI 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...
View 8 RepliesMy 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.
Or just can I just replace and go. I'm having some issues with trans on my 06 gs430. It's having a downshift clunk/jerk when coming to a stop. I just purchased a used trans, but would like to see if it could be ecu related. I have seen other comments from other member that they replaced the trans, but still the issues were present. Some stated that there was some issues with the ecu holding the trans solenoid longer then the usual.
View 6 RepliesI 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.
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.
View 6 RepliesHave a 2007 Sonata (2.4 L inline 4) and been plagued with rough/shaking car when initially started and pull to stop, and generally goes away when fully warmed up. Recently had oil change and service area switched me to a lower viscosity oil (5W30 to 5W20) and checked a solenoid and it was fine. Also did a fuel service treatment I suppose in an attempt to flush out stuff........I was a little surprised he didn't pursue talking about tuning up aspects but maybe none of those codes flashed......a repeating code I do have is Code 11.........though I confess when the codes refer to emission stuff I sort of ignore them.......
View 12 Repliesi drained the 30000 mile fluid two weeks ago because it was harsh downshifting when coming to a stop... I was curious if others noticed a lot of metal sludge sticking to the magnetized drain plug???..
View 3 RepliesLexus IS350 ... Noticed a reasonably quiet clunk from the car when coming to a stop? It happens when the transmission automatically shifts into 1st gear with your foot on the brakes.
I noticed that in my car, you can feel a slight lurch forward as the transmission downshifts into first when approaching a stop sign. If I am barely on the brakes, I feel the slight lurch but don't hear anything. Under normal braking, that slight lurch happens along with a clunk. You wouldn't hear it with the radio on, but it's very repeatable and with the windows down you can hear it as well coming from under the car somewhere.
This last month I have been noticing that either when I am coming to a stop the transmission down shift hard.... and when moving from a stop it gives two bucks like a standard does when u let the clutch out to fast... so i went into do my oil change and asked them to look at it.... guess what its getting a new tranny..... makes me want to trade it in when i get it fixed....
View 14 RepliesI have an intermittent issue where the tiggy seems to downshift harshly to 1st when coming to a stop while in D. Almost like dropping the clutch but not enough to chirp the tires - just enough to feel a thump. I figure it's related to the engine braking "feature" of this car but doing it incorrectly. It seems as though once it's happening, it stays like that for a while, but the next day for example, it will be fine.
I've been observing it for some time now and it doesn't seem temperature specific. In fact, I have a hunch it might be electronic even since if I turn off ESC it stops occurring. Turning off brake auto-hold doesn't make a difference either (this is turned off automatically if ESC is shut off).
I hate taking my car into the dealer for intermittent issues... they are notorious at dismissing something if it doesn't happen right then and there in front of their face. Thought maybe I should check the forums incase their's a TSB or something to fix this exact issue or if it's just unique to my tig.
2010 (build date 8/09) 4motion SE btw, w/ 5k miles
My 2007 Sonata V6 limited would produce a pop / clunk sound (sometimes 2-3 in succession) under these circumstances
- Car is coming to a stop (brake applied)
- When I release my brakes, press on the accelerator, a pop / clunk sound would ensue
It doesn't happen all the time. I noticed it's more prevalent when it's hot outside or when I've driven the car for a little bit
My mechanic re-tightened the subframe bolts and visually checked bushings / ball joints but everything seems tight.
Is there a replaceable bulb for the check engine light? Mines stop coming on when starting the car. I think that's why I failed the emissions test. I didn't check with the attendant in the office to get an explanation.
View 1 RepliesMy 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.
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?
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.
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.
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.
View 3 RepliesWell, After reading about the weird transmission issues these cars have...mine finally started to do it. It will clunk, shake the car when it shifts and downshift for no apparent reason. All of this does NOT happen all the time. The noises that come from my transmission do though.
I can have the car in Drive and have my foot on the brake and I can hear a grinding/low power steering fluid like sound that comes and goes. Its worse when I shift from Park to Reverse though. It sounds like air being released followed by a bunch of faint grinding noises.
While in Tow/Haul with my 5th wheel when slowing down probably at 5 or 10 mph the last downshift is very hard and the brake pedal gets real soft until full stop. Afterwards the brake pedal is firm. Tow/Haul without the trailer is fine. It's an '06 F250 Supercrew 4x4.
View 6 RepliesI am the original owner of a 1993 Nissan Altima. My mechanic states that the air intake (part # 165751E400 "air duct")has dry rotted. He put some silicone hoping that would seal it but it did not work. The part is no longer available from Nissan. The car runs very rough and wants to stall when coming to a stop. It also smells like gasoline in the cabin and the gas mileage is terrible 17 mpg. I have tried to find someone who could custom make a new hose with no luck. My mechanic stated that pulling one from a used car would have the same problem. What other options are available? The hose is about 8 inches long and about 3-4 inches diameter. It has other small hoses that attached to it. Do I throw away an otherwise reliable car?
View 4 Replies