Sonata NF (2006-10) :: Hard Downshift At Around 20 Mph - Electrical Hum Coming From Engine Bay
Jan 31, 2012
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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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 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 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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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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So I was sitting in my car, running, parked with the ac on and out of no where I got an electrical/burning smell coming from the vents. My volts were reading 12 with ac on at idle but once my rpms reach about 7-800 it goes back to 14. My question is what was that smell? I've had 2 alternators go on this car (power draining aftermarket accessories 3.3 v6) and have driven the car for about 2 hours collective time since the problem started (usually alternator goes quick) and haven't noticed any lights dimming, ac blows cold, system still plays full tilt. could a bad compressor be causing putting some stress on the car?
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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....
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I have a 2010 sonata 4 cylinder. It has a little over 42,000 miles. I am experiencing an electrical hum from the passenger side engine bay. It doesnt stay on continuously, but comes and goes throughout the drive. Not sure what is going on with that. Also, it seems like while i am braking past 20mph the car has a hard downshift. That does seem to go away the longer i am driving, kind of like only happens when the motor is still warming up.
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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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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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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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Last Thrusday, my wife couldn't start my Sonata 2010 with 30,350 miles on it. It just clicked and sounded like a dead battery. She had to get a jump start through Hyundai road side service.
I change the battery yesterday (it only had 225 cranking amps) and immediately strange things started happening: lights flickering, engine surging, hard starting, not starting just clicking, gauge lights blink strangely at startup and when switching off ignition, not remembering odometer settings (I set my odo for MPG).
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I have a 2006 sonata with a 2.4 . It has 120,000 miles on it right now. Around 100k miles , when the engine is under load(hard accelerations), the top end of the engine starts clacking,like the rockers arms are loose. It also does it when in park and you rev it up above 3000 rpm then let off the gas. I have not had time to pull the valve cover yet.
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Well, 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.
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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.
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Why the paddles were on the steering wheel or, more specifically, why they'd move along with turning the steering wheel. It sometimes makes it hard to downshift going into a turn or upshifting coming out of out a turn, especially if you don't use the paddles a lot.
well, today, I got to drive one of these and the paddles are in a fixed position. it's MUCH easier to shift knowing where those paddles are at all times when driving faster than you're supposed to. of course I was doing a little spirited driving. downside to that car (only a little) is that it's LOUD. you like the sound of an R?
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Few days ago I noticed the noise coming from the engine.
Went to dealership. They removed the oil pan and found metal shavings there .The car has 90,000 miles. They will put a new short block (will be covered by warranty ).
Since they basicaly will disassemble the whole engine, I thought to ask them to replace also drive belts, timing chain tensioner, not sure if the short block comes with the water pump , will ask them . W
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I notice it now for awhile this whining noise coming from the engine. It sounds like bearing noise to me. The car is still under warranty till 12 Oct 13. So if needs a fix, it have to happen soon.
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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.
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I have a 2007 Hyundai Sonata 2.4l GLS. Staring to get an little noise from the engine about a few days ago. The noise what can only describe as a whirring sound and while in the cabin it sounds like it's coming from the right side and in the engine area, especially after a cold start and during acceleration. It is not very loud(have to turn stereo off to hear it and it only last for a couple of seconds as far as I know. My car now has about 240,000kms on it, and since the noise is coming from that area I am guessing it's a pulley of some sort. Serpentine belt was changed last year. What this noise is? I was thinking it might be the belt tensioner, probably should have changed it during my belt change.
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