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Old 01-18-2012, 07:33 PM   #1 (permalink)
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brsexton
Default 09 Transmission BUZZ

Hello all. This is an odd one. I own a 2009 Kia Optima 2.4 Auto. My good friend and his wife own a 2009 Sonata 2.4 Auto. My car has around 40k and his has 50k. We both notice a very strange noise that started well over a year ago on both cars. After driving for a while, then you stop at a stop light or go through drive-thru, the transmissions BUZZ. If you put the car in Neutral or Park, the buzzing stops. Even if you put the car back in gear, it won't make the noise again until it decides to do it again. They both only do this when the transmission fluid is hot. Never does it when they are cool and have not been driven. Both cars have had the transmission fluid changed at 30k and this noise was mentioned to both dealers at the time. Both cars had transmission related TSB software updates done, but nothing changed as far as the noise. Neither car would buzz for either dealer, so they were no help. I just find this odd that it is BOTH cars. Of course they have the same engine and trans, I just wonder how many more folks have this odd ball noise. It really sounds like a power steering pump thats low on fluid. Fluid levels are perfect. Any suggestions? Both of us are kind of stumped.
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Old 01-19-2012, 12:29 AM   #2 (permalink)
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....I notice quite a few here read your interesting story, but no one came up with an idea... So let me suggest something that has been already posted here, and many times:

Hyundai is using their own ATF fluid which is actually INFERIOR, in comparison to a product called Castrol Import Multi-Vehicle ATF, which many here, me included, have been switching to... If you do the search you'll find those threads and posts... My tranny has been behaving a lot smoother since I changed to Castrol's at around 30k. All those occasional yet annoying "hiccups" that were typical, especially when I was driving a bit more "aggressively" -- are gone. If you get no other clues here, I'd pay the extra money and do the switch.... You'll only be giving your transmission a better ATF fluid to work with.
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Old 01-19-2012, 01:12 PM   #3 (permalink)
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The mechanic that changed the trans fluid on my Sonata said that Hyundai does use a 'funky' fluid in new transmissions. He said it almost looks like lawnmower oil.
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Old 01-19-2012, 05:22 PM   #4 (permalink)
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Quote:
Originally Posted by Bimbo View Post
....I notice quite a few here read your interesting story, but no one came up with an idea... So let me suggest something that has been already posted here, and many times:

Hyundai is using their own ATF fluid which is actually INFERIOR, in comparison to a product called Castrol Import Multi-Vehicle ATF, which many here, me included, have been switching to... If you do the search you'll find those threads and posts... My tranny has been behaving a lot smoother since I changed to Castrol's at around 30k. All those occasional yet annoying "hiccups" that were typical, especially when I was driving a bit more "aggressively" -- are gone. If you get no other clues here, I'd pay the extra money and do the switch.... You'll only be giving your transmission a better ATF fluid to work with.

I have read some very good things about the Castrol on here and the Kia forum as an upgrade from the OEM SPIII, but I am scared to switch because of the Warranty. I've heard that Hyundai/Kia have voided many powertrain Warranties because of "non-approved" fluid being used in the transmissions. But you're right. The fluid could be causing this noise. OR, my friend and I could just need our transmissions replaced.
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Old 01-19-2012, 05:47 PM   #5 (permalink)
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Quote:
Originally Posted by brsexton View Post
I have read some very good things about the Castrol on here and the Kia forum as an upgrade from the OEM SPIII, but I am scared to switch because of the Warranty. I've heard that Hyundai/Kia have voided many powertrain Warranties because of "non-approved" fluid being used in the transmissions. But you're right. The fluid could be causing this noise. OR, my friend and I could just need our transmissions replaced.
I have called my local dealer regarding this warranty issue and confirmed that as long as an SPIII compliant ATF is used there is no effect on the transmission warranty. I have used VersTrans with no issues.
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Old 01-19-2012, 06:09 PM   #6 (permalink)
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I have used VersaTrans with no issues.
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Old 05-02-2012, 04:00 PM   #7 (permalink)
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Post KIA Optima 2009 transmission BUZZ

Hello, I have had a buzz in my transmission since 5k, only in reverse then and not all the time.Then around 18k I started hearing it in drive, also. At 25k I just had it to the dealer who only heard it in reverse and told me that was a normal sound of the transmisssion shifting into gear. WHAT? He mentioned something about the electronic transmission. Now I hear it all the time, and when I drop into neutral while it is buzzing, it stops.
I have an extended 120 month, 100k warranty, and am seriously considering trading this in for a Toyota. Besides the fact the dealer gives me a diffiernet story regarding the warranty reqs....doI change the trans fluid at 30k or 60 like the manual says? Feels like it is too ambiguous

oh btw, I had a thermostat housing leaking coolant. They could not find it, but I stayed there until they did find it. You mean the puddle under my car and the maple syrup smell were all in my head? As if I don't have better things to do than spend 5 hours at the service center!!!
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Old 07-09-2012, 01:46 PM   #8 (permalink)
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spence
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Have the exact same problem with my 2009 Sonata with the 2.4, It's been occurring since ~55K miles. I'm at 90K and getting ready to bring it back to the dealer. Had the transmission fluid changed at a local shop same problem. Not sure which fluid they used.
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Old 07-10-2012, 05:28 PM   #9 (permalink)
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Wife's had "buzzing" in reverse other day, but also a P0708 OBD error. Trans Range Sensor error... it was 103 Degrees that day and next day I could not recreate problem.

49K miles on it and Trans Fluid looked like the lawn mower oil someone mentioned. Gonna change ATF and then get a better look at the sensor.
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