Anyone Else Had Tsb 08-at-004 Applied? - Hyundai Forums : Hyundai Forum
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#1 Old 02-18-2011, 07:57 PM
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2008 Sonata GLS, 2.4L, 4-speed AT

The other day, I had my dealer reprogram my transaxle, per TSB 08-AT-004 (relevant text from this TSB is pasted below). I had the issue described in the TSB, where there would be an annoying low-frequency noise at steady ~40 MPH speeds. This issue had something to do with the way the transaxle shifted into overdrive.

Now, the noise is gone, but I can't tell if overdrive is working (i.e. if it's being used at all). Even when I take the car onto the expressway at ~70 MPH, if I shift into 4th gear, then back into D (while remaining steady on the gas pedal), the tachometer doesn't seem to budge. If it were shifting into OD, I would expect the tach to go up when shifting into 4th, then back down when putting it back in D.

I'd love to drive a similar Sonata to see what the tach should read at 60 or 70 MPH. I never paid attention to that--or to how OD behaved--before having this TSB carried out.

Do I need to go back to the dealer?





Text from TSB 08-AT-004:

--------------------------------------------------------

[b]DESCRIPTION:

Some Sonata 2.4L vehicles with automatic transaxles may experience a vibration, shudder or booming noise at 38-42 mph in 4th gear. If so, follow the procedure to update the ECM and TCM.

[b]APPLICABLE VEHICLES:

Model: 2008 Sonata 2.4L (NFA) vehicles with automatic transaxles

Applicable vehicle production date range: From February 8, 2007 to October 4, 2007.

--------------------------------------------------------

(The rest of the TSB provides detailed information on reprogramming the transaxle.)
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#2 Old 02-18-2011, 08:07 PM
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While going down highway, just slap the shifter over to Sport mode, see what number is illuminated on the cluster..


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#3 Old 02-18-2011, 08:11 PM
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That's what I'm doing. I shift it over, it goes from D to 4, but I can't tell that the tach is changing. Should it be an obvious change in RPM?
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#4 Old 02-18-2011, 09:34 PM
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QUOTE (Negative 1 @ Feb 18 2011, 06:11 PM)
Quote:
That's what I'm doing. I shift it over, it goes from D to 4, but I can't tell that the tach is changing. Should it be an obvious change in RPM?
The tach wont change just moving it to sport mode, it will just show you what gear it's in and allow you to shirt manually. The tach will only change if you switch gears.
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#5 Old 02-18-2011, 09:40 PM
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But the moment I switch it into sport mode, it shows it's in 4th gear. Sport mode disables OD.

If I start in D, and I'm driving at a steady speed, wouldn't it have to shift out of OD and into 4th gear to display &quot;4&quot;? And then if I put it back into D, shouldn't I expect it to go back into OD?

I've even tried shifting into 3rd, then 4th, then D. Going from 4th to D, I can't tell by the tach that it's going into OD.
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#6 Old 02-18-2011, 09:57 PM
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QUOTE (Negative 1 @ Feb 18 2011, 07:40 PM)
Quote:
But the moment I switch it into sport mode, it shows it's in 4th gear. Sport mode disables OD.

If I start in D, and I'm driving at a steady speed, wouldn't it have to shift out of OD and into 4th gear to display &quot;4&quot;? And then if I put it back into D, shouldn't I expect it to go back into OD?

I've even tried shifting into 3rd, then 4th, then D. Going from 4th to D, I can't tell by the tach that it's going into OD.
I thought that the top gear of 2008 was 4th. 2009/10 has a 5th gear. 2011 has a 6th gear. There is no separate indicator for OD that I'm aware of on my Sonata, just gears 1-5. The torque converter will lock-up in top gear when the computer determines that conditions are appropriate for it to lock-up, but there is no indicator denoting that state.


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#7 Old 02-18-2011, 10:07 PM
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I'm confused.

I do know that 2008 Sonatas were available with 4-speed ATs and 5-speed ATs.

I've always thought that overdrive was never included in the naming of the AT. By this I mean that a "4-speed AT" would have 4 regular gears, plus OD. And a "5-speed AT" would have 5 gears plus OD. That's been my thinking.

I guess I'll have my answer when I refill my gas tank next time. If my mileage has gone down by 5 MPG, something is probably wrong.
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#8 Old 02-18-2011, 10:29 PM
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The v6 has 5 gears the 4 bangers have 4 the transform nf those got 5 gears
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#9 Old 02-19-2011, 12:09 AM
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Overdrive is a transmission speed which gives a ratio of less than 1:1, i.e. the transmission output shaft turns faster than the transmission input shaft

On your particular model, 4th gear is OD. On the 2009/10, 5th gear is OD. On the 2011, 6th gear is OD. On most vehicles nowadays, the top gear is usually OD and is simply another gear. Older GM vehicles used to have it as a special gear selection, 1-3 and OD, so you could manually lock the transmission into OD. Nowadays the computer controls all of that so the OD terminolgy has kind of fallen to the wayside.


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#10 Old 02-19-2011, 11:34 PM
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mamamia
Somebody is mixing up some things here....

The OP's car has 4 gears PLUS an OverDrive. But the display will show only 4 as the top gear. I don't have much experience with shifting into manual, but when you drive the car (leaving it on D), if you listen to the engine, and look at the tachometer (maybe it's safer to let someone else drive when you do this?) ----- you SHOULD notice the car shifting thru the 4 gears and then into OD. You should see the tachometer going down a bit when the car shifts into OD. It should do that much sooner than at 70 mph, btw, more like at 50.....

The annoying low-frequency noise that the engine was producing was when the car shifted into OD too soon, lacking power.
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