3.8 and 4.6 transmission

The transmission on my 3.6 is awful. It is rough shifting, is has a lag time for the engine and transmission to get together which gives you a nice jolt when it does. It also can't find which gear it needs to be in.

I have it at the dealer for the 2nd time for transmission problems and this time I have a 2010 4.6 loaner. The transmission in it is smooth as silk. Are the transmissions in the two cars the same? If they are I have a lemon. Of course if they aren't I still have a lemon.

I am not sure if the tranny is the same, as Internet sources are not in agrement on this issue.

I have the V-6 and the tranny is no worse than what I have experienced with other cars. In fact, it is noticeably better. Automatic transmissions sometimes get confused and produce a rough/sudden down-shift (after a hesitation) or fail to shift when they should. Being too lazy to shift for myslef, I can put up with that.

However, your car seems to have a more serious problem.

The V8 gets the ZF gearbox similar to BMW, Jaguar and Audi. The V6 gets the Aisin gearbox which is routinely used in Asian made vehicles.

msitter said:

The V8 gets the ZF gearbox similar to BMW, Jaguar and Audi. The V6 gets the Aisin gearbox which is routinely used in Asian made vehicles.

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Ditto.

Your dealer "should" be able to reprogram your transmission control module. If for some reason they have not been able to do so, try taking it to another dealer.

A previous car I had (07 MKZ) also had an Aisin 6 Speed Transmission, although not the same transmission in the 3.8 Genesis. I also had problems with the shifting of that Aisin. First my Lincoln Dealer tried a reprogram, took him an hour with the engine running, but it made no difference. A few months later, I asked the Service Manager of my local Ford Dealer if he could do anything. Took him all of five minutes. Yes, five minutes. That Aisin worked perfect after he reprogrammed it.

You may get lucky with a second dealer. You may also want to call Hyundai in California 1-800-633-5151 informing them of the problems with your transmission and getting it fixed. They "may" do something for you, but then again, they probably will not, telling you that they are recording your problem and give you a problem number, or something like that.

Tell your service rep to look up TSB 10-AT-011, AUTOMATIC TRANSAXLE CONTROL MODULE - RESET AND RELEARN ADAPTIVE VALUES.

If they've performed this TSB and you're still having problems, then there might be some other issues.

They probably haven't done it (or don't want to do it) because it requires some extensive driving somewhere where there is little traffic or stops that would interfere with completing the adaptive learning procedure after they've erased the existing values in your transmission control module (TCM).


Here's a snipit from the TSB of what they have to do out on the road:

II. RELEARN ADAPTIVE VALUES:

NOTE: After the adaptive values have been reset (erased), an “adaptive learning” procedure must be completed as shown below.

4. Attach a GDS and select VIN and A/T.
5. Select Current Data and “Throttle Position”.
6. Drive the vehicle until the ATF temperature is within the range shown on Page 5.
7. Request an assistant to monitor the GDS. Accelerate from a stop at the specified TPS specification while the transmission shifts through gears 1-2-3-4-5-6 and decelerate slowly to a stop. Stop for 5 seconds. Repeat 5 times. NOTE: Hold the accelerator pedal steady during the upshifts. CAUTION: Do not exceed legal speed limits.

If additional adaptation is needed, perform the following additional procedures:

8. Perform several sequential downshifts (5-4, 4-3, 3-2 and 2-1) at small to moderate throttle openings.
9. Perform several skip shifts (6-4, 5-3, 5-2, 3-1, etc.) at moderate to large throttle openings.
10. With the vehicle stopped, move the shift lever from P to N to D and back, stopping 3~5 seconds in each gear. Repeat 5 times.

You may read some posts that the Aisin is inferior to the ZF, but, I think they are both very good transmissions. Lexus uses Aisin tranny's in some models. What you describe sounds like the TCM needs reporgrammed. I had Volvo S80 withan Aisin 6 speed automatic, and it was silent, smooth, and quite quick to shift. Never have had an issue with Aisin tranny's. I believe them to be a very good transmission.

I got my car back today. Unfortunately it is just what I feared. The transmission was used to meet EPA mileage standards and thus is programmed to use multiple shifts. The Asain transmission isn't to blame, Hyundai engineering is to blame.

On my cruise control issue, losing or gaining three MPH over set speed is withing Hyundai parameters. The reason, it saves fuel according to the service manager. It looks as if Hyundai is meeting fuel standards on my back.

I have a Christmas dinner to attend tonight but tomorrow I am going by the Infinity dealer and looking at used M-35's. I wish at this point that I could leave the car on the railroad tracks.

My 3.8 is smooth as silk - no trans hunting, or jerking, or hesitating. Others have reported the same thing. Since this is not a common complaint Hyundai needs to fix it for you. Maybe it's time to try another dealer.