Shifting problem, automatic transmission

You can not disable the automatic downshift if it is a harsh shift you have a defective transmission or other shift control issue. I would go with the transmission being defective. Has the fluid and filter ever been changed? should be done at about 60,000 miles for optimum transmission life and function.

Once again, not enough information given. How many miles on unit? When you say does not downshift do you mean when you press hard on accelerator pedal, or when you slow down? When you say does not shift into overdrive do you mean high gear or torque converter does not lock? The cars are know for transmission problems and while sometimes you get lucky, usually they require a rebuild or replacement. How often do you replace the fluid and filter?

Hello
The Engine and Automatic Transmission (not applicable to manual transmissions) in this vehicles drive train are fully electronically controlled by a computer called the PCM and TCM (Power Train Control Module, Transmission Control Module). When a problem like this or other drive-ability related problems occurs the computer stores a record of the problem (there are of course some exceptions to this, like the fuel pump, engine coolant temperature sensor and MAF sensor for instance) in the form of a fault code in its memory, to read these fault codes you must have the systems memory scanned with a special tool. Once the fault code(s) are read you then must perform the appropriate diagnostic testing to find and resolve the problem(s) DO NOT REPLACE ANY PARTS UNTIL A TRAINED TECHNICAIN HAS DIAGNOSED THE PROBLEM TO AVOID SPENDING YOUR HARD EARNED MONEY ON PARTS THAT MAY NOT CORRECT THE PROBLEM. Also always check fuel pressure for correct spec for your make and engine type.

If you have the C5 trans, here is the info:

C5 Transmission

1. Disconnect the negative battery cable.
   
2. Raise and support the vehicle safely.
   
3. Remove the downshift linkage rod from the transmission downshift lever.
   
4. Apply rust penetrant to the outer lever attaching nut to prevent breaking the inner lever shaft. Remove the transmission downshift outer lever attaching nut and lever.
   
5. Remove the two neutral start switch retaining bolts.
   
6. Disconnect the multiple wire connector.
   
7. Remove the neutral start switch from the transmission.
   

To install:

1. Install the neutral start switch on the transmission. Install the two retaining bolts.
   
2. Adjust the neutral safety switch following the above procedure.
   
3. Install the outer downshift lever and retaining nut, and tighten the nut. Install the downshift linkage rod with the retaining clips.
   
4. Connect the wire multiple connector. Check the operation of the switch. The engine should start only with the transmission selector lever in N or P.
   

If it is the:
C3 And A4ld Transmissions
It's on the transmission....


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Neutral start switch and its location on the C3 and A4LD transmissions

Providing there are no oil leaks at all, some transmission stabilizer may help. Any experience i've had with a whining 5 speed, is not good. Usually it's a bearing on it's way out. Try some of this, and see if it makes any difference. RISLONE® TRANSMISSION STABILIZER

I believe you have a 4l60e transmission.Do you have a chck engine light? The unit may have a 3-2 downshift solenoid going bad or a possible band ''servo'' leaking. The band applies in 2nd and 4th.You may also have a shift solenoid starting to malfnction......Best

Okay, I baught an 01' tiburon last march. When I first had trouble with the tranny it wouldnt shift into fourth and no it wasnt the overdrive button. Then it started downshiftling like what your experiencing then I lost reverse. Ammco rebuilt the tranny. I would take it to them, they will inspect it for free. You may just need a tran fluid flush. You should know that in the automatics the tranny is the weakest part of the car. The engines are great, just everything around them seems to fall apart after 120,000 miles.
Ammco offers a free inspection service. However Just from experience - if you need a new auto tranny it is cheaper to buy one already rebuilt (with warrantee) and pay to have it installed than to rebuild the one you have.
Cheers to hyundai challenge : )

Dear sea_lion42, Friday 2-20-2009 11:22pm EST (USA)

Check your transmission fluid which is usually done with the engine warm and running!
If the tran fluid is low add some Lucas Trans Fluid from your local auto parts store!
The knock makes me believe your low on trans fluid!

jack

I am glad my solution provided you with happiness. A gift, no, you do not need to do that. I appreciate the thought, though. The graciousness of a "FixYa" rating regarding my helpfulness would be GREATLY appreciated. That I all that I need form you. A happy Client. THAT is what FixYa is ALL ABOUT. Have a great week. Thanks again.

Is this car a six or eight cylinder?
If the car has a kickdown cable check the adjustment.