Question about 1998 Lexus Gs 400

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Lexus gs400/1998 i am having tranny problems due to thr tiptronic shifter, is there a way to reboot the transmission computer? please reply,matty

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Yeah, get the old lady out and push. (Smile)

Posted on Dec 07, 2008


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I have a lexus is 250 with a tiptronic auto box when im coming downhill the car is hunting/jerking and never done it before.the gearbox is smooth but when you drive on the highway for a long time and

read the owners manual on the operation of a tiptronic box. It will probably state that the manual selection of the box is for keeping the gear box in set gears to prevent unnecessary gear changing. So when going down hill select a gear manually and that will use the engine braking capability instead of up shifting as the rpms increase
It is fun to use the tiptronic as a manual box but that is not the real purpose of the transmission design.. IT is to lock the transmission into certain gears to prevent unnecessary up and down shifting of the transmission

Jan 31, 2015 | 2007 Lexus IS 250

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I have a P0705 Transmission range sensor malfunction on a 2005 lexus. How do I fix this?

The car has a Tcm, tranny brain.
if it TCM sees , dead sensors or a slipping tranny , it tells you.

range slection means just that.
the shifter is in one gear, and the PRNL switch is fibbing.
a contra diction,
as always bad wires, and connectors.
and shifter linkage not adjusted right.
and last a bad PRNL. switch assy on the side of tranny.

the PRNL sends a binary code to the ECU.
some codes are illegal'
eg; in neutral and drive at same time,? sure.

all this and vastly more, at alldata dot com.
no affliation at all.
mitchels is same. both excellent as is the FORD FSM.

Oct 08, 2013 | 1992 Ford Mustang

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Hi, I have preveously send a problem case as follows :"I have a 2007 Kia Carens (Rondo) 2000cc with 4 speed automatic transmission, sometimes the gear stuck on 1st speed and sometimes it...


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Regarding the problem, refilling transmission fluid is only forst step in troubleshooting.

The problem is often either the shifter console, the transmission control unit (TCU computer module), or a faulty transmission box itself.

Next step in troubleshooting is doing a code scanning. An OBD II code scanning can be done at home or at any garage, but to do a complete code scanning that includes scanning of transmission control module you need a Vag Com tool. This is expensive and it is available only at the dealer place or at a VW/Kia authorized garage. Scanning is usually billed half hour labour, and it is not expensive.

I wrote an article on same problem here. Disregard the part on "stuck in park". Article was originally written for Mercedes. Things are not too different with the Kia carens tranny.

Job is carried doing in order:

  1. OBDII code scanning, then TCU scanning.Testing for fault indicated in codes if needed.
  2. Bleeding and refilling transmission fluid.
  3. Removing cover and checking shifter lever state and conditions.
  4. Checking for tranny fluid leaks in vacuum system.
  5. Testing the TPS (throttle position sensor).
  6. Checking transmission shift solenoids (in valve body), wiring and TCU operations.
  7. Checking the transaxle itself for malfunctions.
Job bill may start from one or two hours garage if you have some silly problem like faulty TPS, and if problem is spotted at start. Repair can get very expensive if you have for example a defective gearbox.



Nov 04, 2010 | Kia Rondo Cars & Trucks

1 Answer

Automatic "Tiptronic" type shifter will not go into drive (and sometimes park) when warm.

where ever any common mechanic is trying to convence you have got 2stop. make sure your car gets looked at by an audi tiptronic specialist make sure you get them to sign the actual diagnostics and the codes to match the repairs if logical but remember " tiptronic transmission" your problem it'll star with the selector assimbly

Mar 24, 2010 | 2003 Hyundai Tiburon

1 Answer

Tranny slips occasional on up shift. clunks on 4-3-2-1 downshifts

If your TT is quattro it is DSG, if it is FWD then it is Tiptronic.. A battery change usually requires a trip to the dealer to hook up the scan tool and program the TCU for the transmission...
And yes a lower voltage can affect the sensitive electronics in this car..

Aug 28, 2009 | 2002 Audi A4

1 Answer

2006 Jetta TDI Tiptronic Maintenance

The tiptronic is not the DSG - two separate transmissions. You don't need to service the tiptronic every 40k like you do the DSG.
VW considers the fluid in a Tiptronic tranny as "lifetime" fluid - it doesn't need to be changed.

Jul 09, 2009 | 2006 Volkswagen Jetta

2 Answers

1998 volkswagen passat 160,000 mi 4cyl with turbo. TRANSMISSION

2.7 synthetic Mobil1 ATF oil, you need an oil pump to pump the fluid from the bottom of the transmission.

May 12, 2009 | 1998 Volkswagen Passat

1 Answer

Checkengine light is on,very slow off the line,not shifting right

I have the exact same problem. Does it hesitate of the start and then take off? I put an OBD II scanner on mine and it is saying that it is the 1st gear shift cellinoid. Cost's about $350 installed.

Dec 27, 2008 | 1998 Lexus Gs 400

1 Answer

1998 lexus gs 400

you can reset your computer by unpluggin the negative terminal on your battery for about five to ten minutes. If you have a radio make sure you have the security code

Dec 07, 2008 | 1998 Lexus Gs 400

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