Transmission The transmission went out at 98 K miles. Had it rebuilt at Aamco ( mistake ). Went out again, 900 miles from home and the Aamco dealer that I had it towed to has rebuilt the transmisson 3 times and each time it goes out after about 40 miles of driving. Will not go forward in any gear but Reverse workes fine. Can the problem have anything to do with the computer module?

SOURCE: Transmission on my 1999 ES 300.

If there were problems on 1999 ES300 transmissions, were the costs to fix or replace the transmissions reimbursed by Lexus?

SOURCE: Check engine light is on

no such thing as a catalytic computer... there is a catalytic converter ... part of the exhaust system so they may now be "guessing" that it's an O2 sensor. take the car to autozone... they will scan the codes for free.... post the codes here tho the lads and lasses there are pretty clever and will probably tell you what the codes mean.

Mike Vincent

• 358 Answers
• Posted on Jun 25, 2009

SOURCE: Slow Shifting Transmission When Cold

thats is normal for almost all the toyota's
the trans has to get to operating temp before it starts to shift normal.

SOURCE: Hesitation in Transmission Shift

The ES built form May to August 2006 had a faulty valve in the transmission. Lexus voluntarily replaced over 700 transmissions as good will while seeking out the problem.
Once discovered the valve was replaced in production beginning August 2007. Your production date is on the drivers door pillar. Later models were fine however some transmissions have been reprogrammed to adjust for a shift issue. My Sienna , lags and then shifts late and hard sometimes upon acceleration from a stop. Similar transmission, same fix is available. Remember that a problem they can't replicate is always tough to fix, but if this sounds like the same shift problem, ask then to keep the car overnight, you'll get a loaner and they can try it cold. The transmission can be reprogrammed again... Lexus can and will help../.It is in their MOTTO,``we can, we will..."The relentless persuit of perfection.
Post back with an update and your production date

SOURCE: 1995 lexus es300. Transmission has

P0753 Shift Solenoid "A" Electrical Malfunction (Shift Solenoid Valve No.1)
P0758 Shift Solenoid "B" Electrical Malfunction (Shift Solenoid Valve No.2)
P0763 Shift Solenoid "C" Electrical Malfunction (Shift Solenoid Valve No.3) ------------
You should first check the linkage from the tranny to the gear shift lever. Then have the computer scanned for codes. There are too many possible causes to guess. As per the error codes which you mentioned its Transmission problem. P0753, P0758, and P0773.check the transmission harness that goes into the trans and also check the valve body harness you will need to remove transmission pan for this. The first code is about gear ratios.The gear ratio fault is more then likely triggered by the solenoid issues. You need to make sure they did not damage the outside transmission harness that is located on the top of the transmission housing make sure this is ok because most of your faults are electrical faults.--------- And for shift solenoid.All the shift solenoid are internally connected/ related to each other, when one goes bad,other also get affected.Check the wire going to solenoid.-------- Also there is speed sensor. The speed sensor located on the outside of the transmission.Remove that sensor, clean that sensor and refit it.---------- The other thing that affects O/D is temperature of the coolant. If the thermostat sticks open or the system is not above a predetermined temp it will not allow O/D either.Coolant temp sensor not reading correctly reading colder than is ,or the thermostat has been removed and not replaced with a new one
or the thermostat is stuck open If the transmission system does nor read the correct temp it will not change into O/D.------ As per the error codes it indicates transmission solenoid and transmission issue.
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