GS430 factory tranny goes out at 27K miles, replaced by dealer under warranty. Second tranny goes out at 45K, replaced by dealer under warranty. Third tranny goes out just now at 85K, no warranty ..
I went to the dealer, an independent Lexus mechanic, and a transmission shop, all with same answer - these trannies never go out, we don't know why yours keep failing, but yes, it needs a new one, so it'll be $3500 to replace.
Being stubborn (and not willing to spend $3500 at this point), I started obsessing and trying to understand why they keep failing so quickly, if no one else is seeing this problem.
I decided that the problem must not be the tranny, but the interface with the car - cooler, ECU, wiring, etc. So I checked the cooler (good flow) and wiggled the connectors, oh, and replaced the battery, because it was dying.
And guess what? The problem is gone!!!!!! Tranny works like a champ. At first I thought it was the connectors, but then I looked at the paperwork, and here is what I saw - when the original owner complained of tranny problems, he also complained of poor starting, so the dealer replaced both the tranny and the battery. The second time, the battery was also getting old, and needed to be replaced within three months of the tranny being replaced. And same this time around, the battery was again on its way out when the tranny started acting up. See the pattern? Old battery - tranny problems; new battery - no tranny problems.
I would have never believed this to be possible, until I did some googling of this phenomenon, and it is all over the place:
Anyway, just want to spread the word that if you see this happen to you, check the battery before spending the $3500... I am going to throw myself a party with the money I saved!
Glad you found the problem, and thanks for sharing the info. I think I read somewhere in the Club Lexus bylaws where if the value of the party exceeds $2K, we are all supposed to be invited because the grub has to be hella good. Let us know, and we'll make it the first party in your neighborhood that needs valets. Hah!!
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great find. so let me get this straight, if you don't have enough of a power source (battery) then you ecu does not have the capabilities to run efectivly? i read both of your diy threads but am still alittle confused as to why and how this effects the transsmition? could you maybe go into alittle more detail please.
'02 GS Onyx Black with Beige Inside...
Eagel Eyes, 6000K HID Projector lights for the head lights and 6000K HID for the High Beam... and matching 6000K HID for the Fog Lamps
3rd Gen GS Rims 18"
All interior bulbs changed to white LED that match the HIDs and the Angel Eyes
more to come
I love this stuff!! I fixed my faulty gs300 tranny by bending a connector back on a solenoid. Dealer wanted "at least $AUD5000" to fix that one...
Thanks, and just so you know, it was in fact your post from about a year ago about the shift solenoid connection that made me start thinking that my problem was electonics-related, rather than mechanical. So thanks for posting that back then, as you can see it helped a fellow CL member - me! .