04 LS430 won’t shift past 3rd gear. Anyone else?
04-19-20, 10:38 PM
#16
I will order that software and see what I can figure out. I did notice that the heat was not coming on after the car was completely warmed up so it could have a bad thermostat, which might be causing a problem. Im going to swap it out tomorrow and make sure the coolant level is correct.
04-28-20, 10:43 AM
#19
The weird thing is that it doesn’t happen everyday. No consistency. It happens basically every other day and I never got another code. I just shut off the car, turn it back on and it’s perfectly fine.
Not sure if I mentioned but I had a drain and refill done at Toyota to make sure the level was fine. The car did not repeat the issue for the tech.
05-20-20, 12:08 PM
#21
LexusDog, and progress on a solution? Or hopefully the fluid change was the remedy. As I stated, I had the tranny rebuilt when this occurred. So few posts about this issue suggests pretty bulletproof trannys on these LS 430s...
05-21-20, 11:42 AM
#22
It was nice of Sia to tell me that the ECM is most likely the problem.
Is your car a 2004 with the six speed transmission? And was it doing the same thing where it wouldn’t shift into fourth gear until you stopped and shut it off and turned it back on? Also what was the charge for the rebuild? Thank you for your feedback, it is tremendously appreciated.
05-22-20, 09:10 PM
#23
Hey, I sent the computer to SIA electronics and they supposedly rebuilt the transmission circuitry. Got it back today and put it in, and the same problem occurs.
It was nice of Sia to tell me that the ECM is most likely the problem.
Is your car a 2004 with the six speed transmission? And was it doing the same thing where it wouldn’t shift into fourth gear until you stopped and shut it off and turned it back on? Also what was the charge for the rebuild? Thank you for your feedback, it is tremendously appreciated.
It was nice of Sia to tell me that the ECM is most likely the problem.
Is your car a 2004 with the six speed transmission? And was it doing the same thing where it wouldn’t shift into fourth gear until you stopped and shut it off and turned it back on? Also what was the charge for the rebuild? Thank you for your feedback, it is tremendously appreciated.
The following users liked this post:
bradland (05-25-20)
05-29-20, 09:02 AM
#26
Thank you for the circuit matrix. I had the ECM redone by SIA electronics and I also replaced the engine coolant temp sensor. I didn't replace it with a Toyota specific part and I do question if that could be an issue. As far as the shift solenoid, I do not have the space or time to be messing with that. From my extensive research on this subject, It seems that replacing all of the shift solenoids, the spider harness, and getting the fluid perfect doesn't always fix this issue. So instead of wasting time and money trying to replace parts, I will be replacing the transmission with a rebuilt or used unit.
One other thing that I would like to note for others that are having this issue, this is a very intermittent issue that doesn't happen everyday. What I have noticed is that if I drive it like an old man it tends to have the shifting issue first thing in the morning. If I drive it with more than 30% throttle, it seems to shift like a champ. Its almost like the car is saying to me, feed me some speed and I will do what you want. Lol
One other thing that I would like to note for others that are having this issue, this is a very intermittent issue that doesn't happen everyday. What I have noticed is that if I drive it like an old man it tends to have the shifting issue first thing in the morning. If I drive it with more than 30% throttle, it seems to shift like a champ. Its almost like the car is saying to me, feed me some speed and I will do what you want. Lol
05-19-23, 03:47 PM
#27
2005 LS430 will not shift put of 3rd gear.
I recently purchased an 04 LS430 and I’ve had this happen to me on two occasions. When I start the car up in the morning in warm climate and drive it, it will go into some sort of safe mode and will not shift past third gear. I have tried to shift it manually through the gate but it still will not shift. If I come to a stoplight and shut it off and turn it back on it is perfectly fine.
To me this seems like something electronically because it will go a few hundred miles before the problem reoccurs. Not something that would be low fluid in my opinion. Anyone else have this issue? I searched but didn't find very much. Any help would be appreciated. Thanks
To me this seems like something electronically because it will go a few hundred miles before the problem reoccurs. Not something that would be low fluid in my opinion. Anyone else have this issue? I searched but didn't find very much. Any help would be appreciated. Thanks
I already drain and fill trans fluid. Changed filter. Fluid was not dark. Replaced the shift solenoid (S3). I sent out my ecu/tcm out to SIA electronics. They said they rebuilt the whole transmission circuit. It did fix the hard downshift I had when slowing down from 2nd to 1st but it still dosent shift out of 3rd. I tried the resetting by put key in turn to ON position and hold accelerator pedal down for 5 seconds. Key off and release pedal and wait 2 minutes. Did kot do anything. I disconnected battery for 30 mins and try again and nothing. I checked resistance on the ecu connector for solenoid s3 so I can check the wire all the way to the ECM. It's good 14 ohms resistance. Idk what else to do.
05-20-23, 04:53 PM
#28
https://www.clublexus.com/forums/ls-...ttle-body.html
Try cleaning the air mix passages pointed out and discussed in this post. The issue with the transmission holding gears too long and rough shifting are sometimes found in the 1st and 2nd generation LS with the 4.0 L V8.
Try cleaning the air mix passages pointed out and discussed in this post. The issue with the transmission holding gears too long and rough shifting are sometimes found in the 1st and 2nd generation LS with the 4.0 L V8.
Thread
Thread Starter
Forum
Replies
Last Post