Missing 6th Gear
#1
Driver
Thread Starter
Missing 6th Gear
2005 LS430
145600 Miles
All of a sudden the transmission wont shift into 6th gear no matter how fast I go.
Also the 3 to 4 shift takes additional RPM'S to complete the shift when the temperature drops below 60 degrees f. Once it makes the 3 to 4 shift one time it shifts in a normal fashion until the car cools down, usually overnight.
Not leaking fluids of any type.
Ant thoughts what I might be up against?
Thanks in advance
145600 Miles
All of a sudden the transmission wont shift into 6th gear no matter how fast I go.
Also the 3 to 4 shift takes additional RPM'S to complete the shift when the temperature drops below 60 degrees f. Once it makes the 3 to 4 shift one time it shifts in a normal fashion until the car cools down, usually overnight.
Not leaking fluids of any type.
Ant thoughts what I might be up against?
Thanks in advance
#2
Lexus Champion
2005 LS430
145600 Miles
All of a sudden the transmission wont shift into 6th gear no matter how fast I go.
Also the 3 to 4 shift takes additional RPM'S to complete the shift when the temperature drops below 60 degrees f. Once it makes the 3 to 4 shift one time it shifts in a normal fashion until the car cools down, usually overnight.
Not leaking fluids of any type.
Ant thoughts what I might be up against?
Thanks in advance
145600 Miles
All of a sudden the transmission wont shift into 6th gear no matter how fast I go.
Also the 3 to 4 shift takes additional RPM'S to complete the shift when the temperature drops below 60 degrees f. Once it makes the 3 to 4 shift one time it shifts in a normal fashion until the car cools down, usually overnight.
Not leaking fluids of any type.
Ant thoughts what I might be up against?
Thanks in advance
#4
Lexus Champion
Troubleshooting without a DTC will be a bit more challenging.
The following users liked this post:
k7q (12-31-17)
#7
Lexus Champion
Thank you for the compliments, 05ls430518... Happy New Year, everyone!
Again, it's difficult to troubleshoot without a DTC. According to the behavior you described, it's also possible that the ECM has placed the transmission in Fail-Safe mode (designed to prevent further damage caused by a certain failures). That was the reason why I asked if you are getting DTC P0710, P0712, or P0713, suspecting that the ATF temperature sensor was at fault. Lexus parts are expensive and I don't want to send you down the wrong path to waste your time and money.
Again, it's difficult to troubleshoot without a DTC. According to the behavior you described, it's also possible that the ECM has placed the transmission in Fail-Safe mode (designed to prevent further damage caused by a certain failures). That was the reason why I asked if you are getting DTC P0710, P0712, or P0713, suspecting that the ATF temperature sensor was at fault. Lexus parts are expensive and I don't want to send you down the wrong path to waste your time and money.
The following 2 users liked this post by rkw77080:
GrizzlyMan (09-20-21),
propcop (01-01-18)
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#8
Driver
Thread Starter
Thanks for the updated information, hopefully a fix is insight.
I know where the water temperature sensor is located but no idea where the transmission temperature sensor is located, could you tell me where it is located?
Is there a convenient way to look up the part numbers for each of the two sensors on this site?
Also, is there a better way to purchase Lexus parts on line rather than from a Lexus dealer?
Again thank you very much for your comments!
Bob
I know where the water temperature sensor is located but no idea where the transmission temperature sensor is located, could you tell me where it is located?
Is there a convenient way to look up the part numbers for each of the two sensors on this site?
Also, is there a better way to purchase Lexus parts on line rather than from a Lexus dealer?
Again thank you very much for your comments!
Bob
Last edited by propcop; 01-01-18 at 04:18 PM. Reason: Add additional questions
#9
Lexus Champion
The following users liked this post:
GrizzlyMan (09-20-21)
#10
Driver
Thread Starter
Again thank you for the updated valuable information. I'll try the coolant sensor myself but it looks like the ATF sensor is a dealer or independent garage job.
Thanks again, great information. No where but here could this information be found!
Bob
Thanks again, great information. No where but here could this information be found!
Bob
#11
Driver School Candidate
Join Date: Nov 2019
Location: TX
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This worked for me!
I was seeing this same problem with my 2006 IS350 w/181k miles. It just wouldn't shift into 6th no matter what I tried. I was seeing no error codes.
After reading this message, I ordered a new ECT from Amazon, Toyota part #89422-33030.
Let me say this right now: Replacing this one innocuous part was pain. The ECT was in the very lower back of the engine, facing the battery. I had to remove the battery and use a combination of a video borescope and a teenage son's skinny arms to be able to find and reach it. (I would also recommend a 3/4" stubby wrench to remove it, as there is almost no room to maneuver in there.)
However, the scraped knuckles paid off! Two SOLID hours later, we had the new ECT installed and the car is now shifting into 6th perfectly. This work and a $46 part saved what was going to be at least a $500 service at the local Lexus dealership.
Thank you very much, rkw77080.
After reading this message, I ordered a new ECT from Amazon, Toyota part #89422-33030.
Let me say this right now: Replacing this one innocuous part was pain. The ECT was in the very lower back of the engine, facing the battery. I had to remove the battery and use a combination of a video borescope and a teenage son's skinny arms to be able to find and reach it. (I would also recommend a 3/4" stubby wrench to remove it, as there is almost no room to maneuver in there.)
However, the scraped knuckles paid off! Two SOLID hours later, we had the new ECT installed and the car is now shifting into 6th perfectly. This work and a $46 part saved what was going to be at least a $500 service at the local Lexus dealership.
Thank you very much, rkw77080.
The symptoms you described (difficulty shifting from 3rd-to-4th, and 5th-to-6th) seems to suggest that the engine coolant temperature (ECT) sensor is the culprit. According to the repair manual, ECT failure "could" cause a DTC to be recorded.
Troubleshooting without a DTC will be a bit more challenging.
Troubleshooting without a DTC will be a bit more challenging.
#13
Don't mean to revive an old thread but any chance you'd know the part# for oem ATF temp sensor? Having troubles finding it. Thank you
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