Transmission Stuck In 3rd Is250 06 A960E P2714 P2757 P0761 Torque Converter

[jehmin]

Is250 2006 150K RWD A960E Transmission

Started with Transmission Codes after a dealer CSP of carbon cleaning. These two incidents could be completely unrelated. But then again there is evidence of other users with similar instances.

Initial problems was Torque Converter Problem / VSC which transformed into my car getting stuck in 3^rd gear and not going to the higher gears. RPM will be very high. This might be called a limp or safe mode to allow the car to drive. Codes P2757 and P0761

After much reading . I changed TCC and SLU solenoids along with a ATF filter and fluid change. Enough to get the color to change from black to something more red. Parts 35210-50010 (SL1/TCC) and 3528030050 (SLU)

After the replacement car shifted smoother and the Torque converter code went away. But still not going out of 3^rd sometimes. Code changed to

P2714 and P0761 Solenoid C stuck off

Iv checked the resistance of each solenoid and it was within the literature value of a certain Manuel or about 0.2 Ohms higher than high operating value. I thought this was ok? As the new part I got for the TCC was also 0.2 higher. I also used techstream to command each solenoid to perform. In most cases I can hear a faint sound when each is activated. Wish it has the pressure value of each solenoid ( I couldn’t find it on my version of TS)

The only other steps outside of a new transmission would be ( none of which were said to be a definitive solution)

Change transmission wire? ( how would one check this to know if its ok?)

Replace Solenoid C 3524050030

Replace SLT 3529034010

Update Calibrations for transmission ( My dealer will not offer this said it won’t do anything)

Does anyone have experience with these issues or have a solution?

[tnav]

Hey jehmin,

My 07' IS350 is doing the same thing. It will not shift past 3rd gear. 

The shop replaced a solenoid but the problem came back 3 months later. 

Have you found a solution? Any info helps. Thank you.

[Motorbreath]

I have an 06 gs300. Lots of research reveals pcm problems very common causing shift problems. There are many companies that rebuild , see Ebay listings. Mine starts blowing through shifts quickly when warmed up. Ive soldered on the pcm. I may send it out. It is shifting better after resoldering the trans circuits , resistors in the pcm. Still not right though.