U0101: Lost Communication with TCM on ISF

[AUISF33]

Hi,

U0101 Code: Lost Communication with TCM

Has anyone come across the above fault on an ISF? I tried a couple things as well as having Lexus look at it. They recommend I bring it to an auto electrician.
There are two scenarios: 1. I get three lights (engine/traction/abs) which makes the car go into limp mode or 2. I clear it (sometimes it doesn't) or the third light (abs) goes away and the car drives normal and through all gears etc

I've not worked on the car besides usual maintenance of changing the engine oil. Battery + connections good, only 2-3 years old

Car is a 2011

Cheers
 

[AUISF33]

Some more info:

• Battery Voltage with engine off = ~12.7
•  
• Control module voltage = 13.828V
•  
• Oxygen Sensor Output voltage (B2-S2)= 0.155V <------is this something to be worried about?
• Oxygen Sensor Output voltage (B1-S2)= 0.855V
•  
• Oxygen Sensor voltage (B1-S1)= 3.246V
• Oxygen Sensor voltage (B2-S1)= 3.241V
•  
• Oxygen Sensor Current (B1-S1)= -0.02mA
• Oxygen Sensor Current (B2-S1)= -0.03mA
•  
• It fault codes seems to only appear for : ECU (#e8) = U0101 Lost Communication with TCM 1/2 & 2/2
• No faults for ECU 2 (#e9)

[ilv1004s]

sounds like transmission ecu
or tcm fuse

check those

[AUISF33]

 

Do you happen to know where i can locate the fuse for the TCM or a wiring diagram TCM-ECU? 

The only fuse box as per the fuse diagram that I can see relates to the transmission is the one below (15) which is located on the right side drivers side (AUS) panel. It's 7.5amps and looks to be good and not broken.