check powertrain and svs warning light stays on,,,,and no speedo

i have vz 04 model,,last week i had a problem starts, when i turn the ignition on,,after system checking status ,,,the message blinks check power train and service vehicle soon,,,both messages,,staying on ,,,and not gone off,,and when i put in drive,,,or in other gears the speedo is also not working ,,,other stuff on dashboard is working fine

but i have no problem while driving,,it shifts the gears,,,going easily on 80-100km/h ,,,looks like nothin wrong with trans,,,aftr scan the problem with ultrascan tool i have this code,

U0101 CAN-BUS NO COMM WITH TCM,,,,,,,,, AND the description of this code is that it has lost communication with TCM,,,, nad i tried many times to erase this code but not,,,its stays there,

did anyone have idea to how to go through with all this,,and wht the possible cause,,,,transmission or the fkin TCM where is this TCM ( i think tcm means transmission cntrl module) but where the *** is tht,,on car,,

any idea,,,bout it,,,waiting for replies
thnks

 

i had disconnect the battery for a night and also disconnect the computer plug near the throttle body for up to long hours,,nothig could change,,,,,and i have have not touched the instrument cluster at all,,,,,because on my car theres no traction control system,,,,,,so it means the fault is other,,,today i had rang in logicar,,, for help on this,,they told me the fault sholud be in,,,,3 things 1)ecu 2)firewall 3)keyready.... nw i have to remove these parts and send then for checking,,,,which one is faulty ,,,lets see hw it goes

 

sorry dear i not chked battery voltage yet,,,i will try,,,,bye