po963 trans mission control system

Question

my obd shows po 963// po70. 0 .mytrans flud is ful clean ,startit up put in drive 20 feet laterit pops like out of gear.it still drives but no shift,if drop down in firstaccel is good up to 35mph and shift and it slowly get to 80 mph .but it will not shift,i can start it up ,drive it 20 feet pop out shut off,start up and do ..the same thing over and over ..these are the only codes that come up on obd,,Iv shanged this cvt trans 3 times ...thay all do the same..is this elec//troble brain no one will tell me from trans shops ,,need helpcan someone please tell me how to fix this

Answer 1

P0963 Line pressure control solenoid circuit high

The line pressure solenoid is part of the valve body. when its circuit high this is usually a disconnection. Being a PWM solenoid just does not work and don't work. What the TCM (Transmission control module) does is turn off the line pressure solenoid, and durnig a shift or at a shift the TCM pulse width modulate the solenoid.in doing so there is no harsh shift. But in your case there is a harsh shift.Once P0963 appears the transmission goes into protection mode. My feeling as what this is doing is more a electrical problem, by your description. When driving the vehicle note the behavior of the speedometer if it flucuate at highway speed or acts erratic it affect the line pressure solenoid the output speed sensor informs the TCM and determines line pressure if the speedometer is acting up the problems in the valve body.