Jumps out of gear and "Gearbox Malfunction" appears on dash. Sometimes works for a little while before this happens.

Scanned with VCDS and I am getting 20888 - Pressure Control Solenoid 1 - P0748 error.

I have replaced the ATF, motor, filters and all the solenoids. 

Does anyone have any experience with these.. could the TCU be faulty or is there another hardware element within the ATU which could be at fault. 

-- VCDS OUTPUT --
 

                Address 02: Auto Trans       Labels: 0CJ-927-156.clb
Control Module Part Number: 4G0 927 153 L    HW: 0CK 927 156 Q
  Component and/or Version: 0CK 20TDI RdW H01 0002
           Software Coding: 100001
            Work Shop Code: WSC 02391 785 00200
              ASAM Dataset: EV_TCMDL382021 002014 (AU57)
                       ROD: EV_TCMDL382021_AU57.rod
                      VCID: 323AC2AFE4A6AE7A99F-8066
1 Fault Found:

20888 - Pressure Control Solenoid 1 
          P0748 00 [10101111] - Electrical Malfunction
          MIL ON - Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Priority: 1
                    Fault Frequency: 8
                    Mileage: 332432 km
                    Date: 2000.00.00
                    Time: 00:00:00

                    Engine RPM: 0 /min
                    Driving position: d
                    ATF temperature: 14 ∞C
                    Transmission output speed: 0 /min
                    Voltage terminal 30: 12.7 V
                    Engine torque: 0 Nm
                    selected gear: N
                    Ctrl. mod.: operating condition: regular operation
                    Auxiliary pump for transmission: requesting function: Fill hydraulic press. accum.
                    Auxiliary hydraulic pump for transmission oil: current: 4 A
                    Oil pressure reservoir: pressure: 0.7 bar
                    Pressure of clutch 1: actual value: 0.0 bar
                    Pressure of clutch 2: actual value: 0.0 bar
                    Clutch status: New
                    Unlearning counter according OBD: 40
                    Occurrence_counter_over_length_of_life: 206

 

-- 

Thanks!!

 

Id definitely say it could be the megatronics unit. You could send this off to be tested. 

Thanks for the response, know of any good businesses to send one off to?

Thanks!