The vehicle was recovered with not only a flat battery but non start / gearbox fault.

Upon a global scan the only faults are:

ABS C1323 CAN communication to transmission ECU
C1326 CAN Communication to transmission ECU

Gearbox P1800 Gearbox control

The famous 3 bars are showing in the instrument cluster in place of the gear selected indicator.

I have tried to re-calibrate both clutch and gearbox motors but both failed and showed as incomplete. No obvious noise form either motor during this.

Checked power supplies, earths, CAN lines, all connections between control unit and both gearbox / clutch motors / position sensors.

Live data within gearbox control showed position of gear lever so assume this is ok.

Any 'Smart / MCC' technicians with previous experience on these that could guide me please ?

My only thoughts from here are brake lamp switches both hard wired to ABS module and show as working in live data but it has communication faults stored so are these getting into the gearbox control ???