sensodrive will not select reverse when the engine is running (snowflake)

Hi I hope someone can help

i have a 2003 c3 pluriel sensodrive

The car will not select reverse when the engine is running and will not rev up and drive when put in any gear,and after selecting 1 it will then go into 2 and snowflake flashes.
I have now replaced and coded in with lexia ecu, gear and clutch actuator from a running and driving car so i know there good.but fault still the same.What i cant understand is why when the car is jacked up at the front it does rev up and drive in forward gears and changes ok too .But will not select reverse at all even though it shows r on the display.Could it be a wiring fault or abs fault or speed sensor somewhere??
when the engine is not running you can select reverse and hear it go in and reverse light comes on but not when the engines running it just doesnt select ,When i put it on live data and put it into forward gear it tells you whet gear its in but when in reverse it says ???? on the live data also fault code says tu engine gear not selected...any ideas please ?? Many thanks Bill

Hi Bill

bill field wrote:When i put it on live data and put it into forward gear it tells you whet gear its in but when in reverse it says ???? on the live data also fault code says tu engine gear not selected...any ideas please ??

Can you get it back on lexia and read the fault codes. Screen capture and save the error codes, interrogate the error code with lexia to see what is suggested.

bill field wrote:.Could it be a wiring fault or abs fault or speed sensor somewhere??

These should both show up as error codes in lexia.

Many thanks for the reply but no fault codes on bsi or abs system.Any more ideas please ?
Cheers
Bill

bill field wrote:go into 2 and snowflake flashes.

Should record faults for snowflake flashes.

bill field wrote:no fault codes on bsi or abs system

How about the gearbox ecu and the engine ECU.

I would just do a full system scan and see what come up with fault 'YES'

Like this one showing non communication and faults present.

Hi Done a full scan all it comes up with is 1 fault on gearbox ecu ,I cant remember the number of the code but it says tu engine.... gear not selected Thats all
many thanks
Bill

Just had a thought ,, Could it be the brake pedal switch ?????

All sorted now .It was the clutch pressure plate It has split and wasnt releasing the clutch properly

bill field wrote:Just had a thought ,, Could it be the brake pedal switch ?????

Would show up in lexia and can be tested with lexia.

bill field wrote:All sorted now .It was the clutch pressure plate It has split and wasnt releasing the clutch properly

A major mechanical fault. Thanks for the update!