Citroen c3 sensodrive issue

[Cemarshall123]

Hi all got a citroen c3 1.6 fitted with the sensodrive auto system. Car is my sisters in laws and is lovely tidy clean motor.

Issue was it started to bunny hop. Jerk and then kepted getting the auto light flashing and the snow flake.

My thinking aa clutch actuator. Did diagnostics on it with lexia and it did confirm that there was a issue with the communication.

However he issue has now developed were it jerks and wont select gears and now wont start at all.

Lexia dinostic and now it cant find the gearbox ECU.

My thinking is the gearbox ecu is the problem all along. I've checked the fuss there all good and I've cleaned all the plugs and still nothing.

Took battery off now to leave to power down and see what happens.

Anyone else come across this as I think it's the gearbox ECU?

[GiveMeABreak]

Here's the descriptor for the fault.

Fault code	P1755
After sales description of the fault code	Clutch actuator fault: Coherence
Description of the diagnostics	Position incorrect in relation to the requirement Time for appearance of the diagnosis: 1 seconds
Context of appearance of the fault code	Ignition switched on
Technical precision on the context of appearance of the fault code	Ignition switched on Check that there are no fault codes: P0600 ECU fault Output stage and power stage: Not characterised P1712: Clutch actuator position signal fault Not characterised P0608: Clutch and gear engagement actuators position sensor supply fault: Not characterised
Conditions of disappearance of the fault	-
Down-grade modes if fault present	Switch to automatic mode Sequential mode not available Delayed changing up and changing down of gears No further changedown with engine braking Attempt to disengage from the gear to neutral when stopped Deactivation of the function Stop&Start
Switching on of the warning lamp and/or warning message (*)	- Warning lamp service Flashing of warning lamp AUTO
Main customer complaints likely	Lack of power Jerking/stalling Difficult/impossible to change gear Deactivation of the vehicle speed limiter Deactivating the cruise control
Suspect areas	Clutch actuator Clutch Electrical harness (Gearbox ) Piloted manual gearbox ECU

There's another post on it here - but get your wallet out...

viewtopic.php?t=43399

[Hell Razor5543]

Hi, and to the Forum. The bad news is that the Sensodrive gearbox has a reputation (that it has earned) for being problematic and expensive to repair. It is, in effect, an manual gearbox with robotic actuators. I know of a Forum member who had a car with such a gearbox; it cost about £1,000 to get the problems sorted but he had lost all trust in the car, so he sold it. Less than a year later the person he sold it to had it up for sale as "Spares or Repairs".

[GiveMeABreak]

I realised I forgot the link in my last post: updated and here:

viewtopic.php?t=43399