Fitted cruise control to my friends octavia today 1.8T Mk1 2005. All genuine wiring, bought from ebay.

Actived it with VCDS. But it comes back with 17977 Implausible Signal

Gone to measuring block 66.

Checked opperation of stalk. Working okay. correct 0 turning to 1's as each button pressed.

Brake and clutch switches working okay, according to measuring block 66-2

Did notice that once fault codes clear, activate cruise control

mb66-4 reads 00000001

mb66-2 reads 00001000

Press 'SET' on cc

mb66-4 reads 00000101

mb66-2 reads 00001000

Press 'RES' on cc

mb66-4 reads 00001001

mb66-2 reads 11001000

At this point the fault code comes in!

Have I connected up a cable wrongly somewhere? Forgotten to do something? Or is it broken?

Thanks guys

What changes when brake and clutch are activated?

Wiring wise it's only the connections to the ecu and an ignition live.

It must be coded as its picking up the switch.