I had a C8 fault the other day. for anyone looking to save a pointless call out charge try the following:

check wires leading to accelerator pedal in front of truck for loose connection/water. Very easy to do, simply lift forks high out of the way and you'll have access to wires between tyres.

a combination of cleaning and hair drying this area resulted in truck working again!

would it be possible to forward me a list of the fault codes too please?
thanks