C30 Clutch Pedal Switch Problems

I had similar issues on my C30. The symptoms you describe – error codes, gear selection display issues, cruise control failure and intermittent starting problems – all point towards a faulty clutch switch. The clutch switch, or clutch pedal position sensor, is a safety switch that tells the car's computer when the clutch pedal is depressed. This is needed for starting the engine and for functions like cruise control. Have you checked the wiring and plug to the switch itself?

Thanks for the quick reply! I've had a quick look at the wiring, and it seems okay visually, but I don't have a multimeter to properly test it. Where exactly is the clutch switch located? Is it easy enough to get to and inspect the plug connection properly?

Yeah, the visual check isn't always enough; the wires can be damaged inside the insulation. The clutch switch is usually located right at the top of the clutch pedal, where the pedal arm pivots. You'll probably have to get your head down in the footwell to see it clearly. If you're not comfortable doing electrical testing, it might be worth taking it to a workshop. My issue ended up being a corroded connector, and it was a pain to diagnose without the right tools.

Thanks! I appreciate the advice. I took it to a local independent workshop, and they confirmed it was indeed the clutch pedal switch and a defective cable. They quoted me 95€ including parts and labor. Picking it up tomorrow!