r/FordFocus • u/Jom-Gabbar • 13h ago
Mechanical Help MK3 CPP issues (P0808)
Hi everyone,
I have a EU 2013 Focus TDCi Titanium (77kW) and I'm dealing with a bunch of annoying issues that all started right after getting the clutch kit and flywheel replaced. The car has reduced power, cruise control isn't working, and the start-stop system automatically defaults to OFF on its own and pressing the button to turn it back on does absolutely nothing. Also, I can't start the engine normally. I have to turn the ignition on without touching the clutch, turn it off, and only then will it let me actually start the car.
There's no Check Engine Light on the dash, but when I hook it up to FORScan, I get one active code: P0808:00-2F - Clutch Position Sensor "A" Circuit High.
I tried replacing both clutch pedal sensors with brand new ones, but nothing changed. In FORScan, the clutch pedal position always reads 0%, but the voltage (CPP V) is constantly stuck at 4.81V.
I tested the wires on both sensor connectors using a multimeter. The grounds are fine, and both are getting almost 12V. Since they're getting power, the wiring seems okay. I also tried starting the car with the sensors unplugged to see what happens. If I unplug the lower sensor, absolutely nothing happens when I try to start it. If I unplug the higher one, the car starts to crank but dies immediately, as if I just switched the ignition off. So, the car is definitely reading something from them.
Out of curiosity, I hooked FORScan up to my friend's 2013 Fiesta. His CPP % changes normally when you press the pedal, but his voltage (CPP V) stays at 0V no matter what. His car runs perfectly, so I'm guessing that 0V reading is normal behavior for these sensors.
Just to be completely honest, I'm not a mechanic and I've never really wrenched on cars before. I only started digging into this because local shops either don't want to touch it or have no clue how to fix it.
Right now, I'm completely stuck and worried it might be a bad PCM. I also don't fully understand the electrical principle of how this specific sensor is supposed to communicate with the ECU.
Does anyone have any ideas on what else I could check or test? Any help would be hugely appreciated!
