This can be resolved very quickly and easily by purchasing a repair kit. The old part number is 6450XZ, the new part number is 1607044080 from a Citroen or Peugeot dealer (they can both order it, my Citroen dealer had it in stock!). You will need the part number as my dealer hadn't heard of the fault (but had the part on the shelf?).
Add 0,5 additional litres of oil in the gearbox. Repeat the top-up procedure. N.B. : The level of oil is correct when the stream of oil becomes drop by drop. Refit the oil level plug ( 3) (equipped with a new seal) Tighten to 2,4 daN.m. 4.3. Check the oil level (continued) Refit the filler plug ( 2) (equipped with a new seal) Tighten to 2,4 daN.m.
A full used buyer’s guide on the Citroen C4 Picasso, covering the C4 Picasso Mk2 that was on sale between 2013 and 2022 Running gear. An array of mechanical problems can arise, includingMy 1.6 HDi Manual Gearbox has it. It works a treat. No need to apply any 'special' pressure to the pedal. I just hold the car on a slope with the footbrake, then release, and all the time it takes to move to the throttle and then find the biting point on the clutch, it holds the car. I have Lexia and Diagbox which indicates the car thinks the front N/S wheel is travelling at 255kph. They also advise a Short circuit to positive or short circuit to earth or open circuit. I suspect all the problems/warnings come from this fault. What I have done: 1. replaced brake switch (before lexia) 2. checked gearbox selector oil (before .