When you get your problem are most of the electrics such as lights, windows radio working. If so the problem may be in the BSM (engine fuse box). The BSM is not a simple fuse box it has a lot electronics and relays. If you are losing power to only a few things e.g. starter motor solenoid and folding mirrors it can be due to a fault in the BSM.

P0401 - EGR Flow Insufficient - remove and clean the valve and all the pipes to/from it at both ends. P0002 - Fuel Volume Regulator Control Circuit. P1163 - This code cannot be relied on unless it is connected to either a Bosch diagnostic tool or Citroen's Lexia/Diagbox. It has too many meanings.

Damaged solenoids – the opposite problem of your vehicle’s starter not stopping, is a failure to start. If the solenoid is working correctly, you should hear a click coming from the part. If there’s no sound, it is probably broken. Intermittent problems starting the engine – sometimes the engine starts easily.
This will create a small explosion which will allow to start the engine of your Citroen C4 Picasso. Therefore, the problem of hard starting can be triggered by a problem with the ignition, battery, starter, spark plugs, injector or even alternator. 1. 2-Starting circuit for Citroen C4 Picasso diesel
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citroen picasso starter motor problems