With the key in the "Radio" position (Radio and OBC light up, but not the instrument cluster), press the "CODE" button. Then push the little reset-hole with a Pen and hold it, 'till the computer blinks in the display, and it will ask you for a time and date entry. - You now have re-adapted the coding plug to the computer. - Normally the computer goes into a PPPP mode when the car has been boosted, or some other very drastically voltage changes have occurred.
Give it a try and let us know if it works. If not, Gogle it and there are several threads on it.
It may be an internal fault with the OBC unit itself. Try swapping it out with a known working one.
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