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C4 - DS4 Owners :: Forums :: Citroen C4 Picasso and Grand C4 Picasso (B78) 2013 onward :: C4 Picasso and Grand C4 Picasso (B78) Problems and Issues

Key works - sometimes

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Sat Oct 12 2019, 06:10pm
Member No: #54810
Joined: Oct 12 2019
Location: Exeter
My main key for my C4 Grand Picasso stopped working recently. It will not open or lock the car upon pressing the remote buttons, nor will it be recognised as present when I put my hand behind the door handle.

However if I unlock the car with my spare key, now the original key works perfectly.

Yet the next day it's back to not working.

I haven't run any strict tests, but the "active" time seems to be several hours.

Any ideas?
Sat Oct 12 2019, 11:42pm
Member No: #36597
Joined: Jul 23 2014
Location: Bucks
Change the Key battery it is a CR-2032 3V mine was the same the old battery was 2.92v and a New one is 3.35v hope this helps.
Sun Oct 13 2019, 11:26am
Member No: #46470
Joined: Oct 11 2016
Location: Cambridge
Agree. It's getting colder at night, battery efficiency drops off with temperature so it may work or not depending on how warm the key is. Next day=next morning perhaps? Time for a new one.

Inexpensive easy diy first step.

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