Citroen C4 multiple electrical issues

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bigtone0777
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Joined: 13 Sep 2013, 17:32
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Citroen C4 multiple electrical issues

Post by bigtone0777 »

Hi all, I'm having several intermittent faults with my 2007 C4 Picasso 1.6 HDi.

1) Handbrake faulty
2) ESP/ASR fault (which I presume is linked to the handbrake issue)

Both of these correct themselves if I turn off the ignition and start the car again but return, sometimes very quickly sometimes I can drive for quite a while before they return.

3) RF unit for the remote locking seems to be dead

4) Cruise control wont set (permanent fault)

5) Radiator fan doesn't engage before engine too hot warning although can turn it on in Lexia

6) P0409

7) P0489

8) P1162

All the codes seem to point to low voltage to the EGR.

I have stripped back the harness which runs from the fuse box, along the side of the engine to where it disappears around the back hoping that it would be a corroded wire like a Youtube video I've seen but it all looks good unless it's further round where I can't get to without almost taking the engine out lol
There is a "power distribution board" on top of the battery that looks a bit corroded and a sign of an old repair to one wire so I'm going to check the repair and clean up all of the contacts to that board and the fuses.

Could these faults all be linked to a singe power issue?


Thanks for taking the time to read through this ramble!

Links to pics below:

drive.google.com/file/d/1GpF5LSFpWXaK_LHScQFZJhCesT2DfAxu/view?usp=sharing


drive.google.com/file/d/1GkMCSO9phHZ7nMA4zIuaUZ-QWpNf4Ouk/view?usp=sharing


drive.google.com/file/d/1GibX72g3maf--yc_p_ZyxsUYi0iXfeIV/view?usp=sharing

Hell Razor5543
NOT Alistair or Simon
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Re: Citroen C4 multiple electrical issues

Post by Hell Razor5543 »

How old is the battery? Modern Citroens are very sensitive electronically, and a weak/failing battery can throw up all sorts of weird errors.
Last edited by Hell Razor5543 on 21 May 2020, 20:24, edited 1 time in total.

bigtone0777
Posts: 30
Joined: 13 Sep 2013, 17:32
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Re: Citroen C4 multiple electrical issues

Post by bigtone0777 »

Hell Razor5543 wrote:
21 May 2020, 14:28
How old is the battery? Citroens are very sensitive electronically, and a weak/failing battery can throw up all sorts of weird errors.
To be honest I don't know, I've only owned the car for 3 months but the battery does seem very strong

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Fake Concern
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Re: Citroen C4 multiple electrical issues

Post by Fake Concern »

As Hell Razor above says, Citroens and in particular the C4 is very sensitive to battery condition, so it's a good guess. Also have a search on the http://c4owners.org forum and also the Facebook group Citroen C4UK

bigtone0777
Posts: 30
Joined: 13 Sep 2013, 17:32
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Re: Citroen C4 multiple electrical issues

Post by bigtone0777 »

Fake Concern wrote:
21 May 2020, 20:18
As Hell Razor above says, Citroens and in particular the C4 is very sensitive to battery condition, so it's a good guess. Also have a search on the http://c4owners.org forum and also the Facebook group Citroen C4UK
Thanks for the links. Hopefully the corrosion on the connections of those main fuses will have been the cause of the issue but if it continues I'll have the battery checked or replaced.

I was hoping the corrosion was causing enough resistance to cause enough voltage drop to upset the ECU's, that's the theory anyway. Either way I'll report back and hopefully it will help someone else out.

Hell Razor5543
NOT Alistair or Simon
Posts: 10224
Joined: 01 Apr 2012, 09:47
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Re: Citroen C4 multiple electrical issues

Post by Hell Razor5543 »

I would also consider doing a BSi reset. What this will do is to shut down all of the ECUs (NOT put them into standby, as will happen when you turn off the ignition and lock the car), and will help eliminate any glitches (REAL problems won't be cleared).

https://www.frenchcarforum.co.uk/forum/ ... 51&t=61997

bigtone0777
Posts: 30
Joined: 13 Sep 2013, 17:32
x 5

Re: Citroen C4 multiple electrical issues

Post by bigtone0777 »

Hell Razor5543 wrote:
21 May 2020, 20:48
I would also consider doing a BSi reset. What this will do is to shut down all of the ECUs (NOT put them into standby, as will happen when you turn off the ignition and lock the car), and will help eliminate any glitches (REAL problems won't be cleared).

https://www.frenchcarforum.co.uk/forum/ ... 51&t=61997
I can't believe I didn't think of trying that, should have been the first thing I done! Thanks!