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C4 - DS4 Owners :: Forums :: C4 2011 (B7) DS4 and DS4 CROSSBACK :: Problems and issues
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Supplies Management and Protection fault - Help!
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Author Post
eg01645   
Sun Dec 25 2022, 01:27pm
Member No: #60344
Joined: Dec 24 2022
Location: England
 Hi all, got an issue with my C4 1.6 exclusive, 2012 model. For history, it's run perfect for 2 years for me and only has 32k on the clock. In October I had a new windscreen fitted due to a large chip and then the problem began. After 1 use the car came up with an Engine fault on the dash. Plugged in the diags and got the following errors:

U1F41 - Absence of Communication with the Supplies Management and protection module

B1601 - Central Power Switch relay control fault.

After various checks I found a used fuse board that sits on the battery however this hasn't fixed the issue. I've completed the usual BSI resets etc and replaced the battery, still the same fault.

The reason I mention the windscreen swap is A) the timing of the fault fits, and b) the wire from my dashcam had been pulled out of the piggyback fuse holder in the glove compartment fuse board. I've checked fuses but all seem ok. I've also unplugged the modules on the mirror and fault is still there.

I wondered if anyone had any further advise? Is there a fuse that powers something of the BPGA module in the glove complartment fuseboard?
eg01645   
Tue Dec 27 2022, 06:35am
Member No: #60344
Joined: Dec 24 2022
Location: England
 To add to this, I wondered if anyone had a wiring diagram from the plug under the PBGA unit onwards - I suspect an issue with this circuit somewhere and don't want to replace the module again uneccessarily. The car is driving perfect except for this error and everything works.
eg01645   
Wed Jan 04 2023, 04:47pm
Member No: #60344
Joined: Dec 24 2022
Location: England
 Anyone got any help with this or experienced anythimng similar?
vexorg   
Thu Jan 05 2023, 04:21am
Member No: #48843
Joined: Jul 06 2017
Location: Scotland
 Have you tried the old battery off for 10 minutes?
Are the codes persistent or can the be cleared?
Farmerguy   
Thu Jan 05 2023, 11:06am
Member No: #59597
Joined: Apr 10 2022
Location: Denmark west part
 Do you know where the bsm and ecu moduels are loate?
Maybe try taking the battery pole of the battery after it sleeps, then try to remove the connectors on the bsm and engine ecu, and look for corrosion, if nothing found just plug them in again. I had a abs module on my Saab that could not be communicated with, i just removed the connector and put it back in and the problem was gone.
Farmerguy   
Thu Jan 05 2023, 11:10am
Member No: #59597
Joined: Apr 10 2022
Location: Denmark west part
 Oh bsi might also be an issue.
Found this link - Click Here -
eg01645   
Sun Jan 08 2023, 06:14am
Member No: #60344
Joined: Dec 24 2022
Location: England
 So moved on a little with this, but not much.

I'd replaced the BPGA board (Battery fuse box) with a slightly later unit - this should have been fully compatible but just be sure sourced an exact part code one. I have the same issue still so can safely rule out the Supplied Management and Protection system (as the BPGA is called in diagbox).

Two things that may help - the car does not go in to economy mode any more. I've been sat in it for an hour this morning and not gone to sleep. Relevant as this is controlled by the BPGA/BSI unit. Also when listing control boards in diagbox it gives a "Commnunication fault" in the listing, rather than "not present".

Any pointers would be appreciated! It seems the unit is not communicating effectively with the BSI hence no economy mode.
eg01645   
Sun Jan 08 2023, 07:32am
Member No: #60344
Joined: Dec 24 2022
Location: England
 Just checked - economy mode is working ok.

Farmerguy   
Fri Jan 13 2023, 12:23pm
Member No: #59597
Joined: Apr 10 2022
Location: Denmark west part
 Did you try the connector resetting?
eg01645   
Sun Jan 22 2023, 01:22pm
Member No: #60344
Joined: Dec 24 2022
Location: England
 still struggling with this, if anyone has any ideas?!
eg01645   
Sun Jan 22 2023, 05:28pm
Member No: #60344
Joined: Dec 24 2022
Location: England
 Sorry, yes i've reseated all connectors, unplugged everything under bonnet and also behind the glovebox.
eledu   
Tue May 27 2025, 01:39am
Member No: #63055
Joined: May 14 2025
Location: Spain
eg01645 wrote ...

Sorry, yes i've reseated all connectors, unplugged everything under bonnet and also behind the glovebox.

Hello, did you solve the problem?
 

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