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C4 - DS4 Owners :: Forums :: C4 2011 (B7) DS4 and DS4 CROSSBACK :: Problems and issues
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2012 C4 (B7) - Start and stop errors
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Author Post
Jeffinoz   
Thu Feb 20 2025, 07:52pm
Member No: #29122
Joined: Jan 28 2013
Location: Australia
 Hi,

Hoping someone here can give me some advice. I have been trying to identify the source of the errors (U1133,U1134,U1400) without success so far. I have found and fixed a couple of things that I didn't even know were an issue. My wife wants to continue using the car as everything else, other than the air conditioning, works and it runs fine. She doesn't care if the start/stop works or not.

Is there anyway I can get the a/c to work while the is an error on the start/stop.

TIA
neilp   
Mon Feb 24 2025, 04:34am
Member No: #3384
Joined: Apr 21 2008
Location: Bulwell, Nottingham
 I'm not sure those errors are PSA errors. (Citroen/DS)
What are you using to get those errors. The best to give the correct detail is Diagbox which is what the dealers use.
Are these codes from a dealer or another source.

Do you know anyone local to you that has a Diagbox setup?
Jeffinoz   
Mon Feb 24 2025, 11:55pm
Member No: #29122
Joined: Jan 28 2013
Location: Australia
 They are PSA error codes read using Topdon scanner. No Citroen dealers around here.

I don't know anyone local with Diagbox or Lexia.
Ap0qalypto   
Tue Feb 25 2025, 01:01am
Member No: #52161
Joined: Sep 21 2018
Location: Republic of Serbia
 Someone else had the same issue, it was due to fuse being blown even though it looked good.
Another thread

If you are getting U1133, U1134 and U1400 without other fault codes, then you disconnect the black 5-track connector from the reversible alternator.

If fault code U1134 has disappeared, then the reversible alternator has to be replaced. If U1134 reappears then you go back and check the connections and also the state of the connectors for faulty, bent or missing
Ap0qalypto   
Tue Feb 25 2025, 01:03am
Member No: #52161
Joined: Sep 21 2018
Location: Republic of Serbia
 Fairly common issue judging by the number of topic on the Google
Jeffinoz   
Wed Feb 26 2025, 06:32pm
Member No: #29122
Joined: Jan 28 2013
Location: Australia
 Yes, plenty of chatter on the web but no consistency in the solutions. Seems like any number of issues can take down the LIN bus and cause the error. I'll try your suggestion and do the disconnect and let you know how I go.
I am also trying to beg/borrow an oscilloscope to have a better look, but no go so far.
Jeffinoz   
Thu Feb 27 2025, 06:09pm
Member No: #29122
Joined: Jan 28 2013
Location: Australia
 Update:

With the connector unplugged the existing faults disappear and is replaced with the old P1A9C code. I have previously pulled out and checked the voltage accumulator and can't see any issues.

Still looking for where the air con gets disabled. Only happens at speeds around 60kph and over.
 

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