C4 B7 e-HDI U1133 U1134 LIN Network Problems [Solved]

[pablo95]

Hello everyone
c4 2014 model 1.6 ehdi 115 exclusive semi-auto 65k miles.
SERVICE light on and the start stop system didn't work, The car was running fine no problems just a service light.

The fault codes are U1133, U1134
Went to Citroen dealership in my town and they couldn't tell me what's the problem was, they told me to visit a Bosch Car Service instead couse they have 'better tools'. I was really disappointed, so I decided to visit Citroen dealership of the nearest city.
After 3 hours of checking the car there,they told me it's the start stop system and its needs replacement. total cost 1005€ parts 200€ labor.
bought a used one and went to them to fit it.

after fitting it, the car still have this fault codes and still have the SERVICE light. They asked to leave the car there for more research.
I'm really exhausted and disappointed. I have the car 1 month and want to fix it (somehow) and sell it or to put it on fire . it drains all my energy.

Thank you for your time and I appreciate your help.

VIN is VF7**************[VIN obfuscated, can be read by forum staff] in case of needed.

[pablo95]

Solved. it was a fuse on the engine bay.
the fuse was OK if you looked at it but the fuse inside had corrosion. changed fuses, everything works
the diagnose costed 100€

[Paul-R]

Glad that it's sorted for you. Is there any chance of your money back for the S/H parts that you needlessly bought?

Was it the same Citroen dealer that finally found the faulty fuse?

[pablo95]

Glad that it's sorted for you. Is there any chance of your money back for the S/H parts that you needlessly bought?

Was it the same Citroen dealer that finally found the faulty fuse?

yes, It was the same dealership,
I will try to sell it again

[thangviet]

Hi Pablo95,

I have the exact problem on my Peugeot 508 1.6 e-HDI model.
Do you recall which actual fuse was the problem?
Was it the fuse box on top of the battery OR the main engine one?

[pablo95]

Hello it was a fuse on the main engine one, I don't remember which one exactly but your fusebox could be a little bit different too, just check all the fuses on there! Keep in mind that the fuse can have 12v but not resistance ( the dealership told me something like that )