P13C2 Voltage Retaining Device short to ground

[Olli_tr]

I've got a permanent P13C2 error on my 3008. Does anyone have more description of this fault code and ideas on where to troubleshoot first?

[Arkis]

If I am not mistaken it's start/stop capacitor fault. Check fuses and wires to start stop system. First check the fuses. About wires, there is one wire coming from negative terminal on the battery. That sometimes is broken while changing the battery and check wires coming to the capacitor for the start/stop system.

If start/stop is working, then ignore my post.

[Olli_tr]

Thanks! You're absolutely right, it's related to start/stop and it's not working. My 3008 has the start/stop with reinforced starter and not the start/stop with reversible alternator (that much I learned from looking at servicebox), ie. it does not have an ultracapacitor, just the voltage maintaining device that has the task of keeping the voltage at a correct level.

Based on the wiring diagrams on the negative terminal of the battery there's indeed something called Battery Charge Status Unit that has a grey wire coming to pin 4 of the 6-way connector on the voltage retaining device. I'll inspect that more carefully!

[Chrille]

Hi both Olli & Arkis,
your posts are the closest I have ever seen regarding the fault on my Berlingo 1.6 BlueHDi 120 from 2016, with obviously same or similar engine as yours. I can see this P13C2 error code 'short to ground' together with start-stop disabled. As the vehicle is otherwise working perfectly, and there is obviously no hard 'short to ground', I thought I could point that down to falsely measuring some current while starting up the engine, as I can reset the fault (without fixing the start-stop) .. but P13C2 comes back at the next start. Your discussion may limit that down to the component to be replaced.

I would be interested if Olli fixed the fault in the way indicated. Plus: where did you get a wiring diagram, and maybe a picture where that capacitor sits?

[Chrille]

I have measured the battery voltage with an oscilloscope. It turns out that upon starting the voltage drops by about 5 V to about 7.5 V, but recovers quickly to 10 V in about 50 ms, and to nominal voltage in a bit more time (see picture). I have read that voltages below 8 V are considered short circuits by some control device. Does any one have experience with that? A defective start-stop-capacitor might by the cause, but I wonder why such a short duration of under-voltage should be such a problem.

[Chrille]

Here comes the picture