Citroen C4 Grand Picasso 2015 MK2 Brake Fault

[GiveMeABreak]

Here you go:

Fault Code:	C156C 92
Description of Fault:	Electric parking brake (FSE) actuator sensors : Short circuit to positive or short circuit to earth or open circuit. Possibility 1 - Short circuit between the LH and the RH line of the motorised brake calipers - The time for recording the fault code is 120 milliseconds Possibility 2 - The line supplying the LH or the RH motorised brake caliper is in open circuit (Sensor disconnected) - The time for recording the fault code is 200 milliseconds
Conditions for Fault to clear:	Ignition on (For at least 5 seconds)
Downgrade Modes whilst Fault is active:	Checking of the motorised brake calipers : Only loose Deactivation of the "Stop and Start" function
Symptoms:	Parking brake faults
Suspect Areas:	ABS/ESP ECU Electrical harnesses Connectors

As for fault C1561 there are a few possibilities as you can see, but should help point you in the right direction.

Electric parking brake (FSE) right-hand actuator: Short circuit to positive or short circuit to earth or open circuit

Possibility 1
- The line of the RH motorised brake caliper is in short circuit to earth
- The time for recording the fault code is 15 milliseconds
Possibility 2
- The line of the RH motorised brake caliper is in short circuit to positive
- The time for recording the fault code is 15 milliseconds
Possibility 3
- The line of the RH motorised brake caliper is in open circuit
- The time for recording the fault code is 15 milliseconds
Possibility 4
- A short circuit between the lines of the RH motorised brake caliper has been detected
- The fault immediately appears
Possibility 5
- The supply line of the RH motorised brake caliper is in short circuit to earth
- The time for recording the fault code is 200 milliseconds
Possibility 6
- The supply line of the RH motorised brake caliper is in short circuit to positive
- The time for recording the fault code is 200 milliseconds
Possibility 7
- The supply line of the RH motorised brake caliper is in open circuit
- The time for recording the fault code is 200 milliseconds
Possibility 8
- During the application phase, the speed of the motorised brake caliper RH actuator is outside the range
Possibility 9
- The ESP ECU compares the speed signal from the motorised brake caliper RH actuator relative to pre-defined thresholds
- The time for recording the fault code is 200 milliseconds

[Alex watkins]

Hi iv got a fault with the parking brake on my Citroen C4 2014 that I can not work out have you got any ideas
Thanks Alex

[Greeny100]

Hi Marc thank you so much for this information!. I had a quick look today and tracked the wiring harness to its different positions, it looks very exposed and looks in fairly poor condition. I've not had chance yet to strip it apart and look properly but this is z massive help thank you!
Can I ask is this information easy for me to obtain? Or is it main dealer information only?

Hi Guys- just joined to forum to say thank you so much- i run a garage in Manchester and
this fault occured on a Picasso, we were scratching our heads for ages till we found this
Invaluable info- Exactly as explained, checked the offending wire and found it broken
BIG build up of dirt in the conduit, saved the day and my sanity

Keep up the good work and thanks

Dave

[GiveMeABreak]

Glad it helped, thanks for your comments and I'm sure the individual contributors will appreciate your sentiments.

[C4 mk2]

Hi all
I have same usues with electric hand break with same two codes and isue was wire corroded and broken near driver side rear wheel near brake discs location, it's common issue with citroën. Cost £100 to fix or you can do it yourself as i realise to late.

[Elgrande Skyblue]

Many thanks for your help and information.

We have changed both the rear handbrake actuators.
Rgds.

[CitROeNALD]

Okk so a little update, I found two corroded wires on the drivers side rear. I have soldered and heat shrieked the wires. Reset the fault codes using the code reader and re assembled.
Marc your an absolute hero for sending me in that direction! Thank you thank you thank you!

Where is that picture from exactly? I can't quite work it out.

[webs666]

Okk so a little update, I found two corroded wires on the drivers side rear. I have soldered and heat shrieked the wires. Reset the fault codes using the code reader and re assembled.
Marc your an absolute hero for sending me in that direction! Thank you thank you thank you!

Where is that picture from exactly? I can't quite work it out.

Yeah me too, where abouts is this wire please?

[jonnny1975]

Hi all, great forum. Thanks for all the guidance over the years.

So, I've recently had the same (auto handbrake error - "hand brake & ABS warning lights on") issue on both my 2014 Citroen C4's within 6 months of each other : (
- I've fixed this on one car (C4 Picasso) but would welcome guidance on fixing the other (C4 GP).

1) My 'now fixed' C4 Picasso had a corrosion/break in one of the twisted wires near the rear wheel arch area (passenger side), just before it entered the car body.
- This was hard to find, as it meant removing the wires from the shielding and studying all of the wires for a break. Once found, it was an easy fix using a standard electrical strip connector and electrical tape. Perfect result.

2) My C4 Grand Picasso also had a break in 2 of the wires, directly at the point where they terminate into the 4-pin electrical plug that connects to the rear brake calliper (driver side).
- However, although being much easier to find (literally plugged into the calliper, which you immediately see when the rear wheel is off), fixing it has been more problematic as the wires are broken tight at the plug and therefore impossible to solder/crimp/connector strip at this point as the wire is too short to work with : (

So, my options are either: -

1) Find a car salvage yard/auction site with a 2nd hand C4 plug with 5-10cm of 4 wires retained, so I can join my car wires conveniently into the spare lengths using crimps/connectors & tape.
2) Find a new plug and crimp my wires into it (extending any wires shortened by the break),
3) Open the existing plug and crimp my existing wires back into it (extending any wires shortened by the break)

i did a temp fix with one wire using a connector strip & tape, and the other by jamming the 2 wires together using a larger cutting of copper wire. It fixed the problem for now, but i know the next deep pothole will have it undone before long.

So, I'd prefer to go with option 3), but I've no experience opening this type of plug and crimping wire into it. (see pics)

Any guidance from anyone with experience would be gratefully received.

Huge thanks in advance.

Post Update:

Found the calliper plug in...

Ebay - https://shorturl.at/MluYw (but looks a bit rough : )
Aliexpress - https://www.aliexpress.com/i/1005005794336024.html (Now just trying to see if they'll ship it to Scotland!
Also, a local scrapyard has a C4 2013 for braking, so I'll know on Monday if they have a plug.

[RichardW]

Welcome along!

Not sure you can de-pin that connector; getting one off a scrap car and splicing it in seems best - sometimes you can get new connectors from Citroen, but no guarantee this one is available.

[jonnny1975]

Thank you Richard. I appreciate the kind welcome and very useful advice. I'll get in contact with the scrap yards now.
Cheers. John : )

[nimik]

I confirm corroded wire on rear right ABS sensor just before being attached to the fuel tank.
I had all accompanying errors: TPM, parking brake, etc.

[merlin667]

Nimik, it looks like your green wire is also allready damaged. in my case it was a bit worse. in addition the copper was allready corroded far into the insulation i needed to replace about 15cm of the ABS sensor loom. luckily i had some twisted pair wiring at home from my 3D Printer (CAN Bus wiring to toolhead)