ABS, Power Steering and Speedometer Failure

Dear friends, please can you help.
My boy's 2012 c3 1.4 mk2 'White' 32,000 miles threw up a warning on the LCD screen saying Brake System Fault and it started beeping three times.

I plugged my cheap OBD2 reader in and it said U0415 unspecified ABS error. It then lit the dash up like a Christmas tree and the LCD display started saying ABS fault, Power Steering fault, Airbag fault.
Driving the car the steering is a bit tighter, the ABS is not working (I've checked and the car skids), the engine is a little lumpy, the needle on the speedometer remains on zero.
Some forums say to replace the gearbox speed sensor, but our car has a blanking plate in that location.
I've checked all fuses, including the big ones hidden under the fuseboard.
I've removed the front ABS sensors and cleaned them.
The rear sensors are recessed into the back of the wheel drum back plates so I fear I may break them if I try removing them.
I've removed the inner arches, found the electrical connectors and checked for corrosion.
I've unplugged the electrical connector to the ABS pump and checked for corrosion.

I've had a friend with a better OBD2 kit and his brought up fault codes U0415, C3150, 0150, 05FF 001C, U1113 and U1313.

I've replaced the Camshaft position sensor.
Nothing I've tried has made any difference. I tried speaking to the Citroen main dealer at Eastbourne but they were very patronising and were not interested.
I really need to get the car fixed at an affordable cost, your help would be most appreciated.
Many thanks in advance.
JP.

Hi

(ABS), power steering and speedo all get their signal from the same place.

That is the road speed sensor. If you don't have ABS, the signal comes from the gearbox sensor. You obviously don't have this sensor because you have ABS.

With an ABS car, the road speed signal is taken from the ABS ECU.

The ABS ECU gets the road speed from the wheel sensors.


Use the lexia system to diagnose the ABS wheel sensors for the ABS light, power steering failure and speedo at zero fault.

That is helpful, thank you. Now I just have to try and find a technician near Eastbourne with a Lexia or Diagbox. I don't really want to buy one myself just to check.

Hi friends
Just a quick note to say my problem is resolved, thank goodness. Having replaced the wheel speed/ABS sensors and camshaft position sensor (fault codes suggested looking at them) I was left with the worrying prospect it could be the ABS pump and/or the ABS controller, which is attached to the pump. Having tried to avoid the Citroes main dealer, I finally took it there because I was struggling to find time to arrange the kind help offered from a forum member. Citroen were not overly helpful saying it might/might not be the ABS controller, something already suspected, however they were happy to take my £120 inspection fee and offer to replace the ABS controller for £950, just in case. That was beyond my boys budget so I found an identical one from a breakers on eBay. The replacement ABS pump and controller came yesterday, so I took the day off work today to swap them over.
Initially I only swapped the controller but hey presto it completely solved the problem. Citroen wanted £950 just for the controller, the lot from the breakers was £25. My own cheapo OBD reader cleared the fault code and everything started working again. My boy now has ABS, Powersteering, airbags, seatbelts, a speedo, mileage and trip meter. The car runs smoothly again and all the dashboard lights have gone out.
Thank you for kind words of support from the forum members.
Best regards
Justin