ESP/ABS warning... C1391... C003A Right rear speed sensor

[Dustysweeper]

Could this be giving the car all these gremlins?
This is just as the cable trunking goes over the rear axle. My mext question is.... Where can I find this section of wire new?

[GiveMeABreak]

Absolutely it can!

Well found. For these sorts of issues, Citroen just recommend an in-place repair. This looks like it has been rubbing and worn away the insulation. I would make a decent secure repair and then afterwards encase it in some of this protective tubing which can be had in various sizes that you can just pop over it to protect it.

[Dustysweeper]

If I had solder I'd have done it there and then. Going to grab the stuff needed tomorrow and make repairs. Fingers toes and everything else crossed.

I'll let you know. Thanks for the help.

[Dustysweeper]

Done the repair. All warnings extinguished and all suspended functions restored on turning ignition on. Road test wasn't so glorious. All the same warnings appeared once I reached 16mph. Only this time I can cancel all codes barr one that is in the steering module, which relates to invalid speed information from the EPS ecu. (Picture attached)

The ABS module still points to the rear right speed sensor and non confirmationof engine torque, with one difference. It comes up as a temporary fault that I can clear now. I wasn't able to before! (Picture attached)
The same with the comunication fault in the Engine ECU I am able to clear it, but not before the repair.

The sensors are still showing different speeds when stationary. (Picture attached)

The steering angle sensor is still wrong too. (Picture attached)

I'm leaning towards pulling both the right sensor wires as far as I can and just replacing them with something I have at hand. But that's a job for tomorrow.

[Dustysweeper]

Took the middle seat out to gain access to the wiring under the carpet. Tested continuity between plugs, all fine! no further brakes in this section anyway! Other than changing the sensor again and the hub, I have gone as far as I can with this myself.

The diagnostic says for ABS. C003A. Rear right speed sensor. Temporary fault. C2391 Engine torque not cleared. Temporary fault. I can clear both these. I cannot clear the invalid speed information code in the steering ECU.

[GiveMeABreak]

Unfortunately your diagnostic seems unable to provide the full fault code as there can be 8 possibilities of the C003A, identified by the missing last 2 alphanumeric characters (7 in total), so I can't give you specifics.

C003A 01 Rear right wheel speed sensor: Malfunction of the circuit
C003A 11 Rear right wheel speed sensor: Short circuit to earth
C003A 12 Rear right wheel speed sensor: Short circuit to positive
C003A 2F Rear right wheel speed sensor: Signal incorrect
C003A 62 Rear right wheel speed sensor: Lack of coherence of the signal
C003A 68 Rear right wheel speed sensor: Air gap problem (clogging)
C003A 95 Rear right wheel speed sensor: Non-coherent type of wheel speed sensor
C003A 96 Rear right wheel speed sensor: Internal fault

If you can find the last 2 characters I can give you more specific info. So as per your request on the Parts thread, whether it is a duff ECP sensor or not I can't say.

[MGmike]

Hi Doo. Nice of you to offer some help. I'm in Falkirk, if you'renot to far away, I may take you up on that.

Hi, I'm in East Calder if you want/need a lexia session.

[Dustysweeper]

Hi Doo. Nice of you to offer some help. I'm in Falkirk, if you'renot to far away, I may take you up on that.

Hi, I'm in East Calder if you want/need a lexia session.

That would be great thak you!. I've sent you a message.

[Dustysweeper]

Big thanks to MGmike. plugged in his diagbox and found and cleared a load of BSI codes. ABS code is reading C003A 62 Lack of coherence of the signal. Speed on all sensors read correct except the rear right. I'm now leaning in the direction of changing the Wheel bearing. It's possibly been damaged when the sensor was changed, the old one was a pig to remove. Not to mention, there's a lot of corrosion around the bearing. We shal see..

[GiveMeABreak]

Well done both - fingers crossed this is the issue.

[Dustysweeper]

Changed the rear right hub today and all warning lights and fault codes extinguished. Including the steering fault code. My tool still reports -780° on the steering angle but I'm guessing it's my diagnostic tool not reading it correctly. Well either way it ain't broke so I'm leaving it alone.

Thank you all for your valued input over the last few weeks.

Kind regards

Duncan

[Martino07]

Abs espr
Parking brake faults on my 3008 gt line

Looking for some guidance?

Hub and sensor changed found break in the wire repair carried out maybe not the best?

Also have ad blue and engine management light on

[GiveMeABreak]

For adblue check when you last filled up the tank - what does the countdown counter say when you turn the ignition on?

As for wheel sensor any issue with one of these can lead to lack of cruise control, ESP deactivation / Hill Start Assist etc.

If you have any fault codes put them up so we can see what the issue (s) are along with your VIN. Please post your VIN in full without spaces - it will be automatically masked from public view after submitting your post & will only be visible to staff.

[Martino07]

The counter is now saying starting impossible in 600 miles,
I filled the tank thinking that was what it needed but it only took around 3 litres,

I thought that with the abs being on it’s all linked hopefully, new hub fitted and repair to wiring slough maybe not the best as I’ve just looked at that myself,


C003A rear right wheel speed sensor
Permanent

U029D fault in communication with DeNox system

U1213 fault in communication with the abs/esp ecu

U3FFF high pressure fuel circuit

Sorry not sure how to post a picture on this,

I’m in falkirk also.

Thanks martin

[GiveMeABreak]

Ok, so U029D means there is an Electrical fault in the emission control system and requires some fault finding and possible repair of power supply or earth(s) and/or the emission control CAN depending on the result of the checks.

The checks involve:

• Check the power supply to the urea gauge-pump module, the urea reservoir and the NOx sensor
• Check the earth of the urea reservoir gauge-pump module and the NOx sensor
• Check the continuity and the isolation of the emission control CAN

Depending on the checks, the repair of the positive, earth or electrical harness is required, so this needs checking first before replacement of the DeNox sensor or Pump assembly, otherwise replacing these parts may not resolve the issue.

How old is the vehicle? Depending on the age and service history there may be some level of dealer support - but it will cost you a diagnostic charge for them to check the issue.