Hi,
Im getting the Abs/ESR fault along with hill start, parking brake etc
Lexia scan gives me these fault codes C1391 00 & C0037 11.
My vin is VF7**************[VIN obfuscated, can be read by forum staff] Its a 2014 C4 Grand picasso (B78)
Lets say the abs sensor is faulty. What is the procedure? ie remove the Disc, parking brake motor, dust shield and then remove the sensor? will the fuel tank have to be dropped? ( I used to own a PUG 407 and this had to be done then) From a quick look the wiring from the sensor disappears under the heat shield at one end of the fuel tank.
C4 picasso rear speed sensor
Moderator: RichardW
-
- (Donor 2021)
- Posts: 7
- Joined: 08 Feb 2021, 17:15
- Location: Ireland
- My Cars: 2014 C4 grand picasso B78 DV6C
- GiveMeABreak
- Forum Admin Team
- Posts: 37323
- Joined: 15 Sep 2015, 19:38
- Location: West Wales
- My Cars: C3 Aircross SUV HDi Flair Peperoncino Red (The Chili Hornet)
C5 X7 2.0 HDi Exclusive Mativoire Beige (The Golden Hornet)
C3 1.6 HDi Exclusive Aluminium Grey (The Silver Hornet)
C5 MK II 2.0 HDi Exclusive Obsidian Black
C5 MK I 2.0 HDi SX Wicked Red
Xantia S2 2.0 HDi SX Hermes Red
C15 Romahome White
XM 2.0 Turbo Prestige Emerald Green Pearlescent
XM 2.0 Turbo Prestige Polar White
XM 2.0 SX Polar White
CX 20 Polar White
GS 1220 Geranium Red
CX 2.4 Prestige C-Matic Nevada Beige
GS 1000 Cedreat Yellow - x 5721
Re: C4 picasso rear speed sensor
Ok, so C003711 refers to the rear left wheel speed sensor. There's a short circuit to earth.
When this fault is active, then it will deactivate a lot of ESP functionality, such as the ABS, ESP (including all traction control functions), Tyre pressure monitoring, Hill Start, Emergency Braking Assistance, Stop & Start system, and Semi-Automatic Parking if fitted). So that is why you will have all these errors.
Your suspect is the rear left wheel speed sensor of course, or the connections to and from it or the actual ESP ECU.
The other fault C139100 is a generic fault of the ESP ECU and that can be caused by the same speed sensor fault above. So I would focus on the rear left speed sensor first of all and once you've sorted that out, the other fault should also disappear. So just be aware of the deactivation of the said safety systems - as you'll have no ABS and no ESP.
As for replacing, I'll pop something up for your shortly...
Ok, so here's how to replace the rear wheel speed sensor:
Lift and support the vehicle.
When refitting, avoid impacts to the head of the rear wheel sensor.
Tightening Torque of the Rear Speed sensor bolt is 1 daNm
Then run another Global Test and clear the fault codes.
When this fault is active, then it will deactivate a lot of ESP functionality, such as the ABS, ESP (including all traction control functions), Tyre pressure monitoring, Hill Start, Emergency Braking Assistance, Stop & Start system, and Semi-Automatic Parking if fitted). So that is why you will have all these errors.
Your suspect is the rear left wheel speed sensor of course, or the connections to and from it or the actual ESP ECU.
The other fault C139100 is a generic fault of the ESP ECU and that can be caused by the same speed sensor fault above. So I would focus on the rear left speed sensor first of all and once you've sorted that out, the other fault should also disappear. So just be aware of the deactivation of the said safety systems - as you'll have no ABS and no ESP.
As for replacing, I'll pop something up for your shortly...
Ok, so here's how to replace the rear wheel speed sensor:
Lift and support the vehicle.
Disconnect the connector (at "a"). Remove the bolt (1) of the rear wheel speed sensor. | Remove the rear wheel speed sensor (2). |
Tightening Torque of the Rear Speed sensor bolt is 1 daNm
Then run another Global Test and clear the fault codes.
Please Don't PM Me For Technical Help
Marc
Marc
-
- Forum Treasurer
- Posts: 10871
- Joined: 07 Aug 2002, 17:12
- Location: United Kingdom
- My Cars: MK2 '17 C4GP 1.6 BlueHDi 120
'13 3008 1.6 HDi GripControl - x 996
Re: C4 picasso rear speed sensor
Given the propensity for these to rot the wires to the rear brake unit, I would check the wiring carefully before forking out for a new sensor although the sensors are same left / right, so it should be possible to swap them over and see if the fault moves which will point to either the sensor or wiring being at fault. Mind you,I'm willing to bet it won't be that easy to get out....
Richard W
-
- New User
- Posts: 1
- Joined: 26 Feb 2021, 23:08
- Location: dublin
- My Cars: c4 grand picasso II 2.0 bluehdi 150 2014
Re: C4 picasso rear speed sensor
hi. I had the same problem... abs asr parking brake engine faults... Diagbox showed me many faults but i had rear right speed sensor fault as well. The car was driving very short distance for over 4 weeks, but from few days I driving for work about 40km one way.. and after 5 days the all faults gone.. And I think it could be problem with battery,, if the faults come back i let you know...
-
- Posts: 77
- Joined: 21 Oct 2019, 19:31
- Location: Ireland
- My Cars: 2014 Citroen C4 Grand Picasso
- x 3
Re: C4 picasso rear speed sensor
Hi all,
Are problems back?
We have same issue for C4GP 2014. Lexia points at rear right sensor. Should I go ahead for new sensor and hope that this cures all issues or there is deeper, slower approach?
Are problems back?
We have same issue for C4GP 2014. Lexia points at rear right sensor. Should I go ahead for new sensor and hope that this cures all issues or there is deeper, slower approach?