ECU Problem maybe

This is the Forum for all your Citroen Technical Questions, Problems or Advice.

Moderator: RichardW

Post Reply
Keir
Posts: 17
Joined: 24 Apr 2019, 12:54
Location: Ireland
My Cars: C4 Grand Picasso
x 1

ECU Problem maybe

Post by Keir »

good evening all,

I had my c4 with the garage today, for that abs rubbish that is still haunting me
the guy said there was a ton of fault codes up,
i didnt even bother to ask him what they were,
however he did tell me that my ECU has a problem
can anyone shed any light on this , do ECU's give trouble ?

anyway any help or suggestions would be greatly welcomed

regards Keir
Hell Razor5543
Donor 2023
Posts: 13726
Joined: 01 Apr 2012, 09:47
Location: Reading
My Cars: C5 Mk2 VTX+ estate.
x 2993

Re: ECU Problem maybe

Post by Hell Razor5543 »

I would take it to a different garage, for a start. There are numerous ECUs in a car, and without knowing which one has the problem it would be impossible to say what the problem is.
James
ex BX 1.9
ex Xantia 2.0HDi SX
ex Xantia 2.0HDi LX
Ex C5 2.0HDi VTR
Ex C5 2.0HDi VTR

C5 2.2HDi VTX+
Yes, I am paranoid, but am I paranoid ENOUGH?
Out amongst the stars, looking for a world of my own!
User avatar
GiveMeABreak
Forum Admin Team
Posts: 36996
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 5644

Re: ECU Problem maybe

Post by GiveMeABreak »

Keir wrote: 28 May 2019, 20:58 good evening all,

I had my c4 with the garage today, for that abs rubbish that is still haunting me
the guy said there was a ton of fault codes up,
i didnt even bother to ask him what they were,
however he did tell me that my ECU has a problem
can anyone shed any light on this , do ECU's give trouble ?

anyway any help or suggestions would be greatly welcomed

regards Keir

Keir - The idea is that there are lots of individual ECUs over several data networks on the vehicle. They are controlled by a master computer if you like called a BSI. When something goes wrong the ECU can inform the BSI and if appropriate, it will store a fault code, that can later be retrieved with a diagnostic tool, to help troubleshooting.

The ECUs are rarely at fault - but the components they control can fail like anything else. It would of been helpful to have a list of the fault codes, as we could of helped with troubleshooting. What is important is that you have a competent mechanic or garage that understands that fault codes can be symptomatic of another component further up or down the line. So if one component is failing, it can pass on incorrect data or no data at all to another ECU that relies on it to do its particular job. If the second ECU gets faulty or no data, then that ECU can flag up a fault.

So it's important to understand all the related faults and use these as a guide to try and get back to the main culprit. So don't immediately think that there are lots of issues - it may simply be one component.
Please Don't PM Me For Technical Help

Marc
Keir
Posts: 17
Joined: 24 Apr 2019, 12:54
Location: Ireland
My Cars: C4 Grand Picasso
x 1

Re: ECU Problem maybe

Post by Keir »

yes agree with you GiveMeABreak

im not well up on car eletrics as it were, at all,
however I usually start with sensors when stuff goes worng.
I didnt get the chance to see the fault codes as i wasnt there,

so where to go from here ive no idea
User avatar
GiveMeABreak
Forum Admin Team
Posts: 36996
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 5644

Re: ECU Problem maybe

Post by GiveMeABreak »

So the first step is to get it diagnosed (preferably by somebody with a Lexia diagnostic tool). Run a global test and record all the fault codes. Post them up here and we can start to see what each says which will give you a clue to troubleshooting. This is what a garage would normally do. There's not much we can do here without them to be honest. :wink:
Please Don't PM Me For Technical Help

Marc
Keir
Posts: 17
Joined: 24 Apr 2019, 12:54
Location: Ireland
My Cars: C4 Grand Picasso
x 1

Re: ECU Problem maybe

Post by Keir »

Good morning all

Marc can you tell me how to upload an image please?
Keir
Posts: 17
Joined: 24 Apr 2019, 12:54
Location: Ireland
My Cars: C4 Grand Picasso
x 1

Re: ECU Problem maybe

Post by Keir »

Front right speed sensor
Deviant
Permanent

Engine control unit, absence of clearing of the ASR/MSR
reference value

Permanent
User avatar
Paul-R
Donor 2023
Posts: 6916
Joined: 07 May 2009, 16:24
Location: Wirral, NW England; Vaucluse 84, France
Lexia Available: Yes
My Cars: 2015 1.6 Blue HDi 120 Peugeot 308 Active SW
2013 2.0 HDi 163 C5 Exclusive Tourer
2003 2.0 HDi 110 C5 Exclusive Estate (Gone)
2001 2.0 HDi 90 Xsara Estate (Gone)
x 1369

Re: ECU Problem maybe

Post by Paul-R »

Keir wrote: 29 May 2019, 11:12...how to upload an image please?

viewtopic.php?f=9&p=516529#p516529
As I get older I think a lot about the hereafter - I go into a room and then wonder what I'm here after.

Inside every old person is a young person wondering what the hell happened.

"Trying is the first step towards failure" ~ Homer J Simpson​
Keir
Posts: 17
Joined: 24 Apr 2019, 12:54
Location: Ireland
My Cars: C4 Grand Picasso
x 1

Re: ECU Problem maybe

Post by Keir »

Cheers Paul. I posted the faults manually 😂😂
RichardW
Forum Treasurer
Posts: 10812
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 983

Re: ECU Problem maybe

Post by RichardW »

Ah, a deviant ABS sensor :lol:

You really need to see the live data to see what the ECU is (or isn't seeing). The fact that the light goes out suggest that the sensor passes its initial resistance check, but then the signal is not coherent somehow. Has it had a new wheel bearing? I'd have a very good look at the back of the bearing to see if there any signs of distress on the mag track, they can be easily damaged.
Richard W
User avatar
GiveMeABreak
Forum Admin Team
Posts: 36996
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 5644

Re: ECU Problem maybe

Post by GiveMeABreak »

Keir - I really need the fault codes to be able to help
Please Don't PM Me For Technical Help

Marc
Keir
Posts: 17
Joined: 24 Apr 2019, 12:54
Location: Ireland
My Cars: C4 Grand Picasso
x 1

Re: ECU Problem maybe

Post by Keir »

Thank Richard and Marc.
I don’t have access to the actual codes
I’ll see what I can get dug up
tyronejohn
New User
Posts: 1
Joined: 06 Oct 2022, 19:33
Location: Belfast
My Cars: Peugeot 208

Re: ECU Problem maybe

Post by tyronejohn »

Hi all!

I see there hasn't been much activity on this forum in a couple of years.

I am wondering if someone could help me out with the faults that have appeared on a Peugeot 208 that I have.

A lot of these faults seem relate to the ECU - I have posted the photos below of the relevant fault codes.

I am a bit of a car novice but can anyone advise if these are worth fixing or even on the cost / time to fix?

Thanks a mill!!
Attachments
208 photo 5.jpg
208 photo 13.jpg
208 photo 12.jpg
208 photo 11.jpg
208 photo 10.jpg
208 photo 9.jpg
208 photo 7.jpg
208 photo 6.jpg
208 photo 4.jpg
208 photo 3.jpg
208 photo 2.jpg
208 photo 1.jpg
User avatar
Ross_K
Posts: 1055
Joined: 18 Jul 2004, 22:26
Location: Ireland
Lexia Available: Yes
My Cars: 2009 Citroen C5 VTR+ HDi 1.6
2004 Toyota Prius
2004 Alfa Romeo 156 1.6 Twin Spark
x 110

Re: ECU Problem maybe

Post by Ross_K »

That's a lot of codes :-D

See the printer icon on the tablet screen? If you click that you can save the report as a text file and upload it here. It's a bit easier on the eyes that way
Screenshot 2022-10-06 at 20.38.21.png
ImageImage
RichardW
Forum Treasurer
Posts: 10812
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 983

Re: ECU Problem maybe

Post by RichardW »

Most are showing intermittent, and that is the sort of blizzard you get when the battery is low. What's actually up with it? I would clear all those out and then see what comes back.
Richard W
Post Reply