Citroen C5 X7 U1108 & U1308 error codes
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Thread: Citroen C5 X7 U1108 & U1308 error codes

  1. #1
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    Default Citroen C5 X7 U1108 & U1308 error codes

    Hi All,
    I am getting error codes U1108 & U1308 on my 2010 Citroen C5 3.0l Hdi.

    Has anyone else had experience in how to resolve/diagnose these?

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    I have a Diagbox laptop.

    Thanks!

    Leon.

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    Leon

    1986 Peugeot 505 GTD (Donor car)
    1987 Peugeot 505 GTD
    1988 Peugeot 505 GTD (For Sale)
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  2. #2
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    Any symptoms or apparent downgrade modes?
    They relate to gearbox CAN network communication faults.
    Apparently suspect areas are Engine and auto ECU's and the wiring harness.
    Maybe start with a battery check and make sure there is no corrosion on any of the harness earth points.
    Sometimes, apparent gearbox faults were actually due to a bad relay in the engine slave so you might suspect that, depending on the vehicle mileage and whether there are other faults possibly pointing to a dodgy supply relay in the slave.
    dieselman and electroboy like this.

  3. #3
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    It has a new battery. The faults also appeared with the old battery.
    Gearbox and ABS fault messages appear on the dash. I think there was a handbrake fault message too.
    I had issues with the Park Lock shunt not releasing, but this was fixed by replacing the micro relay under the glovebox.

    Where is the engine relay you are referring to located please?

    Thanks
    Leon.

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    Leon

    1986 Peugeot 505 GTD (Donor car)
    1987 Peugeot 505 GTD
    1988 Peugeot 505 GTD (For Sale)
    1992 Peugeot Familiale Wagon (For Sale)
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  4. #4
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    Quote Originally Posted by dieselman View Post
    It has a new battery. The faults also appeared with the old battery.
    Gearbox and ABS fault messages appear on the dash. I think there was a handbrake fault message too.
    I had issues with the Park Lock shunt not releasing, but this was fixed by replacing the micro relay under the glovebox.

    Where is the engine relay you are referring to located please?

    Thanks
    Leon.

    Sent from my LG-H815 using Tapatalk
    It also goes into limp mode (held in 3rd gear).
    After some time, the fault will go away, but seems to return eventually.
    Sometimes the motor will not crank over.

    Sent from my LG-H815 using Tapatalk
    Leon

    1986 Peugeot 505 GTD (Donor car)
    1987 Peugeot 505 GTD
    1988 Peugeot 505 GTD (For Sale)
    1992 Peugeot Familiale Wagon (For Sale)
    2007 VW EOS TDi
    2010 Citroen C5 3.0 V6 HDi

  5. #5
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    Engine slave = engine fuse/relay box. Left side of engine bay, towards the rear. A bad relay in the unit can cause a main supply fault and be the source of otherwise unexplained issues.

    However, since you say you have had an issue with the park lock, also look at this:
    https://translate.google.com/transla...4950&edit-text=

    Essentially, where you have found yourself struck in park and have/had these faults:
    P0928: Short circuit to ground or a broken circuit in the solenoid of the shift lock;
    U1108: No communication with the electronic unit motor;
    U1308: No communication with the automatic transmission electronic unit

    Try:
    End the diagnosis session.
    Switch on ign.
    Turn the ignition OFF for 50 seconds.
    Switch on ign.
    Start a diagnosis session without turning the ignition off.
    Clear the error codes.

    Note, this is a TSB being quoted and they are normally VIN-specific.
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  6. #6
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    Quote Originally Posted by David S View Post
    Engine slave = engine fuse/relay box. Left side of engine bay, towards the rear. A bad relay in the unit can cause a main supply fault and be the source of otherwise unexplained issues.

    However, since you say you have had an issue with the park lock, also look at this:
    https://translate.google.com/transla...4950&edit-text=

    Essentially, where you have found yourself struck in park and have/had these faults:
    P0928: Short circuit to ground or a broken circuit in the solenoid of the shift lock;
    U1108: No communication with the electronic unit motor;
    U1308: No communication with the automatic transmission electronic unit

    Try:
    End the diagnosis session.
    Switch on ign.
    Turn the ignition OFF for 50 seconds.
    Switch on ign.
    Start a diagnosis session without turning the ignition off.
    Clear the error codes.

    Note, this is a TSB being quoted and they are normally VIN-specific.
    Thanks for the info.
    My battery terminals had a small amount of corrosion, so I cleaned it off.
    I have already cleared the faults earlier today. This is the first time I have cleared them. I will wait to see if it reoccurs and I will try your suggestion.

    Leon.
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    Leon

    1986 Peugeot 505 GTD (Donor car)
    1987 Peugeot 505 GTD
    1988 Peugeot 505 GTD (For Sale)
    1992 Peugeot Familiale Wagon (For Sale)
    2007 VW EOS TDi
    2010 Citroen C5 3.0 V6 HDi

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    The official PSA book may have some help. I'll leave the translation to you.
    U1108 Le calculateur multifonctions moteur est confirmé absent -- Liaison avec calculateur contrôle moteur. CMM est confirmé Absent

    U1308 Le calculateur multifonctions moteur entraîne des défauts fonctionnels -- Incohérence information frein/état de la RVV ou en BVA (Position pédale non émise par contrôle moteur ou Régime moteur non émis par contrôle moteur ou Température eau non émise par contrôle moteur ou Couple non émis par contrôle moteur)
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  8. #8
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    Quote Originally Posted by David S View Post
    Engine slave = engine fuse/relay box. Left side of engine bay, towards the rear. A bad relay in the unit can cause a main supply fault and be the source of otherwise unexplained issues.

    However, since you say you have had an issue with the park lock, also look at this:
    https://translate.google.com/transla...4950&edit-text=

    Essentially, where you have found yourself struck in park and have/had these faults:
    P0928: Short circuit to ground or a broken circuit in the solenoid of the shift lock;
    U1108: No communication with the electronic unit motor;
    U1308: No communication with the automatic transmission electronic unit

    Try:
    End the diagnosis session.
    Switch on ign.
    Turn the ignition OFF for 50 seconds.
    Switch on ign.
    Start a diagnosis session without turning the ignition off.
    Clear the error codes.

    Note, this is a TSB being quoted and they are normally VIN-specific.
    Here's a photo of the left side of my engine bay. I can only see a glow plug relay. Would the engine relay be hidden underneath something?

    Thanks.
    Leon

    1986 Peugeot 505 GTD (Donor car)
    1987 Peugeot 505 GTD
    1988 Peugeot 505 GTD (For Sale)
    1992 Peugeot Familiale Wagon (For Sale)
    2007 VW EOS TDi
    2010 Citroen C5 3.0 V6 HDi

  9. #9
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    It's known as the engine slave, BSM or engine fuse/relay box. Same thing and further forward in your car. The thing with all the fuses in it and a sealed box with relays buried inside. You are not meant to change individual relays as they are encapsulated. However, people do sometimes cut them open and replace individual components.

    Maybe, follow that TSB before spending any money? It's a legitimate TSB that applies to at least some 3.0HDi C5 and someone has placed in the public domain.
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  10. #10
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    Hi Guys,

    Translation:

    U1108 The multifunction engine control unit is confirmed missing - Link with engine control computer. CMM is confirmed Absent

    U1308 The multifunctional engine control unit causes functional faults - Brake / VVC status / Brake status inconsistency (Pedal position not emitted by engine control or Engine speed not emitted by engine control or Water temperature not emitted by engine control or Emissions not emitted by motor control)

    The engine fuse box can cause all sorts of problems, and is known to fail. The replacement box is fitted with larger relays, and believe me, the units inside are not replaceable.

    I replaced the engine fuse box in a friends car just before Christmas. Its a 2013 X7 2.0 HDI. It was coming up with multiple power and pollution problems. The fuse box for all X7's is part no: 98 070 285 80 ($352.78).

    While there is no Guarantee that the fuse box is the problem, you can check the date on the unit in the car, and if its the original, replacement is a good start?

    I tried for about half an hour to pull the old unit apart, and failed to even separate the two plastic halves.

    Best regards,

    Greg
    We Have:
    C5 HDI Exclusive 2.7 '09, Pluriel '09, Berlingo 1.6 HDI '10, C4 VTS coupe. C4 Picasso '08, 2CV Charleston '84 Grey, 2CV, '55 Australian delivered. 15/6 H '55, SM '74 BVM, DS21 EFI BVH, DS21 '67 BVH.
    We Had:
    1930C6F, '73 GS1220 wagon X 2, '75 G special, '75 GS panel van, '74 GS Birotor, '82 GSA panel van with factory AC, '85 CX25GTI BVM, 2002 C5 V6, 2006, C5 S2 HDI, '86 BX19GT, '72 DS21 BVM, '55 15/6H, '54 Lt 15,'73 Dyane, '82 Visa Super X, with Chrono Mecs & factory AC, 1972 SM.

  11. #11
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    Quote Originally Posted by Greg View Post
    Hi Guys,

    Translation:

    U1108 The multifunction engine control unit is confirmed missing - Link with engine control computer. CMM is confirmed Absent

    U1308 The multifunctional engine control unit causes functional faults - Brake / VVC status / Brake status inconsistency (Pedal position not emitted by engine control or Engine speed not emitted by engine control or Water temperature not emitted by engine control or Emissions not emitted by motor control)

    The engine fuse box can cause all sorts of problems, and is known to fail. The replacement box is fitted with larger relays, and believe me, the units inside are not replaceable.

    I replaced the engine fuse box in a friends car just before Christmas. Its a 2013 X7 2.0 HDI. It was coming up with multiple power and pollution problems. The fuse box for all X7's is part no: 98 070 285 80 ($352.78).

    While there is no Guarantee that the fuse box is the problem, you can check the date on the unit in the car, and if its the original, replacement is a good start?

    I tried for about half an hour to pull the old unit apart, and failed to even separate the two plastic halves.

    Best regards,

    Greg
    Hi Greg,
    Where did you buy the fuse box for that price please?
    I was quoted over $700!

    Leon.
    Leon

    1986 Peugeot 505 GTD (Donor car)
    1987 Peugeot 505 GTD
    1988 Peugeot 505 GTD (For Sale)
    1992 Peugeot Familiale Wagon (For Sale)
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  12. #12
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    New battery installed, terminals cleaned and greased with dielectric grease and new fuse box fitted.
    Still getting Gearbox Fault error message occasionally

    Any further suggestions?

    Thanks.
    Leon

    1986 Peugeot 505 GTD (Donor car)
    1987 Peugeot 505 GTD
    1988 Peugeot 505 GTD (For Sale)
    1992 Peugeot Familiale Wagon (For Sale)
    2007 VW EOS TDi
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  13. #13
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    With a previous C5 X7 (2008) I had had an issue with a number of unrelated fault codes, gearbox, emission etc...on a couple occasions it cut out while driving and would go into limp mode.
    A couple of times I removed the fault and hoped for the best, but kept throwing seemingly unrelated codes and going back into limp.

    In desperation I went to a dealer who instantly diagnosed the accurate cause: Engine Speed sensor kaput. They fitted a new one in half an hour and never had a problem again.

    Sometimes - not always - it's worth a visit to a good dealer!

    Hope this helps.
    dieselman likes this.
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  14. #14
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    When I get the errors, I have noticed that the main ECU is very hot on the cooling fins. If I let it cool down, the problem goes away.
    Taking a look at Diagbox, I noticed a stuck power relay control. I don't imagine that this would be normal.
    Leon

    1986 Peugeot 505 GTD (Donor car)
    1987 Peugeot 505 GTD
    1988 Peugeot 505 GTD (For Sale)
    1992 Peugeot Familiale Wagon (For Sale)
    2007 VW EOS TDi
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  15. #15
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    Scroll halfway down this page. Or search for 'Bosch Edc17cp11' :
    https://www.facebook.com/pg/CRACKLEY...4418837/posts/
    and you will see an open ECU of this type, but from a Jaguar 3.0D.
    Assuming it's much the same as in the C5, you can probably get an idea which component is running hot and also where the relay is. It doesn't look too hard to remove the cover and have a look inside. Presumably someone like Injectronics in Melbourne could test/repair it if required as it's going into dodgy DIY territory. I think I'd still be looking elsewhere for a problem before blaming the ECU, which must be the most expensive and least likely item to give grief.

    p.s. Here's the picture to save wading through the awful Facebook page. Not having opened one from a C5, I can't say it's exactly the same.
    Citroen C5 X7 U1108 & U1308 error codes-c5_3.0hdi_jag3.0d_bosch_edc17cp11_ecu.jpg
    Last edited by David S; 9th February 2018 at 05:47 PM. Reason: Add picture

  16. #16
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    I just checked my wife's X7, she has the same relay stuck, so it's probably not an issue.
    Leon

    1986 Peugeot 505 GTD (Donor car)
    1987 Peugeot 505 GTD
    1988 Peugeot 505 GTD (For Sale)
    1992 Peugeot Familiale Wagon (For Sale)
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  17. #17
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    Would anyone have any recommendations for a competent Citroen dealer in Canberra please?
    Thanks.
    Leon

    1986 Peugeot 505 GTD (Donor car)
    1987 Peugeot 505 GTD
    1988 Peugeot 505 GTD (For Sale)
    1992 Peugeot Familiale Wagon (For Sale)
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  18. #18
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    With all the "disturbance", probably Alan Mackay at Moss Vale. They have had Peugeot for a long time, and now have Citroen also. The workshop has people with some familiarity with C5s.

    Not close, but a reasonable trip up the highway.

  19. #19
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    Quote Originally Posted by seasink View Post
    With all the "disturbance", probably Alan Mackay at Moss Vale. They have had Peugeot for a long time, and now have Citroen also. The workshop has people with some familiarity with C5s.

    Not close, but a reasonable trip up the highway.
    So no-one in Canberra?
    Leon

    1986 Peugeot 505 GTD (Donor car)
    1987 Peugeot 505 GTD
    1988 Peugeot 505 GTD (For Sale)
    1992 Peugeot Familiale Wagon (For Sale)
    2007 VW EOS TDi
    2010 Citroen C5 3.0 V6 HDi

  20. #20
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    After much messing about and visits to dealers, I think I may have figured out what has caused these errors!

    I thought I'd best try to resolve the problem once and for all and I was considering doing the 7 hour trip to Sydney to drop it in to Continental's.

    I thought back to when the problem first started occurring and then thought about what had changed.

    Just prior to the first occurrance, I changed the daytime running lights (halogen) to LED's as one had blown.
    I have now removed the LED's and replaced them both with halogen globes.

    So far, no errors!

    So perhaps the LED's were causing an error and the computer did not know what it was so it threw up a few random errors?

    Sent from my SM-T805Y using Tapatalk
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    Leon

    1986 Peugeot 505 GTD (Donor car)
    1987 Peugeot 505 GTD
    1988 Peugeot 505 GTD (For Sale)
    1992 Peugeot Familiale Wagon (For Sale)
    2007 VW EOS TDi
    2010 Citroen C5 3.0 V6 HDi

  21. #21
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    Dammit! I spoke too soon.
    The dreaded gearbox faulty message has returned
    Leon

    1986 Peugeot 505 GTD (Donor car)
    1987 Peugeot 505 GTD
    1988 Peugeot 505 GTD (For Sale)
    1992 Peugeot Familiale Wagon (For Sale)
    2007 VW EOS TDi
    2010 Citroen C5 3.0 V6 HDi

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