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Thread: U2105 No communication with ECM

  1. #1
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    Default U2105 No communication with ECM

    Still struggling a bit with this veccy..
    After replacing the Steering Control Interface Module (CIM) that got rid of a few DTC’s but im still left with one or two. The worst one being
    U2105 from about 3 different modules, mainly the IPC (instruments) and the ABS/TC/ESP saying no communication with ECM.
    90% of the time when i scan the car with the TECH2 that above error code is not present. But when that error code IS present the car will not even attempt to start. I.e. no clicking from relays or starter motor noise etc (sounds about right as the ecu is part of the starting cycle)
    Most of the time the car will try to start and power the starter motor but sounds like its a flat battery and wont crank fast enough (traced all relating wires back to ECU harness plug and all seem fine and battery is new)
    If the car does start then after driving the car dies momentarily all clocks die etc and pick back up.. after reading many posts with similar problems that relate to the CIM i changed this but hasn’t solved the issue at all.
    Also on the forum there is mention of a dodge ABS plugs behind the battery tray, upon inspection of this plug it all seems good, contacts look clean and in place.

    The other code that is in the system relates to the automatic headlamp levelling getting low voltage (TIS2000 states the unit needs 3seconds of constant voltage)
    other problem with the car that may or may not be related are intermittent front wipers inop (only super fast work) and the radio inop.


    Anybody know how to check the canbus wires/system on the ECU? Its raining now so cant check, Think they are green and white.
    Dont really wana guess and fork out just shy of £500 for a new ECU

  2. #2
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    Vehicle : Vectra

    Trim : SRi

    Engine : 150

    Year : 05

    Mileage : 74000

    Default

    When you do a ECU presence check does it pick the affected ecu's up in the table?

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    I confess I'm not all too familiar with this, as I've only read about swapping CIM's not actually done it, but have you programmed all the modules to pair them up with the replacement CIM.

    If you don't do do this all the vehicle identifiers and security information will be from the old CIM and you'll get comms errors since the modules won't communicate properly. They need cleared and reprogrammed with the new CIM's information.

    Sure somebody that knows for sure will be along in a bit...

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    Yeah, the presence checks confirms all the modules are there and programmed correctly..

    The annoying thing is that its intermitent.. (the problem was there before the CIM replacement) and still is now

    either a short or break in the can wires of the ECU playing up when its wants

    shunter: after the programming of High canbus, mid canbus, low canbus, variant coding and vin, immobiliser, transponder + keys and mechanical key number and calibrate the steering angle sensor... tech2 automatically links up the new CIM to the numerous other modules. oh and remove the ignition barrel and control stalks... think thats all LoL
    Last edited by crash112211; 7th July 2008 at 21:19.

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    If anyone was following this it was indeed the ECM playing up.. after replacing and programming all is ok.. except my wallet

    £575 for the part alone and to look at its tiny!

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    Quote Originally Posted by crash112211 View Post
    £575 for the part alone...


    At least it's working now.

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    Vx wanted around the £900 mark for diagnostics fitting and coding for the whole job :s

    It had to be done as the car really wasnt reliable or even drivable at times.. goes well now hehe

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