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Thread: E39 ECU/PCM lost communication with SIDI VE V6

  1. #1
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    Default E39 ECU/PCM lost communication with SIDI VE V6

    Dear forum users

    i am from qld australia i have ve sidi v6 running ECU E39 model car is 2010 make 3L LF1 engine

    i modded the car added a mace tune by trifecta performance, i wanted to upgrade to EFI live tune software so i programed the car back to stock with Trifecta flash program, read my stock ECU TCM files sent those away got a base file back and tried to flash the ECU and it stopped half way and now ECU is getting fault code U0100 Lost communcation with the ECU/PCM

    so i towed the car to the holden service dealer, they couldnt get my ECU reading suggested a new ECU at a huge $$$ :( so i got a second hand ECU from the same model car year make engine and gear box its the same ECU E39 ac delco model

    it reads in the car fine but gives fault code P0315 crankshaft position system variration not learned and of course my VIN on the ECU is of the old cars vin not my car

    i want to know since i have 2 licences from EFI live on my flash scan 2 can i just licence the flash scan v2 to my new used ECU that reads just is the wrong VIN, then flash my old ECU E39 EFI Live tune with my cars actual VIN on the calibration by force flash will it acutallt wipe the used ECU with anothe cars VIN to my VIN and tune making the car able to start

    any help would be great, im told to take the car to holden service by the tuner and efi live supplier i already tried that and if i take the car to holden to reprogram to stock im looking at more $$$ plus it wont even drive stock due to the mods meaning more $$$ towing cost

    also another ? can anybody here get me a BRAND NEW ECU e39 ac delco model at a decent price compared to my local holden dealer ?

  2. #2
    Senior Member
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    Depending on the state the mace/trifecta left the ecu in and how the new base file was done it could have caused your original ecu to be bricked.

    The issue running the new ecu is mainly the security not being linked. The cranke angle variation (CASE) can easily be relearned. There shouldn't be a need for brand new Ecu. If you want to pm me I should be able to get you running again.

  3. #3
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    K I PM u thanks for your reply

    I understand he dead ECU should be bench flashable

    Also the new used ECU with another cars security and vin in it is that possible at all or Holden dealer to reprogram it to my car

  4. #4
    Joe (Moderator) joecar's Avatar
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    Use the V7 scantool to write your VIN in to the ECM.

    Before flashing the ECM in vehicle, disable the other modules on the CAN bus (remove their fuses).

  5. #5
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    ^ I will try this ASAP u mean try to write the VIN to my non readable ECU

    Or I can actually edit the VIN on the working ECU just from another car

    The working ECU I got is the same serial numbers from the same make model of car it runs the same calibration file just at moment the crank shaft isn't learned for the car it's in

    If I can actually edit the VIN on my ECU working to my cars vin tech the car might start or might e able force flash it

  6. #6
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    Please confirm can GM TECH2 Tool actually edit the vin like v7 EFI live? Cause I have a auto electric guy coming today with TECH2 to double check my non readable ECU & fuses/relays
    Last edited by 3L SIDI; September 8th, 2013 at 01:33 PM.

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