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Thread: Hummer H2 2006 -

  1. 10-12-2020 #1
    canton-tech
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    Hummer H2 2006 -

    Hi all,

    I have problem to read hummer H2. I cant read ECM / there is fail.

    After 20%, the dashboard switch off.

    How can i fix it ?

    best regards.
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  2. 10-12-2020 #2
    awest623
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    Usually voltage problems. Are all your grounds good and battery charged/good? Try hooking up a battery charger while reading.
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  3. 10-15-2021 #3
    canton-tech
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    I dont know how to dsable Retained Accessory Power (RAP) !
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  4. 10-15-2021 #4
    2xLS1
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    Pull radio and radio amp fuse in underhood fuse box.
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  5. 10-15-2021 #5
    blindsquirrel
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    RAP is only active after the key is turned to OFF position and all doors remain closed.
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  6. 10-15-2021 #6
    canton-tech
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    I Pulled radio and radio amp fuse, then bcm fuse...
    I keep 1 door open. ... In Drive, in Neutral, impossible to read !
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  7. 10-15-2021 #7
    blindsquirrel
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    Then it's not RAP causing your issues.

    Does the dash "switch off" if you keep the key on and not attempting to read?
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  8. 10-15-2021 #8
    2xLS1
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    Is it an aftermarket radio or does it have an aftermarket remote start?
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  9. 11-19-2021 #9
    Kevin Walker
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    its noises from the systems on the rig, I had the same problem, there are like 5 fuses you need to pull, then it will read, I'll go take a picture of mine and show you, pull all fuses with red paint pen on them, doors closed, HVAC off and it will read
    IMG_0154.jpg
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