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Hummer Bummer

This bulletin applies to 2008-2010 Hummer H2 vehicles. The BCM may be damaged when the module is supplied with battery power and the ground path is removed.

You must remove the negative battery cable first before removing a BCM ground.  It is important to note when removing a ring terminal ground, splice pack connector or inline harness connector that it does not include a BCM ground path.

As an example, if the BCM becomes disconnected, internal damage to the BCM will occur. Other systems controlled by the BCM also will be affected, such as inoperative or intermittent conditions in one or more of the following systems:

  • Interior lighting will remain on or will not work.
  • Exterior lighting will remain on or will not work.
  • Remote keyless entry.
  • Door locks.
  • Power windows and mirrors.
  • Remote vehicle start.
  • Remote trunk release.
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