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Circuit/System Verification

WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
  1. Hood closed, start the engine with the ignition key and allow to idle.
  2. Monitor engine operation and the tachometer display for 5 minutes.
  3. The vehicle should enter the Autostop hybrid mode.
    • If the vehicle operates in the Autostop hybrid mode, the system is operating normally.
    • If the vehicle cycles rapidly in and out of the Autostop hybrid mode, test the auxiliary transmission fluid pump pressure. Refer to Line Pressure Check .
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