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Circuit/System Verification

WARNING: This page is about a different car, the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
  1. Key ON, engine ON. Let engine run for at least 1 minute.
  2. Key OFF for at least 30 seconds to allow for the complete shutdown of the TCCM.
  3. Key ON, engine OFF.
  4. Verify that DTC C0387 is not set.
    • If DTC C0387 is set, diagnose it first.
  5. Verify that DTC C0569 is not set.
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