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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 250 (Automatic Transmission - 6L50/6L80/6L90 - DTC P0218 To DTC P0971) >> DTC P0601, P0602, P0603, P0604, or P1621 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Cadillac Escalade EXT. However, it is still accessible from the selected car via links, so may be relevant.
  1. Start the engine.
  2. Let the engine run for 1 minute, then shut the engine OFF for 30 seconds.
  3. Retest for DTCs P0601, P0602, P0603, P0604, and P1621.
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