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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1371 (Automatic Transmission - 6L80/6L90 - DTC P0218 To DTC P0963) >> DTC P0601, P0602, P0603, P0604, or P1621 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. 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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