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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 6L50/6L80/6L90 - DTC P0218 To DTC P0971 >> DTC P0601, P0602, P0603, P0604, or P1621 >> Circuit/System Verification

Circuit/System Verification

  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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