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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 6L50/6L80/6L90 - DTC P0973 To DTC P2764 >> DTC P1684, P1685 or P1686 >> Circuit/System Verification

Circuit/System Verification

  1. Start the engine for 1 minute and observe the TCM power up temperature sensor and the TCM temperature sensor.
  2. The system is operating normally if the TCM power up temperature is within 10°C (18°F) of the TCM temperature sensor.
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