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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 P0634 >> Component Testing

Component Testing

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Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection . Look for apparent TCM damage or any conditions that would cause temperature problems, such as severe sediment or debris build up.

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