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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 505 (Automatic Transmission - 2ML70 - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0634 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify that DTC P0563 is not set.
  2. Ignition ON, observe the scan tool Trans. Fluid Temp. parameter. The reading should be less than 141°C (286°F).
    • If greater than the specified range, test for a transmission overheat condition.
  3. Observe the scan tool TCM temperature parameter. The reading should be less than 141°C (286°F).
    • If greater than the specified range, replace the Q8 control solenoid assembly.