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Home >> GMC >> 2011 >> Yukon Base, 5.3 3 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Automatic Transmission - 2ML70 - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0634 >> Circuit/System Verification

Circuit/System Verification

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  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.
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