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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 115 (Diagnosis - VT25-E) >> Diagnostic Tests >> DTC P0742: TCC System - Stuck On >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Saturn Vue and 2002 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE: If DTC P0716, P0717, P0964, P0965, P0966, P1888, or P1889 has set, diagnose that DTC first.
  1. Start the engine. Leave gearshift lever in Park. Using scan tool, monitor TCC slip speed. Is TCC slip speed less than 3 RPM? If so, go to next step. If not, problem is intermittent. See DIAGNOSTIC AIDS  .
  2. Inspect the control valve body for the following:
    • Stuck TCC PC solenoid.
    • Stuck TCC enable solenoid.
    • Line limit valve and spring for damage, sticking or binding.
    • TCC control valve and spring for damage, sticking or binding.
    • TCC regulator valve for damage, sticking or binding.
    • TCC regulator apply valve spring for damage, sticking or binding.
    • Control valve body for damage, porosity or contamination.
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