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Home >> GMC >> 1998 >> Yukon RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 70 (Automatic Transmission Diagnosis - 4L80-E (Gasoline)) >> Diagnostic Tests >> DTC P0742: Torque Converter Clutch (TCC) Circuit Inoperative (Stuck On) >> Diagnostic Aids

Diagnostic Aids

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TCC may mechanically stick on with parking brake applied and any gear range selected. TCC fluid will mechanically apply TCC, which may cause engine to stall. A stuck TP sensor will set DTC P0742. First diagnose and clear any engine or TP sensor DTCs, then inspect for any transmission DTCs that may have reset.

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