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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 102 (Automatic Transmission Diagnosis - 4L60-E) >> Diagnostic Tests >> DTC P0742: TCC System - Stuck On >> Circuit Description

Circuit Description

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Torque Converter Clutch (TCC) solenoid valve stops converter signal oil exhaust. PCM commands solenoid on and off through ground circuit. When TCC solenoid is de-energized, solenoid will release fluid and release TCC. DTC P0742 is set if PCM detects a low torque converter slip when TCC is off.

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