Code Definition

P0742 — Torque Converter Clutch Circuit Stuck On

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0742

P0742 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0742 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0742 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The fault code P0742 is set when the Transmission Control Module (TCM) detects that the torque converter clutch (TCC) circuit is abnormally stuck in the 'on' position. This situation indicates that the TCC is engaged constantly or longer than expected, without disengaging when it should. This can lead to issues such as the vehicle stalling when coming to a stop or a decrease in fuel efficiency.

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