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A clutch that continues to transmit some torque when it should be fully disengaged, on an automated manual or dual-clutch transmission. A partially released clutch makes gear selection difficult or impossible, because the gearbox is being asked to change ratio while still connected to a turning engine.

The symptoms are mechanical and audible. Grinding on engagement, a refusal to select a gear at rest, or creep with the vehicle supposedly in neutral. The module sees it as a shift that will not complete and stores actuator or position codes, so the fault is reported at the gearbox while it lies in the clutch.

Hydraulic release systems fail toward this state, which is the useful pattern. Air in the circuit, a leaking master or slave cylinder, or a low fluid level all shorten the travel available, so the clutch releases partly and no further. Check clutch actuator travel and fluid before the clutch itself — a worn friction plate is a much larger job and much less common as a cause of poor release. Adaptation matters too: a clutch replaced without its touch point relearned is being commanded against the old one and may not fully release.