The invention provides an HCU, an HCU clutch fault detecting and processing method wherein the detecting method comprises: when the closing control signal for the clutch is transmitted, detecting whether the clutch is experiencing a sliding fault or not; and when a sliding fault is detected to have occurred to the clutch, diagnosing the fault type of the sliding fault of the clutch. With the above schemes, it is possible to detect the clutch fault and to make the driving more secure.