Clutch pedal is stuck and won't move.
Your clutch hydraulic system works very similarly to your brake system. If the clutch pedal is stuck in the down position and cannot be moved up at all then the clutch master cylinder has failed and has seized internally. If the pedal can be moved up by hand and just does not return on its own then you may have a problem with the clutch slave cylinder or the clutch release bearing in the transmission. The clutch will need to be inspected by a certified mechanic, like one from YourMechanic. If it is the clutch master cylinder it will need to be replaced and then the system will need to be bled.
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