Diagnostic Aids
WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
Gear clashing may be caused by shifting above 5000 RPM or not fully depressing the clutch pedal. If gear clashing is occurring in more than one gear, the clutch may not be releasing properly for proper synchronizer operation.