| Sign | Probable cause | Method of elimination |
| Vibration, noise | Damage to the gearbox and engine mounts | Tighten the fasteners |
| Increased axial clearance of the shaft | Adjust the gap | |
| Gears are worn or damaged | Replace | |
| Using non-recommended oil | Fill with recommended transmission oil | |
| Low oil level | Add oil | |
| Inadequate idle speed | Adjust the idle speed | |
| Oil leaks | The sealing rings are damaged | Replace the o-rings |
| The gear shift lever is difficult to move | The control cable is faulty | Replace the control cable |
| Contact failure or wear of the conical surface of the synchronizer and gear | Replace | |
| The synchronizer spring is weakened | Replace the synchronizer spring | |
| Using non-recommended oil | Fill with recommended transmission oil | |
| Spontaneous gear disengagement | The shift forks are worn out or the disc spring is broken | Replace the fork or spring |
| Excessive synchronizer sleeve clearance | Replace the synchronizer bushing |
(The article is copied from this website HYUNDAIBOOK)