Troubleshooting issues (Hyundai Elantra XD)

Sign	Probable cause	Method of elimination
Vibration, noise	Damage to gearbox mount and lower frame	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
	Worn or damaged gears and/or bearings	Replace gears and/or bearings