Manual transmission — malfunctions (Hyundai Elantra J2)

Sign	Probable cause	Method of elimination
Noise, vibrations	Engine or gearbox mount is loose or damaged	Tighten or replace the fastener
	Inadequate clearance at the end of the shaft	Adjust the clearance
	Gears are worn or damaged	Replace the gears
	Bearings are worn or damaged	Replace the bearings
	Poor quality oil	Replace the oil with the appropriate one
	Low oil level	Top up
	Incorrect engine idle speed	Adjust the idle speed
Oil leak	Broken or damaged oil seals or O-rings	Replace the seal or o-ring
Difficulty shifting gears	Control cable malfunction	Replace the control cable
	Poor contact or wear of the synchronizer ring and the conical surface of the transmission	Repair or replace
	The synchronizer spring is stretched	Replace the synchronizer spring
	Poor quality oil	Replace the oil with the appropriate one
The transmission switches off spontaneously	The shift fork is worn out or the disc spring is broken	Replace the shift fork or disc spring
	Large clearance of the synchronizer hub on the sleeve splines	Replace the synchronizer hub and sleeve
	Gears and/or bearings are worn or damaged	Replace