Description of diagnostic trouble codes (Hyundai Elantra J2)

Code	Diagnostic trouble code (for voltmeter)	Cause	Method of elimination
11		Short circuit in the throttle position sensor circuit	Check the throttle position sensor connector. Check the throttle position sensor. Check the idle switch. Check the wiring of the throttle position sensor
12		Throttle position sensor circuit open
13		Throttle position sensor malfunction
14		The throttle position sensor is not adjusted correctly
15		The liquid temperature sensor circuit is broken	Check the fluid temperature sensor connector. Check the fluid temperature sensor. Check the wiring of the liquid temperature sensor
21		The downshift servo switch circuit is broken	Check the servo switch connector. Check the servo switch. Check the wiring of the servo switch
22		Short circuit in the step-down servo switch circuit
23		The ignition pulse sensor circuit is broken	Check the ignition pulse signal line. Check the wiring between the control unit and the ignition system
25		Short circuit in the circuit or incorrect adjustment of the idle switch	Check the idle switch connector. Check the idle switch. Adjust the idle switch. Check the wiring of the idle switch
31		The circuit of the pulse generator A is broken	Check pulse generators A and B. Check the vehicle speed reed relay. Check the wiring of pulse generators A and B
32		The pulse generator circuit is broken
41		Shift control solenoid valve A circuit broken	Check the solenoid valve connector. Check shift control solenoid valve A. Check the wiring for the shift control solenoid valve A
42		Short circuit in shift control solenoid valve A circuit
43		Shift control solenoid valve B circuit open	Check the solenoid valve connector. Check shift control solenoid valve B. Check the wiring to the shift control solenoid valve B. Check the pressure control solenoid valve. Check the wiring of the pressure control solenoid valve
44		Short circuit in shift control solenoid valve B circuit
45		The pressure control solenoid valve circuit is broken
46		Short circuit in the pressure control solenoid valve circuit
47		The damper clutch solenoid valve circuit is broken. Short circuit in the damper clutch solenoid valve circuit	Check the solenoid valve connector. Check the damper clutch control solenoid valve separately. Check the wiring to the damper clutch control solenoid valve. Check the transmission control module. Check the damper clutch hydraulic system
48		Defect in the damping clutch system
49
51		First gear engagement does not match engine speed	Check the connector of pulse generator A and pulse generator B. Check pulse generators A and B. Check one clutch stroke or rear clutch. Check the wiring of the pulse generator
52		The engagement of the second gear does not correspond to the engine speed
53		Third gear engagement does not match engine speed	Check the rear clutch or control system. Check the connectors of pulse generators A and B. Check pulse generators A and B. Check front clutch slippage or control system. Check rear clutch slippage or control system. Check the wiring of the pulse generator
54		The engagement of fourth gear does not correspond to the engine speed	Check the connectors of pulse generators A and B. Check pulse generators A and B. Inching brake slippage. Check the end coupling or control system. Check the wiring of the pulse generator
		Fine