Hyundai OBD1 Trouble Codes
The following trouble codes are specific to Hyundai. You may also see Kia trouble codes, since Hyundai and Kia are of the same parent company.
Hyundai Trouble Codes Access
With Multi-Use Tester (Except 1993-1995 Scoupe)
To access the trouble codes, proceed as follows:
- Turn ignition switch to off.
- Connect harness connector of multi-use tester to diagnostic connector in fuse box, located on left kick panel.
- Connect power-source terminal of multi-use tester to cigarette lighter socket.
- Turn ignition switch on, then use multi-use tester to read self-diagnostic codes.
- Repair any malfunctions found using tester.
- Turn ignition switch off, then disconnect the battery negative terminal for 10 seconds.
- Check that no malfunction codes are displayed with multi-use tester.
- Disconnect multi-use tester.
With Analog Voltmeter (Except 1993-1995 Scoupe)
To access the trouble codes, proceed as follows:
- Connect voltmeter to self-diagnosis connector, located in fuse box on left kick panel.
- Turn ignition switch on and note an immediate indication of ECM (ECU) memory contents will begin. If system is in normal condition, pointer of voltmeter indicates a normal pattern. If any abnormality is in the memory, pointer of voltmeter will deflect indicating an abnormal condition.
- After recording abnormal items, check and repair each part.
- After repairs have been completed, disconnect the battery negative terminal for at least 15 seconds to erase codes from memory.
With On-Board Diagnostic Lamp (1993-1995 Scoupe)
To access the trouble codes, proceed as follows:
- With ignition switch in the on position, ground the No. 10 terminal (L wire) of diagnostic connector for approximately 2.5 seconds.
- The diagnostic connector is located on the left hand kick panel. The first diagnostic trouble code or no fault detected will be indicated by the on-board diagnostic lamp. The onboard diagnostic lamp will indicate trouble codes by flashing frequencies and 2 second pauses. For example, one flash, followed by a 2 second pause, followed by two flashes and another 2 second pause, followed by three flashes and a 2 second pause, followed by three flashes and another 2 second pause, indicates a failure code 1233. The fault code will be repeated until the No. 10 terminal of the diagnostic connector is grounded to proceed to the next fault code.
- The last output consist of the end of output code 3333.
Hyundai Trouble Codes Clearance
All trouble codes must be cleared from the ECU’s memory after repairing the faults. Otherwise, code(s) would remain in the ECU’s memory indefinitely and would appear along with a new code in the event of a future problem. To clear the trouble codes, proceed as follows:
- Turn the ignition key to position off.
- Disconnect the battery negative terminal for at least 20 seconds and the ECU (ECM) memory will be erased.
- Reconnect the battery negative terminal and check the codes to confirm the repair.
Warning: Disconnecting the battery may erase memory from electronic units, e.g., clock, radio.
Hyundai Stellar Vehicles Trouble Codes
- Click the table header to sort the table data by the respective column heading.
- Type keyword(s) in the table’s search box for a quick display of the searched data.
| Code(s) | Description |
|---|---|
| 1 | Oxygen sensor or circuit |
| 2 | Ignition signal |
| 3 | Airflow sensor or circuit |
| 4 | Atmospheric pressure sensor or circuit |
| 5 | Throttle position sensor or circuit |
| 6 | Idle Speed Control (ISC) motor position sensor or circuit |
| 7 | Coolant temperature sensor or circuit |
| 8 | TDC sensor or circuit |
| 9 | System normal |
Hyundai Sonata, Excel (90 on), Scoupe (91 & 92), Elantra Trouble Codes
- Click the table header to sort the table data by the respective column heading.
- Type keyword(s) in the table’s search box for a quick display of the searched data.
| Code(s) | Description |
|---|---|
| 1 | Electronic Control Unit (ECU) (one long needle sweep) |
| 2 | ECU system normal |
| 11 | Oxygen sensor or circuit |
| 12 | Airflow sensor or circuit |
| 13 | Intake air temperature sensor or circuit |
| 14 | Throttle Position Sensor (TPS) or circuit |
| 15 | Motor position sensor or circuit |
| 21 | Coolant temperature sensor or circuit |
| 22 | Crank angle sensor or circuit |
| 23 | TDC sensor or circuit |
| 24 | Vehicle Speed Sensor or circuit |
| 25 | Barometric pressure sensor or circuit |
| 41 | Fuel injector or circuit |
| 42 | Fuel pump or circuit |
| 43 | EGR system |
| 44 | Ignition coil |
| 59 | Oxygen sensor |
Hyundai Scoupe (93 through 95) and Accent Vehicles Trouble Codes
- Click the table header to sort the table data by the respective column heading.
- Type keyword(s) in the table’s search box for a quick display of the searched data.
| Code(s) | Description |
|---|---|
| 1122 | ECM failure (ROM/RAM) |
| 1169 | ECM failure |
| 1233 | ECM failure (ROM) |
| 1234 | ECM failure (RAM) |
| 2121 | Turbo boost sensor control valve |
| 3112 | NO. 1 fuel injector |
| 3114 | Idle air control (opening failure) |
| 3116 | NO. 3 fuel injector |
| 3117 | Mass airflow sensor |
| 3121 | Turbo boost sensor failure |
| 3122 | Idle air control (closing failure) |
| 3128 | Heated oxygen sensor |
| 3135 | EVAP purge control solenoid valve |
| 3137 | Alternator output low |
| 3145 | Engine coolant temperature (ECT) sensor |
| 3149 | Air conditioning compressor |
| 3152 | Turbocharger overboost |
| 3153 | Throttle position switch (TPS) |
| 3159 | Vehicle speed sensor (VSS) |
| 3211 | Knock sensor |
| 3222 | Phase sensor |
| 3224 | ECM failure (knock evaluation circuit) |
| 3232 | Crank position sensor |
| 3233 | Same as 3224 |
| 3234 | NO. 2 fuel injector |
| 3235 | NO. 4 fuel injector |
| 3241 | ECM failure (injector or purge solenoid) |
| 3242 | ECM failure (IAC or air conditioning relay) |
| 3243 | ECM failure |
| 4133 | ECM failure |
| 4151 | Air/fuel control |
| 4152 | Air/fuel adaptive failure |
| 4153 | Air/fuel multiple adaptive failure |
| 4154 | Air/fuel additive adaptive failure |
| 4155 | ECM failure (A/C relay, IAC, PCV or injector) |
| 4156 | Same as code 3121 |
| 4444 | Normal |
| 3333 | End of trouble codes |