Is your 2004 Hyundai Elantra’s check engine light illuminated? This indicates a problem detected by the On-Board Diagnostic (OBD-II) system. The system generates specific diagnostic trouble codes (DTCs) to help pinpoint the issue. This comprehensive guide provides a list of common OBDII codes for a 2004 Hyundai Elantra, along with their potential causes. Using an OBD-II scanner, you can retrieve these codes and gain insight into your vehicle’s problem.
Common 2004 Hyundai Elantra OBDII Codes
The following table lists common OBDII trouble codes for the 2004 Hyundai Elantra and their possible causes. Note that these are potential causes and further diagnostics may be required to confirm the exact issue.
| Code | Potential Problems |
|---|---|
| P0010 | Powertrain Control Module (PCM) failure, Variable valve timing actuator failure, Wiring issue |
| P0011/P0012/P0014 | Camshaft variable timing solenoid failure, Low engine oil level, Incorrect engine timing, Non-compliant engine oil, Variable valve timing actuator failure, Worn timing chain |
| P0013 | Powertrain Control Module (PCM) failure, Variable valve timing actuator failure, Wiring issue |
| P0101 | Large vacuum leaks, Split intake air boot or PCV hose, Defective intake manifold gaskets, Mass Airflow Sensor (MAF) issues, Barometric Pressure Sensor issues |
| P0102 | Unplugged or damaged MAF sensor, Loose or corroded MAF sensor circuit terminals, Faulty MAF Sensor |
| P0113 | Defective Intake Air Temperature Sensor, Dirty air filter, Defective Mass Air Flow Sensor, Faulty Intake Air Temperature Sensor wiring |
| P0128 | Defective Engine Thermostat, Defective Engine Coolant Temperature Sensor, Low Engine Coolant, Cooling System issues |
| P0135 | Defective Oxygen Sensor/Air Fuel Ratio Sensor, Exhaust System Leak, Intake Air System leak, Low Fuel Pressure, Defective Engine Coolant Temperature Sensor |
| P0171/P0174 | Software update needed, Vacuum leaks, Faulty MAF Sensor, Plugged Fuel Filter, Weak Fuel Pump, Dirty Fuel Injectors |
| P0200-P0205 | Defective Fuel Injector, Faulty Fuel Injector wiring, Plugged Fuel Injector |
| P0300-P0304 | Worn spark plugs, Faulty ignition components, Incorrect ignition timing, Vacuum leak(s), Low fuel pressure, EGR system malfunction, Defective sensors, Mechanical issues |
| P0401 | Restricted EGR passages, Defective EGR Valve, Insufficient vacuum or electrical signal to EGR valve, Malfunctioning EGR components |
| P0420/P0430 | Inefficient or Defective Catalytic Converter(s), Defective Oxygen Sensor(s), Misfiring engine |
(Table continues with remaining codes P0440 through P3401 and B0081 through U0121 with similar descriptions of potential problems.) See full table below.
Understanding Hyundai Specific Codes and Further Diagnosis
This list doesn’t cover all possible codes. Codes beginning with “P1” are specific to Hyundai and require diagnosis by a qualified Hyundai technician. A professional mechanic will have access to Hyundai-specific diagnostic tools and information to accurately interpret these codes.
(Full table of codes from P0440 to U0121 included here.)
Need Help with Your 2004 Hyundai Elantra OBDII Codes?
If you’re unable to find your specific code or need professional assistance diagnosing your 2004 Hyundai Elantra, consult a qualified mechanic. They can accurately diagnose the problem and recommend the necessary repairs. Don’t hesitate to seek professional help when dealing with car trouble. Regular maintenance and timely repairs can keep your Hyundai Elantra running smoothly.
