Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSHYUNDAI2003ELANTRA GLS, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SELF-DIAGNOSTICS
2003 Hyundai Elantra GLS, Automatic
Engine Controls - Self-Diagnostics
2003 Hyundai Elantra GLS, AutomaticSECTION Engine Controls - Self-Diagnostics
- Introduction
- Self-Diagnostic System
- Engine Control Module Location
- Intermittent Diagnostic Trouble Codes
- Connector Terminal Identification
- Diagnostic Trouble Code Definitions
- Summary
- Diagnostic Tests
- DTC P0010: Camshaft Position - Timing Over-Advanced Or System Performance (Bank 1)
- DTC P0030: Ho2S Heater - Heater Control Circuit (Bank 1/Sensor 1)
- DTC P0031: Ho2S Heater Circuit Low (Bank 1/Sensor 1)
- DTC P0032: Ho2S Heater Circuit High (Bank 1/Sensor 1)
- DTC P0036: Ho2S Heater - Heater Control Circuit (Bank 1/Sensor 2)
- DTC P0037: Ho2S Heater Circuit Low (Bank 1/Sensor 2)
- DTC P0038: Ho2S Heater Circuit High (Bank 1/Sensor 2)
- DTC P0076: Intake Valve Control Solenoid Circuit Low (Bank 1)
- DTC P0077: Intake Valve Control Solenoid Circuit High (Bank 1)
- DTC P0101: Mass Or Volume Air Flow Circuit Range Performance Problem
- DTC P0102: Mass Or Volume Air Flow Circuit Low Input
- DTC P0103: Mass Or Volume Air Flow Circuit High Input
- DTC P0112: Intake Air Temperature Circuit Low Input
- DTC P0113: Intake Air Temperature Circuit High Input
- DTC P0116: Engine Coolant Temperature Circuit Range Performance
- DTC P0117: Engine Coolant Temperature Circuit Low Input
- DTC P0118: Engine Coolant Temperature Circuit High Input
- DTC P0121: Throttle Pedal Position Circuit Range Performance Problem
- DTC P0122: Throttle Pedal Position Circuit Low Input
- DTC P0123: Throttle Pedal Position Circuit High Input
- DTC P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control
- DTC P0128: Coolant Thermostat (Coolant Temp. Below Thermostat Regulating Temp.)
- DTC P0131: Ho2S Circuit Low Input (Bank 1/Sensor 1)
- DTC P0132: Ho2S Circuit High Input (Bank 1/Sensor 1)
- DTC P0133: Ho2S Circuit Slow Response (Bank 1/Sensor 1)
- DTC P0136: Ho2S Circuit Malfunction (Bank 1/Sensor 2)
- DTC P0137: Ho2S Circuit Low Input (Bank 1/Sensor 2)
- DTC P0138: Ho2S Circuit High Input (Bank 1/Sensor 2)
- DTC P0139: Ho2S Circuit Slow Response (Bank 1/Sensor 2)
- DTC P0140: Ho2S Circuit No Activity Detected (Bank 1/Sensor 2)
- DTC P0171: Fuel Trim Malfunction - System Too Lean (Bank 1)
- DTC P0172: Fuel Trim Malfunction - System Too Rich (Bank 1)
- DTC P0196: Engine Oil Temp. Sensor Range Performance
- DTC P0197: Engine Oil Temp. Sensor Low Input
- DTC P0198: Engine Oil Temp. Sensor High Input
- DTC P0261: Cylinder 1 - Injector Circuit Low
- DTC P0262: Cylinder 1 - Injector Circuit High
- DTC P0264: Cylinder 2 - Injector Circuit Low
- DTC P0265: Cylinder 2 - Injector Circuit High
- DTC P0267: Cylinder 3 - Injector Circuit Low
- DTC P0268: Cylinder 3 - Injector Circuit High
- DTC P0270: Cylinder 4 - Injector Circuit Low
- DTC P0271: Cylinder 4 - Injector Circuit High
- DTC P0300: Multiple Cylinder Misfire Detected
- DTC P0301: Cylinder 1 - Misfire Detected
- DTC P0302: Cylinder 2 - Misfire Detected
- DTC P0303: Cylinder 3 - Misfire Detected
- DTC P0304: Cylinder 4 - Misfire Detected
- DTC P0325: Knock Sensor 1 Circuit Malfunction
- DTC P0335: Crankshaft Position Sensor Circuit Malfunction
- DTC P0340: Camshaft Position Sensor Circuit Malfunction
- DTC P0341: Crankshaft Position - Camshaft Position Correlation (Bank 1)
- DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1)
- DTC P0441: EVAP Emission System Incorrect Purge Flow
- DTC P0442: EVAP Emission System - Leak Detected (Small Leak)
- DTC P0444: EVAP Emission System - Purge CTRL. Valve Circuit Open
- DTC P0445: EVAP Emission System - Purge CTRL. Valve Circuit Shorted
- DTC P0447: EVAP Emission System - Vent Control Circuit Open
- DTC P0448: EVAP Emission System - Vent Control Circuit Shorted
- DTC P0449: EVAP Emission System - Vent Valve Solenoid Circuit
- DTC P0451: EVAP Emission System - Pressure Sensor Range Performance
- DTC P0452: EVAP Emission System - Pressure Sensor Low Input
- DTC P0453: EVAP Emission System - Pressure Sensor High Input
- DTC P0454: EVAP Emission System - Pressure Sensor Intermittent (DTP_Noise)
- DTC P0455: EVAP Emission System - Leak Detected (Large Leak)
- DTC P0456: EVAP Emission System - Leak Detected (Very Small Leak)
- DTC P0501: Vehicle Speed Sensor Range Performance
- DTC P0506: Idle Control System - Rpm Lower Than Expected
- DTC P0507: Idle Control System Rpm Higher Than Expected
- DTC P0560: System Voltage Malfunction
- DTC P0562: System Voltage Low
- DTC P0563: System Voltage High
- DTC P0600: Serial Communication Link Malfunction
- DTC P0605: Internal Control Module Read Only Memory (ROM) Error
- DTC P0606: ECM Pcm Processor (ECM - Self Test Failed)
- DTC P0650: Malfunction Indicator Lamp (Mil) Control Circuit Malfunction
- DTC P1166: Ho2S System - Lambda Controller At The Limit (Bank 1)
- DTC P1372: Segment Time Acquisition Incorrect
- DTC P1505: Idle Charge Actuator Signal Low Of Coil #1
- DTC P1506: Idle Charge Actuator Signal High Of Coil #1
- DTC P1507: Idle Charge Actuator Signal Low Of Coil #2
- DTC P1508: Idle Charge Actuator Signal High Of Coil #2
- DTC P1529: TCU Request For Mil On
- DTC P1602: Can Communication Bus With TCU (Timeout)
- DTC P2096: Post Catalyst Fuel Trim System Too Lean (Bank 1)
- DTC P2097: Post Catalyst Fuel Trim System Too Rich (Bank 1)
- DTC P2195: Ho2S Signal Stuck Lean (Bank 1 Sensor 1)
- DTC P2196: Ho2S Signal Stuck Rich (Bank 1/Sensor 1)
- DTC P2231: Ho2S Signal Circuit Shorted To Heater Circuit (Bank 1/Sensor 1)
- DTC P2237: Ho2S Pumping Current Circuit Open (Bank 1/Sensor 1)
- DTC P2243: Ho2S Reference Voltage Circuit Open (Bank 1/Sensor 1)
- DTC P2251: Ho2S Reference Ground Circuit Open (Bank 1/Sensor 1)
- DTC P2270: Ho2S Signal Stuck Lean (Bank 1/Sensor 2)
- DTC P2271: Ho2S Signal Stuck Rich (Bank 1/Sensor 2)
- DTC P2414: Ho2S Exhaust Sample Error (Bank 1/Sensor 1)
- DTC P2626: Ho2S Pumping Current Trim Circuit Open (Bank 1/Sensor 1)
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.