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.
2011 Hyundai Equus SignatureFACTORY OEM SERVICE PROCEDURE
Engine Control System Diagnosis (2 Of 3)
- DTC Index
- DTC P0219: Engine Overspeed Condition
- DTC P0221: Throttle Position Sensor 2 Signal Circuit Range/Performance
- DTC P0222: Throttle Position Sensor 2 Signal Circuit Low Input
- DTC P0223: Throttle Position Sensor 2 Signal Circuit High Input
- DTC P0230: Fuel Pump Primary Circuit
- 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 P0273: Cylinder 5 Injector Circuit Low
- DTC P0274: Cylinder 5 Injector Circuit High
- DTC P0276: Cylinder 6 Injector Circuit Low
- DTC P0277: Cylinder 6 Injector Circuit High
- DTC P0279: Cylinder 7 Injector Circuit Low
- DTC P0280: Cylinder 7 Injector Circuit High
- DTC P0282: Cylinder 8 Injector Circuit Low
- DTC P0283: Cylinder 8 Injector Circuit High
- DTC P0300: Random/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 P0305: Cylinder 5-Misfire detected
- DTC P0306: Cylinder 6-Misfire detected
- DTC P0307: Cylinder 7 Misfire Detected
- DTC P0308: Cylinder 8 Misfire Detected
- DTC P0327: Knock Sensor 1 Circuit Low (Bank 1)
- DTC P0328: Knock Sensor 1 Circuit High (Bank 1)
- DTC P032C: Knock Sensor 3 Circuit Low (Bank 1)
- DTC P032D: Knock Sensor 3 Circuit High (Bank 1)
- DTC P0332: Knock Sensor 2 Circuit Low (Bank 2)
- DTC P0333: Knock Sensor 2 Circuit High (Bank 2)
- DTC P0335: Crankshaft Position Sensor 'A' Circuit
- DTC P0336: Crankshaft Position Sensor 'A' Circuit Range/Performance
- DTC P033C: Knock Sensor 4 Circuit Low (Bank 2)
- DTC P033D: Knock Sensor 4 Circuit High (Bank 2)
- DTC P0340: Camshaft Position Sensor 'A' Circuit (Single Sensor)
- DTC P0341: Camshaft Position Sensor A Circuit Range/Performance (Bank 1)
- DTC P0345: Camshaft Position Sensor 'A' Circuit (Bank 2)
- DTC P0346: Camshaft Position Sensor A Circuit Range/Performance (Bank 2)
- DTC P0365: Camshaft Position Sensor B Circuit Malfunction (Bank 1)
- DTC P0366: Camshaft Position Sensor 'B' Circuit Range/Performance (Bank 1)
- DTC P0390: Camshaft Position Sensor 'B' Circuit (Bank 2)
- DTC P0391: Camshaft Position Sensor 'B' Circuit Range/Performance (Bank 2)
- DTC P0420: Catalyst System Efficiency below Threshold (Bank 1)
- DTC P0430: Catalyst System Efficiency Below Threshold (Bank 2)
- DTC P0442: Evaporative Emission System-Leak detected (small leak)
- DTC P0444: Evaporative Emission System-Purge Control Valve Circuit Open
- DTC P0447: Evaporative Emission System - Vent Control Circuit Open
- DTC P0448: Evaporative Emission System - Vent Control Circuit Shorted
- DTC P0449: Evaporative Emission System-Vent Valve/Solenoid Circuit
- DTC P0450: Evaporative Emission System Pressure Sensor/Switch
- DTC P0451: Evaporative Emission System-Pressure Sensor Range/Performance
- DTC P0452: Evaporative Emission System-Pressure Sensor Low Input
- DTC P0453: Evaporative Emission System-Pressure Sensor High Input
- DTC P0455: Evaporative Emission System-Leak detected (Large leak)
- DTC P0456: Evaporative Emission System-Leak detected (very small leak)
- DTC P0457: Evaporative Emission System-Leak detected (tank cap loose/off)
- DTC P0458: Evaporative Emission System Purge Control Valve Circuit Low
- DTC P0459: Evaporative Emission System Purge Control Valve Circuit High
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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