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 MANUALSHYUNDAI2014EQUUS SIGNATUREREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM DIAGNOSIS (3 OF 3)
2014 Hyundai Equus Signature
Engine Control System Diagnosis (3 Of 3)
2014 Hyundai Equus SignatureSECTION Engine Control System Diagnosis (3 Of 3)
- DTC Index
- DTC P0441: Evaporative Emission System Incorrect Purge Flow
- 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 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
- DTC P0461: Fuel Level Sensor 'A' Circuit Range/Performance
- DTC P0462: Fuel Level Sensor 'A' Circuit Low Input
- DTC P0463: Fuel Level Sensor 'A' Circuit High Input
- DTC P0504: Brake Switch 'A'/'B' Correlation
- DTC P0506: Idle Air Control System-RPM Lower than Expected
- DTC P0507: Idle Air Control System-RPM Higher than Expected
- DTC P050A: Cold Start Idle Air Control System Performance
- DTC P050B: Cold Start Ignition Timing Performance
- DTC P0532: A/C Refrigerant Pressure Sensor 'A' Circuit Low Input
- DTC P0533: A/C Refrigerant Pressure Sensor 'A' Circuit High Input
- DTC P0560: System Voltage
- DTC P0562: System Voltage Low
- DTC P0563: System Voltage High
- DTC P0605: Internal Control Module Read Only Memory(ROM) Error
- DTC P0606: ECM/PCM Processor
- DTC P0611: Fuel Injector Control Module Performance
- DTC P061B: Internal Control Module Torque Calculation Performance
- DTC P0625: Generator Field/F Terminal Circuit Low
- DTC P0626: Generator Field/F Terminal Circuit High
- DTC P0627: Fuel Pump 'A' Control Circuit/Open
- DTC P0630: VIN Not Programmed or Incompatible-ECM/PCM
- DTC P0638: Throttle Actuator Control Range/Performance (Bank 1)
- DTC P0642: Sensor Reference Voltage 'A' Circuit Low
- DTC P064A: Fuel Pump Control Module
- DTC P0652: Sensor Reference Voltage 'B' Circuit Low
- DTC P0685: ECM/PCM Power Relay Control Circuit/Open
- DTC P0698: Sensor Reference Voltage 'C' Circuit Low
- DTC P1230: Low Pressure Fuel Pump malfunction
- DTC P1233: Low Pressure Fuel System - High deviation between target and current pressure
- DTC P2066: Fuel Level Sensor 'B' Performance
- DTC P2067: Fuel Level Sensor 'B' Circuit Low
- DTC P2068: Fuel Level Sensor 'B' Circuit High
- DTC P2096: Post Catalyst Fuel Trim System too Lean (Bank 1)
- DTC P2097: Post Catalyst Fuel Trim System too Rich (Bank 1)
- DTC P2098: Post Catalyst Fuel Trim System Too Lean (Bank 2)
- DTC P2099: Post Catalyst Fuel Trim System Too Rich (Bank 2)
- DTC P2106: Limp Home Mode - Force Limited Power
- DTC P2118: Throttle Actuator Control Motor Current Range/Performance
- DTC P2122: Accelerator Position Sensor 1 Signal Circuit Low Input
- DTC P2123: Accelerator Position Sensor 1 Signal Circuit High Input
- DTC P2127: Accelerator Position Sensor 2 Signal Circuit Low Input
- DTC P2128: Accelerator Position Sensor 2 Signal Circuit-High Input
- DTC P2138: Accelerator Position Sensor 1 & 2 Signal Voltage Correlation
- DTC P2159: Vehicle Speed Sensor 'B' Range/Performance(Wheel Speed Sensor)
- DTC P2187: System too Lean at Idle (←Additive) (Bank 1)
- DTC P2188: System too Rich at Idle (Bank 1)
- DTC P2189: System Too Lean at Idle (←Additive) (Bank 2)
- DTC P2190: System too Rich at Idle (Bank 2)
- DTC P2191: System too Lean at Higher Load (Multiple) (Bank 1)
- DTC P2192: System too Rich at Higher Load (Bank 1)
- DTC P2193: System Too Lean at Higher Load (←Multiple) (Bank 2)
- DTC P2194: System Too Rich at Higher Load (Bank 2)
- DTC P2227: Barometric Pressure Circuit Range/Performance
- DTC P2228: Barometric Pressure Circuit Low Input
- DTC P2229: Barometric Pressure Circuit High Input
- DTC P2270: O2 Sensor Signal Stuck Lean (Bank 1 Sensor 2)
- DTC P2271: O2 Sensor Signal Stuck Rich (Bank 1 Sensor 2)
- DTC P2272: O2 Sensor Stuck Lean - Bank2 Sensor 2
- DTC P2273: O2 Sensor Stuck Rich - Bank2 Sensor 2
- DTC P2294: Fuel Pressure Regulator 2 Control Circuit
- DTC P2295: Fuel Pressure Regulator 2 Control Circuit Low
- DTC P2296: Fuel Pressure Regulator 2 Control Circuit High
- DTC P2501: Implausible Battery Sensor voltage
- DTC P2502: Charging System Voltage
- DTC P2503: Charging System Voltage Low
- DTC P2540: Low Pressure Fuel System Sensor Circuit Range/Performance
- DTC P2541: Low Pressure Fuel System Sensor Circuit Low
- DTC P2542: Low Pressure Fuel System Sensor Circuit High
- DTC P2610: ECM/PCM-Engine Off Timer Performance
- DTC P2632: Fuel Pump 'B' Control Circuit/Open
- DTC U0001: High Speed CAN Communication Bus off (C-CAN)
- DTC U0100: Lost Communication With ECM/PCM 'A' (C-CAN)
- DTC U0101: Lost Communication with TCM (C-CAN)
- DTC U0105: Lost Communication With Fuel Injector Control Module
- DTC U0109: Lost Communication With Fuel Pump Control Module
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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.