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 MANUALSHYUNDAI2011EQUUS SIGNATUREREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM DIAGNOSIS (3 OF 3)
2011 Hyundai Equus Signature
Engine Control System Diagnosis (3 Of 3)
2011 Hyundai Equus SignatureSECTION Engine Control System Diagnosis (3 Of 3)
- Diagnostic Trouble Code Index
- 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 P0496: Evaporative Emission System High Purge Flow
- DTC P0497: Evaporative Emission System Low Purge Flow
- DTC P0501: Vehicle Speed Sensor 'A' Range/Performance
- DTC P0502: Vehicle Speed Sensor 'A' Circuit Low Input
- DTC P0503: Vehicle Speed Sensor A Intermittent/Erratic/High
- 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 P0532: A/C Refrigerant Pressure Sensor 'A' Circuit Low Input
- DTC P0533: A/C Refrigerant Pressure Sensor 'A' Circuit High Input
- DTC P0562: System Voltage Low
- DTC P0563: System Voltage High
- DTC P0564: Cruise Control Multi-Function Input A Circuit
- DTC P0605: Internal Control Module Read Only Memory (ROM) Error
- DTC P0606: ECM/PCM Processor
- 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 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 P0645: A/C Clutch Relay Control Circuit
- DTC P0646: A/C Clutch Relay Control Circuit Low
- DTC P0647: A/C Clutch Relay Control Circuit High
- DTC P0650: Malfunction Indicator Lamp (MIL) Control Circuit
- DTC P0652: Sensor Reference Voltage 'B' Circuit Low
- DTC P0660: Intake Manifold Tuning Valve Control Circuit/Open (Bank 1)
- DTC P0661: Intake Manifold Tuning Valve Control Circuit Low (Bank 1)
- DTC P0662: Intake Manifold Tuning Valve Control Circuit High (Bank 1)
- DTC P0698: Sensor Reference Voltage 'C' Circuit Low
- DTC P0704: Clutch Switch Input Circuit Malfunction
- 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 P2101: Throttle Actuator Control Motor Circuit Range/Performance
- DTC P2106: Limp Home Mode - Force Limited Power
- 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 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 P2270: O2 Sensor Stuck Lean - Bank1 Sensor 2
- DTC P2271: O2 Sensor Stuck Rich - Bank1 Sensor 2
- DTC P2272: O2 Sensor Stuck Lean - Bank2 Sensor 2
- DTC P2273: O2 Sensor Stuck Rich - Bank2 Sensor 2
- DTC P2502: Charging System Voltage
- DTC P2610: ECM/PCM-Engine Off Timer Performance
- DTC U0001: High Speed CAN Communication Bus off
- DTC U0101: Lost Communication With TCM
- DTC U1111: Battery Sensor fault detected by ECU
- DTC U1112: LIN Communication Error
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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.