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 DIAGNOSISTRANSMISSIONAUTOMATIC TRANSAUTOMATIC TRANSMISSION DIAGNOSIS
2011 Hyundai Equus Signature
Automatic Transmission Diagnosis
2011 Hyundai Equus SignatureSECTION Automatic Transmission Diagnosis
- Diagnostic Trouble Code Index
- DTC P0120: Throttle/Pedal Position Sensor/Switch 'A' Circuit
- DTC P0219: Engine Overspeed Condition
- DTC P0603: Internal Control Module Keep Alive Memory (KAM) Error
- DTC P0605: Internal Control Module Read Only Memory (ROM) Error
- DTC P0607: Control Module Performance
- DTC P0616: Starter Relay Circuit Low
- DTC P0634: PCM/ECM/TCM Internal Temperature Too High
- DTC P0641: Sensor Reference Voltage 'A' Circuit/Open
- DTC P0642: Sensor Reference Voltage 'A' Circuit Low
- DTC P0666: PCM/ECM/TCM Internal Temperature Sensor Circuit
- DTC P0667: PCM/ECM/TCM Internal Temperature Sensor Range/Performance
- DTC P0703: Stop Lamp (Brake) Switch Circuit Malfunction
- DTC P0705: Transmission Range Sensor Circuit Malfunction (PRNDL Input)
- DTC P0706: Transmission Range Sensor Circuit Range/Performance
- DTC P0707: Transmission Range Sensor Circuit Low Input
- DTC P0708: Transmission Range Sensor Circuit High Input
- DTC P0710: Transmission Fluid Temperature Sensor 'A' Circuit
- DTC P0711: Transmission Fluid Temperature Sensor 'A' Circuit Range/Performance
- DTC P0712: Transmission Fluid Temperature Sensor 'A' Circuit Low Input
- DTC P0713: Transmission Fluid Temperature Sensor 'A' Circuit High Input
- DTC P0716: Input/Turbine Speed Sensor 'A' Circuit Range/Performance
- DTC P0717: Input/Turbine Speed Sensor 'A' Circuit No Signal
- DTC P0721: Output Speed Sensor Circuit Range/Performance
- DTC P0722: Output Speed Sensor Circuit No Signal
- DTC P0727: Engine Speed Input Circuit No Signal
- DTC P0729: Gear 6 Incorrect Ratio
- DTC P0731: Gear 1 Incorrect Ratio
- DTC P0732: Gear 2 Incorrect Ratio
- DTC P0733: Gear 3 Incorrect Ratio
- DTC P0734: Gear 4 Incorrect Ratio
- DTC P0735: Gear 5 Incorrect Ratio
- DTC P0736: Reverse Incorrect Ratio
- DTC P0741: Torque Converter Clutch Circuit Stuck Off (SOL6)
- DTC P0743: Torque Converter Clutch Circuit - Short to battery (SOL6)
- DTC P0744: Torque Converter Clutch Circuit - Open or Short to ground (SOL6)
- DTC P0746: Pressure Control Solenoid Valve 'A' Performance or Stuck Off (SOL5)
- DTC P0748: Pressure Control Solenoid Valve 'A' - Short to Battery (SOL5 - Normal/High)
- DTC P0749: Pressure Control Solenoid Valve 'A' - Short to ground (SOL5 - Normal/High)
- DTC P0751: Shift Control Solenoid Valve 'A' Performance or Stuck Off (SOL1- Clutch 'A': Normal/Low)
- DTC P0753: Shift Control Solenoid Valve 'A' - Short to battery (SOL1- Clutch 'A': Normal/Low)
- DTC P0754: Shift Control Solenoid Valve 'A' - Open or Short to ground (SOL1-Clutch 'A' - Normal/Low)
- DTC P0756: Shift Control Solenoid Valve 'B' Performance or Stuck Off (SOL2)
- DTC P0758: Shift Control Solenoid Valve 'B' - Short to battery (SOL2-Clutch B: Normal/High)
- DTC P0759: Shift Control Solenoid Valve 'B' Intermittent (SOL2)
- DTC P0761: Shift Control Solenoid Valve 'C' Performance or Stuck Off (SOL3)
- DTC P0763: Shift Control Solenoid Valve 'C' - Short to battery (SOL3 - Brake 'C': Normal/Low)
- DTC P0764: Shift Control Solenoid Valve 'C'-Open or Short to ground (SOL3 - Brake 'C': Normal/Low)
- DTC P0766: Shift Control Solenoid Valve 'D' Performance or Stuck Off (SOL4)
- DTC P0768: Shift Control Solenoid Valve 'D' - Short to battery (SOL4- Brake 'D', Clutch 'E' - Normal/High)
- DTC P0769: Shift Control Solenoid Valve 'D' - Open or Short to ground (SOL4- Brake'D', Clutch'E': Normal/High)
- DTC P0771: Shift Control Solenoid Valve 'E' - Open (SOL 7 - ON/OFF: Normal/Close)
- DTC P0773: Shift Control Solenoid Valve 'E' - Short to battery (SOL 7 - ON/OFF: Normal/Close)
- DTC P0774: Shift Control Solenoid Valve 'E' - Short to ground (SOL 7 - ON/OFF: Normal/Close)
- DTC P0781: 1-2 Shift
- DTC P0782: 2-3 Shift
- DTC P0783: 3-4 Shift
- DTC P0784: 4-5 Shift
- DTC P0829: 5-6 Shift
- DTC P0880: TCM Power Signal Error Open/Short (GND)
- DTC P0889: TCM Power Supply to Solenoid Circuit Range/Performance
- DTC P0890: TCM Power Relay Circuit Low
- DTC P0891: TCM Power Relay Circuit High
- DTC P0892: TCM Power Supply to Solenoid Valve Circuit - Open
- DTC P0905: Gate Select Position Circuit Range/Performance
- DTC P0924: Gear Shift Reverse Actuator Circuit/Open
- DTC P0926: Gear Shift Reverse Actuator Circuit Low
- DTC P0927: Gear Shift Reverse Actuator Circuit High
- DTC P0928: Gear Shift Lock Solenoid Control Circuit Open
- DTC P0930: Gear Shift Lock Solenoid Control Circuit Low
- DTC P0931: Gear Shift Lock Solenoid Control Circuit High
- DTC P2637: Torque Management Feedback Signal 'A'
- DTC P2700: Transmission Friction Element "A" Apply Time Range/Performance
- DTC P2701: Transmission Friction Element "B" Apply Time Range/Performance
- DTC P2702: Transmission Friction Element "C" Apply Time Range/Performance
- DTC P2703: Transmission Friction Element "D" Apply Time Range/Performance
- DTC P2704: Transmission Friction Element "E" Apply Time Range/Performance
- DTC U0001: High Speed CAN Communication Bus off
- DTC U0100: Lost Communication With ECM/PCM 'A'
- DTC U0104: Lost Communication With Cruise Control Module
- DTC U0121: Lost Communication With Anti-Lock Brake System (ABS) Control Module
- DTC U0122: Lost Communication With Vehicle Dynamics Control Module
- DTC U0126: Lost Communication With Steering Angle Sensor Module
RENDER: 1.0x
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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.