LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2023 >> QX55 Essential >> Repair and Diagnosis (Single Page) >> Steering >> Steering Control Systems >> Steering Control System (Electric Power Steering) >> Ecu Diagnosis Information >> EPS Control Unit >> DTC Inspection Priority Chart
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC Inspection Priority Chart

When multiple DTCs are detected simultaneously, check one by one depending on the following priority list:

Priority

Priority order item (DTC)

1

  • C1601 BATTERY VOLT

2

  • C1602 NO TUNING SET
  • C1604 TORQUE SENSOR
  • C1606 EPS MOTOR
  • C1607 EEPROM
  • C1608 CONTROL UNIT
  • U0405 ADAS CAN CIR 1

3

  • C1143 ST ANG SEN CIRCUIT
  • C1609 CAN VHCL SPEED
  • C1A50 ADAS MALFUNCTION
  • U0401 ECM CAN CIR 1
  • U140E Chassis control module

4

  • U1000 CAN COMM CIRCUIT
  • U1010 CONTROL UNIT (CAN)