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Diagnostic Trouble Code Chart

WARNING: This page is about a different car, the 2004 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
DTC INDEX

DTC Description
DTC P0500, P0503  VEHICLE SPEED SENSOR CIRCUIT MALFUNCTION, VEHICLE SPEED SENSOR CIRCUIT MALFUNCTION
DTC P0571  STOP LIGHT SWITCH CIRCUIT MALFUNCTION
DTC P0607  INPUT SIGNAL CIRCUIT MALFUNCTION
DTC P1615, U1101  COMMUNICATION ERROR FROM DISTANCE CONTROL ECU TO ECM, LOST COMMUNICATION WITH DISTANCE CONTROL ECU
DTC P1616, U0100  COMMUNICATION ERROR FROM ECM TO DISTANCE CONTROL ECU, LOST COMMUNICATION WITH ECM/PCM "A"
DTC P1617  DISTANCE CONTROL ECU MALFUNCTION
DTC P1630, U0122  COMMUNICATION ERROR FROM VSC TO ECM, LOST COMMUNICATION WITH VEHICLE DYNAMIC CONTROL MODULE
DTC P1631, U0100  COMMUNICATION ERROR FROM ECM TO VSC, LOST COMMUNICATION WITH ECM/PCM "A"
DTC P1575  WARNING BUZZER MALFUNCTION
DTC P1578  BRAKE SYSTEM MALFUNCTION
DTC U0235  LOST COMMUNICATION WITH CRUISE CONTROL FRONT DISTANCE RANGE SENSOR
DTC U1102  LOST COMMUNICATION WITH RADAR SENSOR
DTC P1570  RADAR SENSOR MALFUNCTION
DTC P1572  IMPROPER AIMING OF RADAR SENSOR BEAM AXIS
DTC U0126  LOST COMMUNICATION WITH STEERING ANGLE SENSOR MODULE
DTC U0123  LOST COMMUNICATION WITH YAW RATE SENSOR MODULE

HINT:

If a trouble code is displayed during the DTC check, check the circuit listed for that code. For details of each code, refer to the "See" under the respective "DTC No." in the DTC chart.

DIAGNOSTIC TROUBLE CODE CHART

DTC No. (See) Circuit Inspection Trouble Area
P0500 ( DTC P0500 VEHICLE SPEED SENSOR CIRCUIT MALFUNCTION, DTC P0503 VEHICLE SPEED SENSOR CIRCUIT MALFUNCTION ) Vehicle speed sensor circuit malfunction
  • Combination meter
  • Vehicle speed sensor
  • Vehicle speed sensor signal circuit
  • ECM
P0503 ( DTC P0500 VEHICLE SPEED SENSOR CIRCUIT MALFUNCTION, DTC P0503 VEHICLE SPEED SENSOR CIRCUIT MALFUNCTION ) Vehicle speed sensor circuit malfunction
  • Combination meter
  • Vehicle speed sensor
  • Vehicle speed sensor signal circuit
  • ECM
P0571 ( DTC P0571 STOP LIGHT SWITCH CIRCUIT MALFUNCTION ) Stop light switch circuit malfunction
  • Stop lamp switch assy
  • Stop lamp switch signal assy circuit
  • Driver side J/B ECU
  • ECM
P0607 ( DTC P0607 INPUT SIGNAL CIRCUIT MALFUNCTION ) Input signal circuit malfunction
  • ECM (This DTC indicates a malfunction in the ECM. When this DTC is output, it is necessary to replace the ECM.)
P1615 ( DTC P1615 COMMUNICATION ERROR FROM DISTANCE CONTROL ECU TO ECM, DTC U1101 LOST COMMUNICATION WITH DISTANCE CONTROL ECU ) Communication error from distance control ECU to ECM
  • Communication circuit
  • Cruise control ECU (Distance control ECU)
  • ECM
P1616 ( DTC P1616 COMMUNICATION ERROR FROM ECM TO DISTANCE CONTROL ECU, DTC U0100 LOST COMMUNICATION WITH ECM/PCM "A" ) Communication error from ECM to distance control ECU
  • Communication circuit
  • Cruise control ECU (Distance control ECU)
  • ECM
P1617 ( DTC P1617 DISTANCE CONTROL ECU MALFUNCTION ) Distance control ECU malfunction
  • Cruise control ECU (Distance control ECU)
P1630 ( DTC P1630 COMMUNICATION ERROR FROM VSC TO ECM, DTC U0122 LOST COMMUNICATION WITH VEHICLE DYNAMIC CONTROL MODULE ) Communication error from VSC to ECM
  • Communication circuit
  • ABS & traction actuator assy (Skid control ECU)
  • ECM
P1631 ( DTC P1631 COMMUNICATION ERROR FROM ECM TO VSC, DTC U0100 LOST COMMUNICATION WITH ECM/PCM "A" ) Communication error from ECM to VSC
  • Communication circuit
  • ABS & traction actuator assy (Skid control ECU)
  • ECM
P1575 ( DTC P1575 WARNING BUZZER MALFUNCTION ) Warning buzzer malfunction
  • Skid control buzzer assy
  • Skid control buzzer circuit
  • ABS & traction actuator assy (Skid control ECU)
P1578 (*1) ( DTC P1578 BRAKE SYSTEM MALFUNCTION ) Brake system malfunction
  • VSC system
U0235 ( DTC U0235 LOST COMMUNICATION WITH CRUISE CONTROL FRONT DISTANCE RANGE SENSOR ) Lost communication with cruise control front distance range sensor
  • Communication circuit
  • Laser sensor
  • Cruise control ECU (Distance control ECU)
U1102 ( DTC U1102 LOST COMMUNICATION WITH RADAR SENSOR ) Lost communication with radar sensor
  • Communication circuit
  • Laser sensor
  • Cruise control ECU (Distance control ECU)
P1570 ( DTC P1570 RADAR SENSOR MALFUNCTION ) Radar sensor malfunction
  • Laser sensor
P1572 ( DTC P1572 IMPROPER AIMING OF RADAR SENSOR BEAM AXIS ) Improper aiming of radar sensor beam axis
  • Laser sensor
U0100 ( DTC P1616 COMMUNICATION ERROR FROM ECM TO DISTANCE CONTROL ECU, DTC U0100 LOST COMMUNICATION WITH ECM/PCM "A" ) Lost communication with ECM/PCM "A"
  • Communication circuit
  • Cruise control ECU (Distance control ECU)
  • ECM
U0100 ( DTC P1631 COMMUNICATION ERROR FROM ECM TO VSC, DTC U0100 LOST COMMUNICATION WITH ECM/PCM "A" ) Lost communication with ECM/PCM "A"
  • Communication circuit
  • ABS & traction actuator assy (Skid control ECU)
  • ECM
U0126 ( DTC U0126 LOST COMMUNICATION WITH STEERING ANGLE SENSOR MODULE ) Lost communication with steering angle sensor module
  • Communication circuit
  • Steering sensor
  • Cruise control ECU (Distance control ECU)
  • ECM
U0123 ( DTC U0123 LOST COMMUNICATION WITH YAW RATE SENSOR MODULE ) Lost communication with yaw rate sensor module
  • Communication circuit
  • Yaw rate sensor
  • Cruise control ECU (Distance control ECU)
  • ECM
U1101 ( DTC P1615 COMMUNICATION ERROR FROM DISTANCE CONTROL ECU TO ECM, DTC U1101 LOST COMMUNICATION WITH DISTANCE CONTROL ECU ) Lost communication with distance control ECU
  • Communication circuit
  • Cruise control ECU (Distance control ECU)
  • ECM
U0122 ( DTC P1630 COMMUNICATION ERROR FROM VSC TO ECM, DTC U0122 LOST COMMUNICATION WITH VEHICLE DYNAMIC CONTROL MODULE ) Lost communication with vehicle dynamic control module
  • Communication circuit
  • ABS & traction actuator assy (Skid control ECU)
  • ECM

HINT:

*: When DTC P1578 is output, check for DTCs on the skid control ECU in the diagnosis mode. Only when the DTC.