C0240high severityChassis
Active Steering System Malfunction
on 2007 Lexus GS 430 4.3L V8 · RWD
What this code means
General fault in the active steering system that adjusts steering ratio based on vehicle speed.
Symptoms
- Active steering warning light
- Fixed steering ratio
- Steering feels different at various speeds
- Driver assist features limited
Common causes
- Active steering motor failure
- Control module fault
- Position sensor malfunction
- CAN communication error
Diagnostic steps
- Scan for active steering module codes
- Test active steering motor
- Check CAN communication to module
- Inspect wiring and connectors
- Test position feedback sensors
Repair notes
Diagnose specific active steering component. System defaults to fixed ratio when faulted.
Other Chassis codes on this vehicle
C0021
LF Wheel Speed Sensor Range/Performance
C0022
RF Wheel Speed Sensor Range/Performance
C0023
LR Wheel Speed Sensor Range/Performance
C0024
RR Wheel Speed Sensor Range/Performance
C0025
LF Wheel Speed Sensor Circuit Intermittent
C0026
RF Wheel Speed Sensor Circuit Intermittent
C0027
LR Wheel Speed Sensor Circuit Intermittent
C0028
RR Wheel Speed Sensor Circuit Intermittent
C0035
Left Front Wheel Speed Sensor Circuit
C0036
Left Front Wheel Speed Signal Erratic