C1423: LF Shock Actuator Circuit Fault
The C1423 code indicates an electrical malfunction in the left front shock absorber actuator circuit. The active suspension control module continuously monitors the actuator's resistance and feedback signal. When voltage or resistance falls outside normal parameters, this code is stored. This fault prevents the control module from properly adjusting suspension stiffness or ride height at that wheel, compromising vehicle stability and handling.
1. Commonly Affected Makes
2. Most Common Causes
- Damaged or shorted left front shock actuator
- Open or shorted wiring to the shock actuator
- Corroded or bent pins in the actuator connector
- Blown fuse or damaged relay in the suspension system
3. Symptoms You Will Notice
- Illuminated Check Engine or Suspension Warning Light
- Reduced ride quality or uneven suspension feel
- Vehicle leans or sways more than normal during turns
- Suspension fails to adjust to selected mode
4. Step-by-Step Diagnosis
Scan for codes and verify C1423 is present
Inspect left front shock actuator connector for corrosion or damage
Check wiring between actuator and control module for opens or shorts
Test actuator resistance and compare to manufacturer specs
If wiring and actuator are good, test control module power and grounds; replace module if necessary
5. Frequently Asked Questions
Is it safe to drive?▼
It is moderately safe for short distances, but handling and stability are compromised. Avoid high speeds and sharp turns until repaired.
How much does it cost to fix?▼
Repair costs typically range from $200 to $800, depending on whether the actuator, wiring, or control module needs replacement.