C1424: LF Shock Actuator Circuit Open
The C1424 code indicates that the Suspension Control Module (SCM) or Chassis Control Module has detected an open circuit in the left front shock absorber actuator. This means there is no electrical continuity between the module and the shock's solenoid valve, preventing active adjustment of suspension firmness at that wheel.
1. Commonly Affected Makes
2. Most Common Causes
- Damaged left front shock actuator/solenoid (open coil)
- Open, cut, or corroded wiring or connector at the LF shock
- Loose connection or retracted pins in the shock or module connector
- Internal failure of the Suspension Control Module (SCM)
3. Symptoms You Will Notice
- Illuminated Check Engine or Suspension Warning Light
- Reduced ride quality or uneven suspension stiffness
4. Step-by-Step Diagnosis
Scan for codes and verify C1424 is present.
Visually inspect the LF shock actuator wiring and connector for damage, corrosion, or loose pins.
Test the actuator solenoid resistance with a multimeter; compare to specifications (typically 2–10 ohms).
Check for continuity between the SCM connector and the actuator connector.
If wiring and actuator are good, suspect a faulty SCM and perform module self-test or replacement.
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, but the suspension will not adjust properly, leading to a firmer or uneven ride. Have it diagnosed soon to avoid further issues.
How much does it cost to fix?▼
Typically $150–$400 for actuator replacement, or $200–$600 if wiring repair is needed. Module replacement can exceed $800.