C1422: LF Shock Actuator Short to Ground
The C1422 code indicates that the variable suspension ECU (AVS/TEMS) has detected a short to ground in the left front shock absorber actuator circuit. This prevents electronic damping force control, forcing the system into fail-safe mode and illuminating the suspension warning light.
1. Commonly Affected Makes
2. Most Common Causes
- Short to ground in the left front shock absorber wiring harness
- Internal short circuit in the left front shock actuator coil
- Damaged, corroded, or loose connector at the shock absorber or suspension ECU
- Internal failure of the suspension control ECU (AVS/TEMS ECU)
3. Symptoms You Will Notice
- Suspension warning light on
- Reduced ride quality or harsh damping
- System stuck in fail-safe mode (firm damping)
4. Step-by-Step Diagnosis
Scan for codes and verify C1422 is present
Visually inspect left front shock actuator wiring and connector for damage, corrosion, or looseness
Measure resistance between actuator signal wire and ground; a short (near 0 ohms) confirms a short to ground
Disconnect actuator and check if short clears; if so, replace actuator; if not, repair wiring or replace ECU
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, but the suspension will be in fail-safe mode (firm damping), reducing comfort. Have it diagnosed soon to avoid further issues.
How much does it cost to fix?▼
Typically $200–$600, depending on whether the actuator ($150–$400) or ECU ($300–$800) needs replacement, plus labor.