C1425: RR Shock Solenoid Short to Ground
Diagnostic trouble code C1425 indicates a short-to-ground fault in the circuit for the right rear shock absorber solenoid in Toyota/Lexus vehicles equipped with active or semi-active suspension. The suspension control module detects abnormally low resistance or near-zero voltage on the solenoid control circuit, pointing to a short to ground in the wiring or the solenoid itself. This disables active suspension control, often triggering a warning light and forcing the suspension into a fixed-stiffness fail-safe mode.
1. Commonly Affected Makes
2. Most Common Causes
- Damaged insulation on the RR shock solenoid wiring, chafing against the chassis
- Corroded or moisture-contaminated connector at the right rear shock absorber
- Internal short circuit within the RR shock solenoid
- Damaged wiring harness between the suspension control module and the RR shock
- Faulty suspension control module (less common)
3. Symptoms You Will Notice
- Suspension warning light illuminated on the dashboard
- Suspension operates in a fixed, often stiffer, fail-safe mode
4. Step-by-Step Diagnosis
Scan for codes and verify C1425 is present
Visually inspect the RR shock wiring and connector for damage, corrosion, or chafing
Measure resistance between the solenoid control wire and ground; a very low reading confirms a short
Disconnect the RR shock connector and check if the short clears; if so, the solenoid is faulty
If the short persists, inspect the harness from the module to the shock for damage
As a last step, test the suspension control module output or swap with a known-good module
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, but the suspension will be locked in a fixed stiffness mode, reducing ride comfort and handling. Have it repaired soon to restore normal function.
How much does it cost to fix?▼
Typically $200–$600, depending on whether it's a wiring repair ($100–$300) or shock absorber replacement ($400–$800).