VAPS Solenoid Circuit Short to Battery
The C1923 code indicates that the Variable Assist Power Steering (VAPS) control module has detected a short to battery positive voltage in the solenoid actuator output circuit. This solenoid regulates hydraulic pressure to vary steering effort; a short to positive prevents proper PWM control, causing the system to default to maximum assist.
1. Commonly Affected Makes
2. Most Common Causes
- Wiring in the VAPS solenoid control circuit shorted to 12V (damaged insulation, chafing against power harness)
- VAPS solenoid connector with corrosion, bent terminals, or moisture bridging to power supply
- VAPS solenoid internal failure (coil shorted to case or power terminal)
- Power steering control module (PSCM/EBCM) with internally damaged output driver
3. Symptoms You Will Notice
- Steering feels overly light or inconsistent
- Steering assist defaults to maximum, reducing road feel
4. Step-by-Step Diagnosis
Scan for related codes and check VAPS module data
Visually inspect VAPS solenoid wiring and connector for damage or corrosion
Test solenoid resistance and check for shorts to battery voltage
Check for battery voltage on the control circuit with key on, engine off
If wiring and solenoid are good, suspect a faulty PSCM/EBCM
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, but steering will have maximum assist, reducing road feel. Have it diagnosed soon to avoid potential loss of assist.
How much does it cost to fix?▼
Typically $150–$400, depending on whether the solenoid, wiring, or control module needs replacement.