VAPS Actuator Solenoid Circuit Short to Ground
The C1924 code indicates a short to ground in the output circuit of the Variable Assist Power Steering (VAPS) actuator solenoid. The VAPS system modulates steering assist based on driving conditions. When the control module detects a permanent short to ground on the solenoid output signal, it cannot properly control the power steering assist. This manufacturer-specific code (C1xxx) is documented in Ford Motor Company service manuals for vehicles equipped with VAPS. A short to ground can cause steering assist to be stuck at maximum or minimum, depending on the circuit design.
1. Commonly Affected Makes
2. Most Common Causes
- VAPS actuator solenoid with internal coil shorted to case
- Output circuit wiring damaged or chafed against chassis (short to ground)
- VAPS solenoid connector with corroded or water-contaminated pins
- VAPS control module (PSCM or equivalent) with damaged output driver
- Defective fuse or relay in the power circuit affecting ground reference
3. Symptoms You Will Notice
- Steering assist feels constant (either too light or too heavy) regardless of speed
- Steering wheel may be difficult to turn or feels overly assisted
4. Step-by-Step Diagnosis
Scan for additional codes and verify C1924 is present
Visually inspect VAPS solenoid connector and wiring for damage, corrosion, or chafing
Measure resistance between solenoid output circuit and ground; a low reading confirms short
Disconnect solenoid and check if short clears; if so, replace solenoid
If short persists, test control module output driver per service manual
5. Frequently Asked Questions
Is it safe to drive?▼
The vehicle may still be driven, but steering assist may be abnormal, making handling unpredictable. It is recommended to have the issue diagnosed and repaired promptly.
How much does it cost to fix?▼
Repair costs typically range from $150 to $600, depending on whether the solenoid, wiring, or control module needs replacement.