VAPS Solenoid Return Circuit Short to Battery
The C1927 code indicates a short to battery voltage in the return circuit of the Variable Assist Power Steering (VAPS) solenoid actuator. The chassis control module or power steering control module continuously monitors the electrical state of the solenoids that regulate hydraulic steering pressure. When the module detects abnormally high voltage (near battery voltage) on the solenoid return circuit when it should be near 0 volts (ground reference), it sets this fault code. This means there is a current leak into the return circuit, preventing the solenoid from de-energizing properly, which affects the speed-sensitive variable steering assist.
1. Commonly Affected Makes
2. Most Common Causes
- Short to battery voltage in the VAPS solenoid return circuit wiring harness
- Internally damaged or shorted VAPS actuator solenoid
- Corroded, bent, or pushed-back terminals in the solenoid electrical connector
- Wiring rubbing against the body or power cables causing a short
- Faulty Power Steering Control Module (PSCM) with internal circuit driver failure
3. Symptoms You Will Notice
- Inconsistent or loss of variable power steering assist
- Steering feels heavy at low speeds or overly light at high speeds
- Check Engine Light or Power Steering Warning Light illuminated
4. Step-by-Step Diagnosis
Scan for codes and verify C1927 is present; check for related codes.
Visually inspect the VAPS solenoid connector and wiring for damage, corrosion, or shorts.
Measure voltage on the solenoid return circuit with key on, engine off; should be near 0V. If near battery voltage, suspect a short to power.
Disconnect the solenoid and recheck voltage; if voltage drops to 0V, the solenoid is likely shorted internally.
If voltage remains high with solenoid disconnected, trace the wiring harness for a short to battery or test the PSCM output.
5. Frequently Asked Questions
Is it safe to drive?▼
No, it is not safe to drive. The fault can cause sudden changes in steering assist, increasing the risk of loss of control. Have the vehicle towed to a repair shop.
How much does it cost to fix?▼
Repair costs typically range from $150 to $600, depending on whether the issue is a simple wiring repair or requires replacing the VAPS solenoid or power steering control module.