VAPS Solenoid Actuator Return Circuit Short To Battery
The Variable Air Intake System (VAPS) solenoid's return wire is shorted directly to battery voltage instead of ground, preventing the solenoid from deactivating properly. Think of it like a light switch stuck in the on position because the wire is touching the power supply instead of the off terminal.
The ECM monitors the return circuit voltage of the VAPS solenoid actuator, expecting it to switch between ground (0V when active) and battery voltage (12V when inactive). A short to battery creates a continuous high voltage condition on the return line, preventing normal solenoid switching and signaling a fault.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Return Circuit Voltage | 0V when solenoid energized, 12V when de-energized | Stuck at 12V or above threshold when solenoid should be active |
| Solenoid Control Signal | PWM switching 0-12V | Unable to achieve 0V ground state due to short |
Code C1927 is classified as a serious fault. If your check engine light is flashing — not just steady — pull over safely and do not continue driving. A flashing CEL indicates an active misfire or critical failure that can cause catalytic converter damage within minutes or permanent engine harm within miles. Contact a certified mechanic immediately. Do not attempt roadside repairs on high-severity codes unless you are trained to do so.
Once the fault is repaired, C1927 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.