VAPS Solenoid Actuator Return Circuit Failure
The engine computer detected a broken electrical circuit in the Variable Air Intake System (VAPS) solenoid return path, like a broken wire preventing electricity from flowing back to complete the circuit. This prevents the solenoid from operating properly to control air intake.
The ECM monitors the return circuit voltage and current of the VAPS solenoid actuator after sending a control signal. It detects if the return path has excessive resistance, an open circuit, or short-to-ground condition that prevents normal current flow completion.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Return Circuit Resistance | < 10 ohms | > 15 ohms or open circuit |
| Return Circuit Voltage Drop | < 0.5V | > 1.5V or no voltage detected |
Code C1925 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, C1925 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.