Variable Intake Solenoid #2 Circuit Malfunction
The engine's computer detected a wiring or electrical problem with the second variable intake valve solenoid, which controls air intake timing. Think of it like a traffic light malfunction—the signal isn't getting through properly to control the flow.
The ECM monitors the voltage and current draw of the Variable Intake Solenoid #2 circuit during operation. It checks for proper activation response, voltage drops, and continuity in the wiring harness and solenoid coil. A malfunction is detected when voltage or resistance falls outside expected operating parameters.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Solenoid coil resistance | 4-8 ohms (varies by design) | Open circuit (infinite ohms) or short (<1 ohm) |
| Circuit voltage during activation | 11-14 volts at solenoid | <5 volts or excessive voltage drop |
Code P1527 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P1527 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.