What does code P1516 mean?

Q: What does code P1516 mean?

Idle Air Control Solenoid Signal 4 Circuit Low Input. P1516 on a Subaru means the engine control module (ECM) has detected a low input signal on the idle air control (IAC) solenoid's fourth circuit, which is one of the control wires for the IAC valve. The ECM expects a specific voltage or current on that circuit when commanding the valve, and a low reading indicates a short to ground, an open circuit, or a faulty solenoid winding.

DTC codes / Subaru codes / P1516

P1516 · SubaruIdle Air Control Solenoid Signal 4 Circuit Low Input

P1516 on a Subaru means the engine control module (ECM) has detected a low input signal on the idle air control (IAC) solenoid's fourth circuit, which is one of the control wires for the IAC valve. The ECM expects a specific voltage or current on that circuit when commanding the valve, and a low reading indicates a short to ground, an open circuit, or a faulty solenoid winding.

SystemPowertrain

Code typeSubaru specific

SeverityMedium

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

Guidance is general and written for Subaru vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.