What does code P1508 mean?

Q: What does code P1508 mean?

Idle Air Control Circuit Open. P1508 on a Mazda means the powertrain control module (PCM) has detected an open circuit in the idle air control (IAC) valve circuit, so it cannot command the valve to adjust idle speed. The PCM monitors the IAC circuit for expected voltage or current feedback and sets this code when the signal is missing or out of range.

DTC codes / Mazda codes / P1508

P1508 · MazdaIdle Air Control Circuit Open

P1508 on a Mazda means the powertrain control module (PCM) has detected an open circuit in the idle air control (IAC) valve circuit, so it cannot command the valve to adjust idle speed. The PCM monitors the IAC circuit for expected voltage or current feedback and sets this code when the signal is missing or out of range.

SystemPowertrain

Code typeMazda specific

SeverityMedium

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

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