P0508 - OBD II Trouble Code

Our automotive experts have put together the following information about the P0508 diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P0508 code.

What Does P0508 Code Mean?

OBD-II Code P0508 is defined as a Idle Air Control System Circuit Low

The Idle Control System manages the engine idle speed. To raise or lower the engine Idle speed, the engine control module (PCM), opens or closes the Idle Air Control valve to allow more or less air into the engine. When the PCM cannot achieve the desired RPM, it will set code P0508.

P0508 Symptoms

• Engine idle speed is higher than normal
• Engine stalls when coming to a stop

Common Problems That Trigger the P0508 Code

• Clogged air filter
• Idle Air Control (IAC) valve failure
• Powertrain Control Module (PCM) failure
• Vacuum leak
• Wiring issue