{"id":46114,"date":"2022-09-06T11:57:10","date_gmt":"2022-09-06T11:57:10","guid":{"rendered":" https:\/\/dev.way.com\/blog\/?p=46114"},"modified":"2022-09-06T11:57:10","modified_gmt":"2022-09-06T11:57:10","slug":"p0508-error-code","status":"publish","type":"post","link":"https:\/\/dev.way.com\/journal\/p0508-error-code\/","title":{"rendered":"P0508 Error Code : Causes, Symptoms, Diagnosis, Fixes and Cost"},"content":{"rendered":"

Idle Air Control Circuit Low leads to the error code P0508. This indicates that the idle air control system circuit is too low, causing inconsistency in the engine’s idle RPM. Read to know more about the P0508 error code.<\/em><\/p>\n

This is a generic error code, applicable to all OBD-II-equipped vehicles manufactured between 1996 and the present. It is a common error seen among Chrysler, Dodge, Hyundai, Mazda, and Jeep models. The troubleshooting and repair procedures will vary depending on the vehicle’s make and model.<\/span>\u00a0<\/span><\/p>\n

What is the P0508 error code?<\/span>\u00a0<\/span><\/h2>\n

A linear servomotor controls a plunger that regulates the amount of air allowed to bypass the throttle plate and enter the intake manifold as part of the IAC system. Having control over the amount of air allowed to bypass the throttle plate aids in regulating the engine’s idle RPM.<\/span><\/p>\n

When the throttle plate is idle, the throttle body allows very little air to enter the engine. This amount of air is insufficient for the engine to continue idling, and it will certainly stall. A source of supplementary air (vacuum) is required for the engine to continue to idle with the throttle plate closed. <\/span>\u00a0<\/span><\/p>\n

Obviously, when the throttle plate is opened, the auxiliary vacuum source would be detrimental to engine performance and fuel economy (upon acceleration). Hence the requirement for a PCM-controlled vacuum source with complete adjustability. The plunger housing of the IAC valve is designed with two separate air passageways.<\/span>\u00a0<\/span><\/p>\n

\"p0508<\/p>\n

Source : Amazon<\/a><\/em><\/p>\n

Typically, the IAC valve is attached to the intake manifold near or on the throttle body. It is positioned so that ambient air can flow through it and into the manifold when it is open (when the plunger moves out of the opening), but cannot flow through it when it is closed (when the plunger fills the opening). <\/span>\u00a0<\/span><\/p>\n

The IAC is in constant motion, controlled by the PCM. The PCM determines how much air should be permitted to bypass the throttle plate based on input signals from the oxygen sensors, throttle position sensor, and other sensors. <\/span>As the PCM adjusts voltage and ground signals to the IAC valve, the valve responds accordingly. If the engine RPM levels do not correspond with the programmed limits, the code P0508 will be stored and the MIL may illuminate.<\/span>\u00a0<\/span><\/p>\n

Causes<\/span>\u00a0<\/span><\/h2>\n