P0507 Idle Air Control System RPM Higher Than Expected
Description and meaning of DTC p0507
This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. Although generic, the specific repair steps may vary depending on make/model. Acedotally this code seems to be more commonly found on Chevrolet, VW, Nissan, Audi, Hyundai, Honda, Mazda and Jeep vehicles. This P0507 code is one that's sometimes triggered on vehicles that have electronic throttle control. That is, they don't have a regular throttle cable from theaccelerator pedal to the engine. They rely on sensors and electronics to controlthe throttle. In this case, the P0507 DTC (diagnostic trouble code) is triggeredwhen the PCM (powertrain control module) detects an engine idle speed that isgreater than the desired (pre-programmed) RPM. In the case of GM vehicles (andpossibly others) if the idle speed is over 200 rpm higher than expected, thiscode will be set.
p0507 diagnostic trouble code symptoms
Most likely you'll notice the idle speed is higher than normal. There are potentiallyother symptoms as well. Of course, when trouble codes are set, the MIL (malfunctionindicator lamp, a. k. a. the check engine light) illuminates.
DTC p0507 - possible causes
A P0507 DTC trouble code may be caused by one or more of the following:A vacuum leak Leaking air intake after the throttle bodyEGR valve leaking vacuumA faulty positive crankcase ventilation (PCV) valveDamaged/failed/dirty throttle bodyFailed EVAP systemFailed IAC (idle air controller) or faulty IAC circuit
How to fix OBD-II diagnostic trouble code p0507
This DTC is more of an informational code, so if there are any other codesset, diagnose them first. If there are no other codes, inspect the intake airsystem for air or vacuum leaks and damage. If there are no symptoms other thanthe DTC itself, just clear the code and see whether it returns. If you have an advanced scan tool that can interact with the car, command theidle higher and lower to see if the engine responds appropriately. Also checkthe PCV valve to see if it's blocked and needs to be replaced. Check the IAC(idle air controller) if equipped, verify it's operation. If available, tryswapping in a new throttle body to see if that fixes the problem. On NissanAltimas and possibly other vehicles the problem may be fixed by having the dealerperform an idle air relearn procedure, or other relearn procedures.