What does P0507 mean?
This diagnostic trouble code (DTC) is a generic powertrain code, meaning it applies to vehicles equipped with OBD-II. Although generic, specific repair steps may vary by make/model. Anecdotally, this code appears to be more common on Chevrolet, VW, Nissan, Audi, Hyundai, Honda, Mazda, and Jeep vehicles.
This P0507 code is one that is sometimes triggered on vehicles with electronic throttle control. In other words, they don’t have a regular accelerator cable from the accelerator pedal to the engine. They rely on sensors and electronics to control the throttle.
In this case, the P0507 DTC (diagnostic trouble code) is triggered when the PCM (powertrain control module) detects an engine idle speed higher than the desired (pre-programmed) speed. For GM vehicles (and possibly others), if the idle speed is more than 200 RPM higher than expected, this code will be set.
An example of an idle air control valve (IAC):
Symptoms
potential
You will most likely notice that the idle speed is higher than normal. There are also other symptoms. Of course, when trouble codes are set, the MIL (malfunction indicator lamp, such as the check engine light) illuminates.
Causes
A P0507 DTC trouble code can be caused by one or more of the following:
A vacuum leak
Air intake leak after the throttle body
EGR valve leaking vacuum
A faulty positive crankcase ventilation (PCV) valve
Damaged/failed/dirty throttle body
Failing EVAP system
Faulty IAC (idle air control) valve or faulty IAC circuit
Possible Solutions
This DTC is more of an informational code, so if there are other codes set, diagnose them first. If there are no other codes, inspect the air intake system for air or vacuum leaks and damage. If there are no symptoms other than the DTC itself, simply clear the code and see if it returns.
If you have an advanced scan tool that can interact with the car, command the idle higher and lower to see if the engine responds correctly. Also check the PCV valve to see if it’s stuck and needs replacement. Check the IAC (idle air control) valve if applicable, verify its operation. If available, try swapping in a new throttle body to see if that resolves the issue. On Nissan Altimas and possibly other vehicles, the problem may be resolved by having the dealer perform an idle relearn procedure or other relearn procedures.