What does it mean?
This P0506 code is one that is sometimes triggered on vehicles equipped with electronic throttle control. In other words, they do not 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 P0506 DTC (diagnostic trouble code) is triggered when the PCM (powertrain control module) detects an engine idle speed lower than the desired (preprogrammed) speed.
Potential Symptoms
The only thing you will likely notice is that the idle is lower than normal, so it will probably be rougher. There are also other symptoms. Of course, when trouble codes are set, the MIL (malfunction indicator lamp, such as the check engine light) illuminates.
A P0506 DTC trouble code can be caused by one or more of the following:
- A vacuum leak
- An air restriction in the intake or exhaust air path
- A faulty positive crankcase ventilation (PCV) valve
- Damaged/failed/dirty throttle body
- Internal engine problem
- PCM has failed
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 for vacuum leaks, restrictions, and damage. If there are no symptoms other than the DTC itself, simply clear the code and see if it returns.
Other related DTCs: P0505, P0507