P0507 P0xxx · Powertrain (P) Medium severity
Idle Control System RPM Higher Than Expected
The engine idles above the target speed and the ECU cannot bring it down. Either extra air is getting in, or the throttle is not closing as commanded.
Severity guidance: Medium — drivability or emissions affected, book it in this week
Symptoms you will notice
- High idle
- Engine racing between gear changes
- Poor fuel economy
- Hard to select gear smoothly
Common causes
Ordered from most to least likely — start at the top.
- 1 Vacuum leak after the throttle body
- 2 Dirty throttle body holding the plate open
- 3 Failed idle control valve
- 4 Stuck accelerator pedal or cable
- 5 Intake manifold gasket leak
How to diagnose it
Cheapest and least invasive first — most of these codes are not a parts problem.
- ✓ Check for unmetered air with a smoke test — this is the fastest route.
- ✓ Inspect and clean the throttle body bore and plate edges.
- ✓ Watch the commanded vs actual throttle position in live data.
- ✓ Confirm the throttle learns correctly after cleaning (relearn procedure).
Repair options
- Repair the vacuum leak
- Clean the throttle body and perform the relearn
- Replace the idle control valve
P0507 — frequently asked questions
Why did it start after I cleaned the throttle? +
Cleaning removes the carbon the ECU had adapted to. Run the throttle relearn so the plate position matches the new airflow.
Is a high idle harmful? +
It wastes fuel and makes gear engagement harsh. Over time it also wears the driveline.
Confirm the diagnosis before you buy parts
Send us the code, freeze-frame data and the vehicle — our engineers will tell you what to test first.