P1505 Idle Air Control System at Adaptive Clip
What does P1505 mean on a Ford?
P1505 — Idle Air Control System at Adaptive Clip. This Ford-enhanced code applies to F-150, Mustang, Ranger, Explorer.
Common causes of P1505
- chronic vacuum leak forcing maximum idle correction
- Heavily carboned throttle body the PCM can no longer adapt around
- Sticking IAC valve at its travel limit
- Unmetered air from a cracked brake booster hose
- Base idle misadjusted after throttle work
How to fix P1505
- Smoke test for vacuum leaks including the booster hose
- Clean the throttle body and IAC passages thoroughly
- Reset keep-alive memory and relearn idle after repairs
- Verify base idle setting per Ford procedure
- Replace the IAC valve if it remains pinned at its limit