What are the symptoms of P0507?

High idle — 1,000–2,500 RPM at warm idle when in park. Engine surges and hunts at idle. Transmission clunk into Drive — higher than normal idle RPM at stop

Inspect intake boot for cracks, especially near throttle body clamps. Remove and clean throttle body with throttle body cleaner — do NOT use carburetor cleaner on MAF. Perform throttle body relearn procedure after cleaning (many GM/Toyota models require it). Test IAC valve resistance (spec: 10–14 Ω typical); replace if out of spec

P0507

Idle Air Control System RPM High

🟡 SERVICE SOON POWERTRAIN · Idle Control

PCM commanded idle RPM is lower than actual idle speed — engine idles faster than target.

What You'll Notice

High idle — 1,000–2,500 RPM at warm idle when in park
Engine surges and hunts at idle
Transmission clunk into Drive — higher than normal idle RPM at stop

Probable Causes

Vacuum leak (most common) — cracked intake boot, disconnected vacuum line
Dirty throttle body — carbon buildup preventing blade from seating
IAC (idle air control) valve stuck open
Throttle body actuator fault (electronic throttle — DBW vehicles)

Direct Repair Steps

Inspect intake boot for cracks, especially near throttle body clamps
Remove and clean throttle body with throttle body cleaner — do NOT use carburetor cleaner on MAF
Perform throttle body relearn procedure after cleaning (many GM/Toyota models require it)
Test IAC valve resistance (spec: 10–14 Ω typical); replace if out of spec

Vehicles Affected

honda toyota nissan chevy ford