P0507 on Ford: How to Diagnose & Fix
Idle Air Control System RPM Higher Than Expected
2 Ford models · 2 documented issues · 1 critical · $50-$300 repair
P0507 on Ford by model: symptoms, diagnosis and fix
Multiple 2017-2020 Transit Connect owners report intermittent stalling at idle or during low-speed maneuvers, traced to PCM software calibration issues. The engine drops RPMs erratically and stalls, particularly when the AC compressor engages or when transitioning from reverse to drive. Ford released TSB 19-2346 addressing this with an updated PCM calibration, but many vehicles remain unflashed.
Common Symptoms
- Engine stalls at idle, especially in drive with foot on brake
- RPM drops below 500 then recovers or stalls
- Stalling when shifting from reverse to drive
- Stalling when AC compressor kicks on
- Check engine light with idle-related codes
How to Fix
Dealer PCM reflash/recalibration per Ford TSB 19-2346. The updated calibration adjusts idle air control parameters and torque converter clutch engagement logic. If stalling persists after reflash, inspect the throttle body for carbon buildup and clean with CRC throttle body cleaner. A failing throttle position sensor can produce similar symptoms and should be ruled out.
Sources for this issue (1)
The IAC valve becomes clogged with carbon deposits, causing erratic idle speed, stalling at stops, and surging idle. Particularly common on 5.4L and 4.6L Triton engines in fleet vehicles with frequent stop-and-go use.
Common Symptoms
- Erratic idle speed
- Stalling at stops
- Idle surging
- High idle
How to Fix
Clean the IAC valve and throttle body with intake cleaner. Replace the IAC valve if cleaning doesn't resolve the issue. Inspect the throttle body gasket.
Sources for this issue (1)
P0507 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0507 mean on a Ford?
P0507 stands for "Idle Air Control System RPM Higher Than Expected." This code means the engine is idling faster than the computer's target idle speed, typically by a set margin such as 200 RPM above commanded. The engine control module manages idle by metering a small amount of air around the throttle plate (via an idle air control valve or electronic throttle), and when it can't bring the RPM down to target it flags this code. The most common real cause is unmetered air sneaking into the intake — a vacuum leak — that the computer can't compensate for. It generally indicates extra air entering the engine or a problem with the idle/throttle control system. On Ford it is documented across 2 models: Transit Connect, E-Series.
What are the most common causes of P0507?
The most common causes of P0507 are: Vacuum or intake air leak (hoses, gaskets, intake boot), Dirty or sticking throttle body or throttle plate, Faulty or stuck idle air control valve, Leaking intake manifold or throttle body gasket, Stuck-open PCV valve or cracked PCV hose, Dirty mass airflow sensor giving false readings, Failing throttle position sensor, Leaking brake booster or its vacuum hose. The specific cause varies by vehicle.
How much does it cost to fix P0507 on a Ford?
Published repair estimates on Ford range from $50 to $300 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0507 on a different make?
View P0507 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.