P0507 on a 2009 Honda CR-V indicates the idle control system is idling higher than expected.
What this code means for your CR-V
How idle control works in a 2009 CR-V
On many Honda models from this era, idle speed is managed by a drive-by-wire throttle system and related sensors. A P0507 means the engine control unit (ECU) has detected an idle speed that is higher than the target idle. This can affect fuel economy, emissions, and drivability, and it may appear alongside other trouble codes guiding a diagnosis.
Common causes
The following explanations cover the most frequent reasons a P0507 might be stored in a 2009 CR-V. Check each system area when diagnosing.
- Vacuum leaks in intake hoses, intake manifold gaskets, or brake booster lines
- Dirty, sticking, or faulty idle air control valve (IAC) or throttle body (for earlier systems or separate IAC components)
- Sensor or wiring faults, especially with the Mass Air Flow (MAF) sensor or its connection
- PCV valve or hose problems that introduce extra air or leaks
- Vacuum-related issues from cracked hoses or faulty seals
- EGR valve issues or a clogged EGR system that affects idle stability
- Fuel delivery issues (low fuel pressure or contaminated fuel) that affect idle quality
- Throttle body or electronic throttle control (ETC) faults or the need for an idle relearn
In many cases, multiple factors contribute to a high idle, and a professional scan and inspection helps pinpoint the root cause beyond the code alone.
Diagnosis and common fixes
To address P0507, technicians typically follow a structured diagnostic path. The steps below outline a practical approach to identifying and fixing the issue.
- Scan for codes and monitor live data (idle speed, MAF readings, throttle position, and vacuum readings).
- Inspect vacuum hoses and seals for cracks, disconnections, or leaks; replace as needed.
- Clean the throttle body and inspect the idle air control valve or its equivalent in the drive-by-wire system; service or replace if sticking or faulty.
- Check and clean/replace the MAF sensor and ensure its wiring is intact; perform a MAF scale check if possible.
- Inspect the PCV valve and hoses; replace if gummy or clogged.
- Check for EGR valve operation, vacuum supply, and for any clog or sticky valve; clean or replace if necessary.
- Ensure there are no intake manifold or throttle body gasket leaks; use a smoke test if needed.
- After repairs, perform an idle relearn or reset procedure if the system requires it; recheck idle RPM with the engine at operating temperature.
If the P0507 persists after these steps, the vehicle should be checked by a qualified technician to rule out PCM-related issues or software updates that might be required by the manufacturer.
Symptoms to watch for
Beyond the diagnostic code, common symptoms that may accompany a high idle include:
- Engine idling higher than normal (often above the typical 600-800 RPM range)
- Rough or unstable idle
- Check Engine Light illuminated or DTCs stored
- Intermittent stalling or hiccup at idle
- Noticeable drop in fuel economy or drivetrain feel when idling
Note: On some Honda CR-V models with drive-by-wire, idle speed is controlled electronically; multiple sensors and control modules influence idle. A P0507 can be a sign of a minor vacuum leak or a more serious throttle control fault.
Summary
P0507 on a 2009 Honda CR-V signals that the idle control system is allowing the engine to idle higher than the target. The issue is commonly caused by vacuum leaks, a dirty or failing idle control valve or throttle body, sensor faults, or fuel delivery issues. A methodical diagnostic approach—starting with an scans, inspecting hoses, cleaning or replacing the IAC/throttle body, and performing an idle relearn—addresses the most frequent causes. If the problem persists, professional service is advised to ensure drivability and emissions compliance.