What is the code P0507 on a 2015 Honda Accord?

The P0507 code means the idle control system is commanding an idle speed higher than the engine computer expects. On a 2015 Honda Accord, this typically shows up as a faster-than-normal idle when the car is at rest, even though the ECU is trying to hold a lower idle.

What P0507 means for a 2015 Honda Accord

P0507 is an OBD-II generic code that signals the engine’s idle speed is higher than the target the ECU expects. In Hondas, idle speed is controlled by the electronic throttle body and related circuitry rather than a stand-alone idle control valve. When the measured idle RPM stays above the commanded idle by a defined threshold, the PCM sets P0507. This can indicate air intake issues, sensor faults, or contamination in the idle pathway that keeps the throttle plate from closing as needed.

Common causes of P0507 on a 2015 Accord

Several issues can trigger a high-idle code in this model, often related to air flow, vacuum, or sensor data. The most frequent culprits include the following:

• Vacuum leaks in the intake manifold, hoses, or gaskets


• Dirty, sticky, or carbon-build-up in the throttle body or idle passages


• Faulty PCV valve or PCV hose leaks


• MAL/MAP sensor readings that are out of spec, causing incorrect air-fuel calculations


• Evaporative system issues (such as a loose gas cap or a faulty purge valve)


• EGR valve problems or blocked passages

Diagnosing P0507 typically starts with inspecting the intake and vacuum system, then checking sensors, and finally addressing any build-up or hardware faults that prevent the idle from being properly commanded.

How to diagnose P0507 on a 2015 Accord

To confirm the cause and avoid unnecessary repairs, follow a systematic diagnostic approach. The following steps are commonly used by technicians:

1. Connect an OBD-II scanner and verify the P0507 code along with any related codes.


2. Check live data: idle RPM, commanded idle, MAF and MAP readings, and throttle position sensor data


3. Inspect for vacuum leaks using visual inspection and a spray-test method around hoses, intake gaskets, and the throttle body


4. Inspect and test the PCV valve and PCV hoses for clogs or leaks


5. Clean the throttle body and any idle passages if carbon buildup is present


6. Inspect EVAP system components (gas cap, purge valve, and associated hoses) for leaks or malfunctions


7. Check EGR valve and passages for sticking or clogging


8. Verify there are no pending software updates or service bulletins for the ECU related to idle control


9. After repairs, clear codes and perform a road/idle test to confirm the issue is resolved

If the idle remains high after addressing obvious leaks and carbon buildup, further sensor testing or replacement (MAF/MAP, or throttle-body-related components) may be required.

Repairs and estimated costs for P0507 on a 2015 Accord

Fixes vary widely depending on the root cause. Below are typical options and ballpark costs, noting that labor rates differ by region and shop.

• Vacuum hose and gasket replacement or repair: $20–$120 (parts and labor)


• Throttle body cleaning or service (if carbon buildup is the issue): $80–$180


• PCV valve and hose replacement: $20–$60 (parts) plus labor


• MAF sensor replacement: $150–$350 (parts) plus labor


• MAP sensor replacement: $50–$180 (parts) plus labor


• Gas cap replacement (if a faulty cap is contributing to EVAP issues): $5–$25


• EGR valve cleaning or replacement: $100–$400


• Throttle body replacement (if necessary): $400–$900


• ECU/PCM programming or update: $100–$300 plus potential diagnostic time

Prices assume professional service; DIY cleaning and inspection can reduce costs significantly, but incorrect fixes may result in recurring codes.

Model-specific notes for the 2015 Honda Accord

The 2015 Accord uses electronic throttle control to manage idle speed. Commonly, high idle issues on this model stem from air leaks, throttle body carbon buildup, or sensor readings that cause the ECU to misjudge idle needs. While there are no universal recalls specifically for P0507 on all 2015 Accords, a dealership can check for model-year service notices and confirm correct ECU calibration or updates if applicable. A careful inspection of the throttle body and vacuum system is often the quickest path to a fix.

Summary

In short, P0507 on a 2015 Honda Accord signals that the engine is idling higher than the ECU intends. The most common culprits are vacuum leaks, dirty throttle bodies, PCV issues, and sensor readings that misfire idle control. A structured diagnostic approach—checking for leaks, cleaning the throttle body, validating sensor data, and applying necessary repairs or updates—usually resolves the issue. If you notice a persistently high idle after basic checks, consult a qualified technician to pinpoint the exact cause and prevent future drivability problems.