What it means
The exhaust aftertreatment fuel-air purge valve is detected as stuck open. The code does not establish which dosing system uses the valve.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
The exhaust aftertreatment fuel-air purge valve controls a purge path in an aftertreatment fuel-air system. The control module monitors whether that valve closes as commanded. P24F6 sets when the valve is detected as stuck open, which can result from coking, debris, or a failed return spring.
Common causes
Most likely first.
- Mechanically stuck open valve from soot or coking
- Broken return spring
- Carbon or debris buildup preventing free movement
Symptoms
- Check-engine light
- Aftertreatment warning light
- Reduced engine power or performance
- Increased exhaust emissions
How to diagnose it
- Read freeze-frame and related aftertreatment codes to establish when the purge valve fault occurred and whether other dosing or regeneration problems are present.
- Inspect the purge valve connector and nearby wiring for damage, corrosion, loose connections, or heat exposure.
- Check the valve command and reported status with a scan tool, if available, to see whether it remains open when commanded closed.
- Inspect the valve and its passages for carbon, soot, or debris that could prevent the valve from seating, following the manufacturer's procedure.
- Test valve movement and electrical control against the manufacturer's specification, including whether the return mechanism closes it.
- If the valve and circuit pass inspection, check the controlling module and system conditions using the manufacturer's diagnostic steps.
Common fixes
- Repair a loose or damaged purge valve connector or wiring.
- Remove permitted carbon or debris buildup that prevents the valve from closing.
- Replace the purge valve if it sticks open or its return spring no longer closes it.
- Repair the control circuit or module only if testing identifies that as the cause.
Can I keep driving?
Avoid heavy loads and extended driving if the engine has reduced power or an aftertreatment warning, since an open purge valve can disrupt emissions-system operation. Arrange prompt repair to limit emissions and prevent related aftertreatment problems.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.