Code
P24F6
Generic
P — Powertrain
Exhaust Aftertreatment Fuel Air Purge Valve Stuck Open
Views:
UK: 13
EN: 18
RU: 16
AI status
Completed
Completed
100%
Causes
- Stuck or seized purge valve (mechanical obstruction, carbon/soot buildup)
- Defective purge valve solenoid or actuator
- Damaged, disconnected or shorted wiring or connector
- Faulty ECM/PCM driver or internal software fault
- Blocked or damaged vacuum/pressure lines or hoses to the valve
- Contamination from fuel, oil or soot in valve body or passage
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Check-engine light with related aftertreatment/evap or purge warnings
- Poor fuel economy or increased emissions
- Rough idle, stumbling or reduced engine performance
- Uncontrolled or prolonged DPF regeneration cycles or failed regens
- Fuel smell or visible smoke from exhaust in severe cases
What to check
- Read freeze frame and related codes; record live data for valve command and response
- Visual inspection of valve, mounting, vacuum/pressure lines and connectors for damage, contamination or leaks
- Backprobe/inspect wiring harness for chafing, corrosion, open or shorted circuits
- Measure valve coil resistance with multimeter and compare to specification
- Check for proper supply voltage and ground at the connector while commanding the valve
- Apply battery voltage to valve (bench or in‑vehicle) to verify mechanical operation
Signal parameters
- Commanded state: ECM/PCM duty cycle or ON/OFF command (expected closed when not commanded open)
- Actual response: valve position or flow feedback (if available) should match commanded state
- Coil resistance: typical solenoid resistance (ohms) — compare to manufacturer spec
- Voltage supply to valve: battery voltage when commanded (~12 V) and key-on
- Current draw: expected amp draw when solenoid energized
- Vacuum/pressure upstream and downstream: verify expected differential when valve closed vs open
Diagnostic algorithm
- Retrieve stored DTCs and freeze frame data. Note other related codes (evap, EGR, aftertreatment sensors).
- Visually inspect the purge valve, mounting, hoses and electrical connector. Look for contamination, broken clips, or disconnected lines.
- With ignition off, measure valve coil resistance. Compare to spec. Infinite or very high resistance indicates open coil; near zero indicates short.
- Backprobe connector. With ignition on, verify reference voltage and ground. Command valve on/off with scan tool and observe voltage/duty change.
- Command valve closed via scan tool while monitoring flow/pressure or valve feedback. If command indicates closed but flow/pressure shows open, suspect mechanical stick or leak.
- Bench-test valve by removing it and applying proper voltage to verify it physically opens and closes. Clean if sticky and re-test.
- Inspect and pressure- or smoke-test vacuum and purge hoses for leaks, restrictions, or blockages; replace damaged hoses.
- If wiring or connector faults are found, repair harness and re-check. Repair or replace valve if mechanical or electrical failure confirmed.
- If valve and wiring test good but fault returns, check ECM output driver with an appropriate scope or test equipment and consider ECM diagnosis/flash as last resort.
- After repairs, clear codes and perform a drive/regen cycle while monitoring live data to confirm proper valve operation and that code does not return.
Likely causes
- Carbon/soot or contamination causing valve to stick open
- Failed solenoid or coil (electrical failure)
- Damaged wiring, poor connector pin contact or short to ground/power
- Collapsed/blocked vacuum or purge line
- ECM/PCM output driver fault (less common)
Fault status
Status
Stored when the ECM/PCM detects the exhaust aftertreatment fuel-air purge valve remains open when it should be closed (valve stuck open). This condition affects aftertreatment control and emissions; MIL on.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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