OBD-II Code
P0468
Severity
Not yet reviewed
Nobody on our side has assessed this code yet, so we are not going to guess at how serious it is.
Can you drive it
We cannot say
Treat it as unknown until a shop reads it with live data. If the check-engine light is FLASHING, stop driving as soon as it is safe to — that means an active misfire, whatever the code.
Indicative cost (USD)
$130–$470
From this code's diagnostic notes. Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
P0468 is the inverse of P0467 — the ECM sees the purge flow sensor signal pinned HIGH (typically above 4.7V) when commanded duty cycle doesn't justify it, OR even with purge solenoid commanded fully closed.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then follow the diagnostic notes further down this page, in the order they are written.
They are written in the order a shop works this code, cheapest checks first. Where they name a component, inspect its wiring and connector before replacing it.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Check engine light
Read the full diagnostic procedureP0468 is the inverse of P0467 — the ECM sees the purge flow sensor signal pinned HIGH (typically above 4.7V) when commanded duty cycle doesn't justif…
P0468 is the inverse of P0467 — the ECM sees the purge flow sensor signal pinned HIGH (typically above 4.7V) when commanded duty cycle doesn't justify it, OR even with purge solenoid commanded fully closed. Either the sensor element is biased high from contamination, the signal wire is shorted to 5V reference or battery voltage, or the sensor is correctly reporting genuine high flow because the purge solenoid is stuck open and dumping unmetered vapor into the intake.
Cheapest-first ladder
- Backprobe the purge flow sensor signal pin KOEO — if it reads 4.8-5.0V with no engine running, the signal wire is shorted high (chafe against a hot lead) or the sensor's internal pull-up has failed.
- Disconnect the sensor; if signal voltage at the ECM pin drops to 0V with the connector unplugged, the sensor is biased internally — replace it. If voltage stays at 4.8V+ with the sensor unplugged, the wire is shorted to a power source — trace the harness.
- Verify the purge solenoid isn't mechanically stuck open by removing the vacuum line and watching for vapor flow with key-off; a stuck-open solenoid lets the sensor see real high flow with zero command, which sets P0468 from a sensor-perspective even though the sensor is innocent.
- Inspect the sensor element for oil/carbon contamination biasing the hot-wire reading. Before condemning the purge flow sensor, check whether the carbon canister is recently saturated — liquid fuel coating the sensor element biases it artificially high and clears after a few days of vapor-only purge cycles ($0 fix vs. $400 part).
Vehicle-specific patterns2009-2014 Volvo S60/XC60 throws P0468 from purge solenoid diaphragm failure letting unmetered vapor through with zero command — sensor reading is acc…
- 2009-2014Volvo S60/XC60 throws P0468 from purge solenoid diaphragm failure letting unmetered vapor through with zero command — sensor reading is accurate, solenoid is the actual fault.
- 2011-2017Hyundai Sonata/Tucson/Santa Fe GDI throws P0468 from oil-saturated sensor elements after extended idling cycles overload the carbon canister.
- 2010-2015Kia Sorento/Optima GDI shares the pattern.
- 2008-2014Ford F-150 EcoBoost 3.5L throws P0468 from harness chafe near the intake manifold where the signal wire rubs against a hot exhaust shield and shorts to 12V intermittently.
- 2007-2012Volvo S40/V50/C30 throws P0468 from a sensor internally biased high after coolant intrusion via a leaking thermostat housing nearby.
Estimated repair$130 to $470.
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