P0468 Code - Purge Flow Sensor Circuit High Input

What Does P0468 Mean?

OBD-II Code Powertrain Control Module (PCM) failure is defined as a EVAP Purge Flow Sensor Circuit High

The evaporative control (EVAP) system captures any fuel vapors from the fuel tank and sends them through the vehicle's intake to be burned in the normal combustion process. The EVAP Purge Valve allows the fuel vapors to enter the engine through the intake. When the engine control module (PCM) detects the evap system has flow when it should not, it will set code P0468.

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What are the common causes of P0468 ?

A variety of problems may cause a vehicle to set this code, including:

• A clogged or damaged charcoal canister
• A purge control solenoid fault
• Cracked or broken fuel vapor or vacuum hoses
• A pressure or flow sensor malfunction
• An incorrectly installed gas cap
• PCM (Powertrain Control Module) failure (very rare)

How do you troubleshoot P0468 ?

Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed.

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