P0468 low

EVAP Purge Flow Sensor Circuit High

The P0468 code means the vehicle's onboard diagnostic system has detected: EVAP Purge Flow Sensor Circuit High. This is a low severity code.

My Garage →
Keep driving?
Yes, but fix soon
DIY difficulty
moderate
Estimated cost
$80 - $300 (parts and labor)
Try This First ($8 Fix)
Stant 10838 OE Fuel Cap

A cracked or loose gas cap causes 60%+ of EVAP codes. This $8 replacement clears P0442, P0455, and P0457 more often than any other repair.

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Find the Leak
THIKPO Automotive Smoke Machine

If a new gas cap does not clear it, the leak is somewhere in the EVAP plumbing. A smoke machine finds the exact leak -- a cracked hose, bad seal, or stuck vent valve -- in minutes instead of guessing at parts.

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Clear the Code
ANCEL AD310 OBD-II Scanner

Clear the code after the repair. If the light stays off after 50 miles, you just saved $200+ in shop fees.

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Common Symptoms

  • Check Engine Light on
  • No driveability issues
  • EVAP monitor does not complete
  • Possible minor fuel odor

Probable Causes (Ranked by Likelihood)

  • Open circuit in purge flow sensor wiring Very High
  • Failed sensor (open) High
  • Disconnected connector Moderate
  • Short to reference voltage Low

Step-by-Step Diagnostic Procedure

  1. Read sensor voltage. Above maximum confirms high/open circuit.

  2. Check connector is seated.

  3. Test wiring continuity.

  4. Replace sensor if open.

Frequently Asked Questions

What causes circuit high on the purge flow sensor?

An open wire or disconnected sensor causes the signal to float to the reference voltage, indicating no valid reading.

Can a disconnected line cause P0468?

A disconnected EVAP line would not directly cause a circuit high code, but a disconnected electrical connector would.

Is the sensor replaceable?

Yes, the purge flow sensor is a separate component in the EVAP purge line and can be replaced individually.

Sources

This page is built from documented references. Verify against your own service info before repair work.

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