P0468 Purge Flow Sensor Circuit High Input

Definition: The OBD-II code P0468 indicates that the vehicle’s powertrain control module (PCM) has detected a high input signal from the purge flow sensor circuit. This typically means there is an issue with the electrical circuit or components related to the evaporative emission control system.

p0468 – Purge Flow Sensor Circuit High Input

Typical Severity: Moderate

Common Causes

p0468 – Purge Flow Sensor Circuit High Input

Common causes:

• Faulty purge flow sensor
• Short circuit in the wiring of the purge flow sensor
• Open circuit in the wiring of the purge flow sensor
• Corrosion or poor connections in the purge flow sensor circuit
• Faulty Engine Control Module (ECM)

 

Common Misdiagnosis

OBD2 Code: P0468

Description: Purge Flow Sensor Circuit High Input

Common Misdiagnosis: Replacing the purge flow sensor without checking for wiring issues or a faulty PCM (Powertrain Control Module).

 

Common Diagnostic Steps

OBD2 Code: P0468

Description: Purge Flow Sensor Circuit High Input

• Verify the code with an OBD-II scanner and clear it to see if it returns.
• Inspect the purge flow sensor wiring and connectors for damage or corrosion.
• Check the voltage at the purge flow sensor using a multimeter to ensure it is within specifications.
• Test the purge valve operation to ensure it is functioning correctly.
• Inspect vacuum lines connected to the purge system for leaks or blockages.
• If equipped, check for any related Technical Service Bulletins (TSBs) from the manufacturer that may address this issue.
• If all else fails, consider replacing the purge flow sensor after verifying its failure through testing.