P0468 Fault Code

P0468 OBD-II Trouble Code Short Description

Purge Flow Sensor Circuit High Input

What does trouble code P0468 mean?

The P0468 fault code indicates a high input signal detected from the purge flow sensor circuit. This sensor plays a crucial role in monitoring the vapor flow in the evaporative emissions system. When the signal is higher than expected, it suggests a potential issue within the circuit or with the sensor itself.

Symptoms

What are the symptoms of the P0468 code?

Drivers may notice various symptoms associated with this fault code, such as:

  • Check Engine Light illuminated on the dashboard.
  • Difficulty in starting the engine.
  • Increased emissions during vehicle operation.
  • Possible rough idling or stalling in some scenarios.

Causes

What causes the P0468 code?

Several factors can lead to a P0468 code, including:

  • A defective purge flow sensor.
  • Electrical issues such as frayed wires or loose connections in the sensor circuit.
  • High internal resistance within the sensor.
  • Issues with the Engine Control Module (ECM) reading the input signal incorrectly.

Possible Solutions

How to fix P0468?

To address a P0468 code, the following steps are recommended:

  • Inspect the purge flow sensor for physical damage or wear.
  • Check all related wiring and connectors for signs of corrosion, loose connections, or fraying.
  • Test the sensor's output with a multimeter to verify its functionality.
  • Replace the purge flow sensor if it's found to be faulty.
  • Clear the fault codes and monitor for reoccurrence.