P0468 Fault Code

Purge Flow Sensor Circuit High Input

• What does that mean?
• Symptoms
• Causes
• Solutions

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.

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.

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.

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.