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P0468 is a diagnostic trouble code (DTC) for "EVAP Control System Malfunction". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
The P0468 code is defined as Purge Flow Sensor Circuit High Input. Co-existing OBD-II codes may include P0440 or P0442, often indicating a loose gas cap, or P0443 through P0449, which can indicate an EVAP Purge Valve problem.
P0468 is the OBD-II code telling you that the EVAP control system is malfunctioning, often due to an open circuit between the purge flow sensor and the PCM. Other affected components may include the gas cap, purge valve, fuel lines, pressure and flow sensors, wiring, hoses, connectors, vacuum lines, or the fuel tank.
A variety of problems may cause a vehicle to set this code, including:
A Purge Flow Sensor Circuit High Input code typically causes the Check Engine light to illuminate, although no major symptoms are likely to be present. There are often other stored codes related to the evaporative emission control system.
In order to pinpoint the cause of this code, a combination of methods is typically used. The technician will likely use a scanner, a voltmeter, and a smoke machine (used for detecting leaks). The inspection usually begins with a visual assessment of the EVAP Emission Control System wiring and connectors to check for corroded, damaged, or disconnected parts. Once any damaged parts are replaced, the technician will retest the system and connect the scanner in order to record freeze frame data and stored codes.
The next step is to clear all codes and test drive the vehicle to see if the code returns. If a leak is present and the gas cap is securely installed, the vacuum and fuel vapor hoses should then be inspected for damage, kinks, or breaks, and repaired as necessary. If the hoses are in good condition, the mechanic will check for corrosion or damage to the purge valve and charcoal canister.
If none of these actions yields a solution, a technician may use a smoke machine to give visual indication of the leak’s location.
Because there is an extensive network of hoses and connectors involved in the Evaporative Emissions Control Circuit it can be easy to miss a tiny leak. Components are sometimes replaced within the system when the problem actually resides around the gas cap or because of hose damage. All steps should be properly executed in order to rule out each potential problem.
While the vehicle will still run while setting this code, it’s important to get the problem repaired as soon as possible to avoid affecting other components of the EVAP Emissions Control System.
The most common repair for this code is to replace the Purge Flow Sensor. If the sensor is not the problem, repairs may be made the connectors, wiring, hoses, charcoal canister, or Purge Control Solenoid. The fuel cap and the surrounding area are also common culprits in an EVAP Emissions Control System fault.
It’s common for sensors to cause an intermittent condition, where the code will set sometimes, but not others. Finding the source of the problem may involve waiting until the issue becomes consistent, with the code returning every time the scanner is cleared and the vehicle driven again. On older models, the Purge Control Solenoid and Purge Flow Sensor typically have to be replaced together. Due to the complex network of components involved in the EVAP system, it’s best to have this code assessed by a professional.
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