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P2418 is a diagnostic trouble code (DTC) for "EVAP Switching Valve Control Circuit/Open". 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 for $114.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.0 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
A P2418 trouble code is related to a vehicle’s evaporative emissions control system, or EVAP. These are fitted to most modern vehicles to help trap gasoline vapors before they escape into the atmosphere, either from the fuel tank or the fuel system. The system is often controlled by a switching valve or purge control solenoid.
P2418 is an OBD-II generic powertrain code for a voltage problem with the EVAP system and its switching control mechanism. The EVAP sends variations of pressure and flow as degrees of voltage to the engine computer. If any of those are off the manufacturer’s parameters, a Check Engine Light will be triggered.
While the main cause for a P2418 will typically be the EVAP switching valve or solenoid, EVAP systems are made up of numerous little components. Likely causes include:
It’s rare for an EVAP code to cause any noticeable symptoms. However, it isn’t uncommon for a P2418 to be accompanied by other EVAP codes.
First, a mechanic will usually clear the code and test drive the vehicle to see if the P2418 immediately returns. If it doesn’t, the problem is intermittent and may require longer periods of driving for the cause to become more apparent. Other simple fixes may be tightening the gas cap.
However, if the code persists, a serious of tests will help reveal if the switching valve or control solenoid are to blame. A professional OBD-II scanner may be able to activate a part of the EVAP system called the leak detection pump. If this isn’t working in first place, you could spend hours chasing a problem that doesn’t exist. After confirming that this pump works, the mechanic can move on to testing the switching valve by applying voltage to the solenoid. This should trigger it off and on – if not then the valve will need to be replaced. If it is in working order however, chances are there will be other EVAP codes that will help your mechanic determine what the route of the cause is.
Forgetting to check the leak detection pump can cause a lot of lost time and wasted repairs to get rid of a P2418. This should be checked to ensure it is working properly. A lot of EVAP codes are also triggered due to loose gas caps and vacuum leaks.
A P2418 will not cause any damage to your vehicle nor will it affect its performance in any way. It will however cause your EVAP system to not work according to the manufacturer’s specifications and as a result, your vehicle will emit more emissions that normal.
The most common repairs for a P2418 are as follows:
EVAP codes can be some of the most frustrating trouble codes to fix and troubleshoot. They can also be some of the easiest due to the high probability of a loose gas cap being the cause. It’s important to try the easiest repair route first before diving in to buying replacement parts.
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