P2418

EVAP System Switching Valve Control Circuit/Open

Q: Is it safe to drive with P2418?

Yes. It is an emissions fault and does not affect drivability or safety. Repair it to clear the light and pass an emissions test.

Q: Can I just clear P2418?

It returns unless the valve or its wiring is repaired, since the computer keeps testing the circuit.

Evaporative emissions (EVAP) Generic OBD-II Low

What it means

P2418 means the engine computer detected an open or control-circuit fault in the evaporative emissions (EVAP) switching valve. This valve routes fuel vapors within the EVAP system, so the fault is emissions-related and does not affect how the vehicle runs. The usual causes are wiring, the connector, or the valve solenoid.

Low

Can I keep driving? Safe to drive. This is an emissions fault with no effect on how the vehicle runs, though it may fail an emissions test.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
No noticeable change in how the vehicle drives
Possible faint fuel odor if vapors are not managed
May fail an emissions/readiness test

Common causes

Most likely first

Corroded or loose connector at the EVAP switching valveLikely
Open or shorted control wire to the valveCommon
Failed EVAP switching valve solenoidCommon
Poor ground or supply to the valve circuitLess often
Failed PCM/ECM driver (less common)Less often

How to diagnose & fix

Work through it in order

Read freeze-frame data and inspect the switching valve connector and wiring for corrosion or an open.
Command the valve with a scan tool and confirm it responds.
Measure the valve solenoid's resistance and check its power and ground.
Replace the switching valve if the solenoid or circuit is open.
Clear the code and complete a drive cycle to confirm the repair.

FAQ

Quick answers

Is it safe to drive with P2418?+

Yes. It is an emissions fault and does not affect drivability or safety. Repair it to clear the light and pass an emissions test.

Can I just clear P2418?+

It returns unless the valve or its wiring is repaired, since the computer keeps testing the circuit.

Read & clear P2418 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX