enbgde
P2418 Generic (SAE) Basic entry

Evaporative Emission System Switching Valve Control Circuit / Open

Updated 2026-10-02 · Fuel, air & emissions (P2)

Severity
Low
Typical repair cost
40 – 350 EUR
System
Powertrain

What it means

P2418 means the engine control module cannot detect current flow in the Evaporative Emission System Switching Valve Control Circuit circuit: the circuit is electrically open somewhere between the module, the connector and the component.

This entry is compiled automatically from the standard definition and typical diagnostic practice for this type of fault. A detailed, reviewed article is in preparation.

Advertisement728 × 90

Symptoms

  • Check engine light on
  • Rough or unstable idle
  • Hesitation or poor acceleration
  • Increased fuel consumption
  • Possible limp mode with reduced power

Common causes

  1. Damaged, chafed or corroded wiring in the Evaporative Emission System Switching Valve Control Circuit circuit
  2. Corroded, loose or water-damaged connector terminals
  3. Failed Evaporative Emission System Switching Valve Control Circuit component (sensor, solenoid or actuator)
  4. Poor ground connection for the module or component
  5. Faulty control module driver (rare, confirm all else first)

How to diagnose

  1. Read freeze frame data and note when the code set (cold start, under load, after rain)
  2. Inspect the Evaporative Emission System Switching Valve Control Circuit connector for bent pins, corrosion and water; wiggle the harness with the engine running and watch live data
  3. Measure supply voltage and ground at the connector with the key on
  4. Check the signal wire for shorts to ground or battery and for continuity to the control module
  5. Test or substitute the Evaporative Emission System Switching Valve Control Circuit only after wiring and connectors are confirmed good
  6. Clear the code and complete a drive cycle to confirm the repair

Frequently asked questions

Can I keep driving with P2418?

Yes. The fault does not affect safety or driveability, but it will keep the warning light on and may fail an inspection.

Will clearing P2418 fix it?

No. Clearing only erases the stored code; it returns as soon as the monitor runs again unless the cause is repaired.

Related codes

P2416P2417P2419P2420

Nearby codes in this group