P2420 low

EVAP System Switching Valve Control Circuit High

The P2420 code means the vehicle's onboard diagnostic system has detected: EVAP System Switching Valve Control Circuit High. This is a low severity code.

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Keep driving?
Yes, but fix soon
DIY difficulty
moderate
Estimated cost
$75 - $350 (parts and labor)
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Common Symptoms

  • Check Engine Light illuminated
  • Failed emissions inspection
  • No driving performance impact
  • EVAP system monitor not completing
  • Possible fuel odor

Probable Causes (Ranked by Likelihood)

  • Open circuit in EVAP switching valve wiring Very High
  • Disconnected EVAP valve connector High
  • Failed EVAP valve with open coil winding Moderate
  • Broken wire in harness to EVAP valve Moderate

Step-by-Step Diagnostic Procedure

  1. Check if the EVAP switching valve connector is plugged in

  2. Measure solenoid coil resistance (infinite means open)

  3. Inspect wiring from ECM to the valve for breaks

  4. Check for damage from rodent chewing on wires

  5. Verify voltage at the valve connector with key on

Frequently Asked Questions

Can I drive with code P2420?

Yes, completely safe to drive. Only the EVAP system is affected.

What causes P2420?

Usually a disconnected connector or broken wire. Check the connector first for a quick fix. Rodent damage to wiring is also common.

Is P2420 expensive to fix?

Typically $75 to $350. A disconnected connector costs nothing to fix. Solenoid or wiring replacement is moderately priced.

Sources

This page is built from documented references. Verify against your own service info before repair work.

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