P2420

EVAP System Switching Valve Control Circuit High

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–56 (est.)

Symptoms

Check Engine Light Is On
Increased fuel consumption
Difficulty starting the engine
Unstable engine idling
Dips during acceleration

Causes

Short circuit in EVAP valve control circuit
EVAP switch valve malfunction
Broken or damaged wiring
Relay or fuse problems
Engine control unit (ECU) malfunction

How to Fix

Check EVAP system fuses and relays
Inspect the wiring harness for damage
Check EVAP valve resistance
Check control circuit voltage
Replace EVAP switch valve if necessary

Related codes

P2419 P2421 P0440