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Severity: Low Code type: Generic (all makes)

P2419 Code: EVAP Switching Valve Control Circuit Low

Too little voltage on the EVAP switching (vent) valve control wire – wiring or canister pump module.

At a glance

Severity: 2/5 – Low2/5

Severity: Low

Meaning
EVAP Switching Valve Control Circuit Low
System
Emission Controls · Powertrain
Safe to drive?
Yes, short term
Typical repair cost
$20–$1,100
DIY difficulty
Moderate

Many Toyota and Lexus models, and vehicles using a Bosch-style tank leak module, carry a canister pump module that combines a small vacuum pump, a pressure sensor, a reference orifice and a solenoid-operated switching valve. During the leak test the ECM flips that switching valve so the pump pulls on the fuel tank side instead of through the reference orifice, and compares the two pressure readings. P2419 means the voltage on the valve's control wire is lower than the ECM expects, usually from an open circuit, a short to ground or a failed valve coil inside the module. Depending on how the circuit fails, the valve can stay parked in either position, so the leak test is aborted and, on some vehicles, refueling can become slow.

Can I keep driving? Driving is fine. If the pump nozzle keeps clicking off while you fill up, don't force extra fuel in – that can soak the charcoal canister and turn a wiring fault into a much bigger repair.

How to read P2419

How to read P2419P12243194
  1. P Powertrain
  2. 2 Generic (SAE)
  3. 4 Auxiliary emission controls
  4. 19 Specific fault

Symptoms

  • Check engine light, engine runs normally
  • EVAP monitor stays incomplete
  • Occasionally slow refueling or the nozzle shutting off early
  • No click from the canister area when the switching valve is commanded with a scan tool
  • P2401 or P2402 stored alongside when the whole module or its plug is affected

Possible causes

Ranked by how often each cause is behind this code (editorial estimate).

  1. Water, mud or corrosion in the canister pump module connector 30%
  2. Switching valve coil failed inside the canister pump module 26%
  3. Control wire open or grounded where the harness runs along the frame near the tank 20%
  4. Rodent damage to the rear harness 10%
  5. Module connector left loose after fuel tank or canister work 8%
  6. ECM output driver fault 6%

Diagnosis step by step

Diagnostic flow: P24191Record all EVAP codes and data2Run the vent/switching valve activetest3Inspect the module and connector4Measure the valve coil5Check the harness to the ECM6Clear and confirm

  1. Record all EVAP codes and data

    Save the freeze frame and note any P2401, P2402 or P2420 as well. Several module codes at once point to the module connector or its power supply; P2419 on its own points to the switching valve circuit.

    Tools: OBD-II scanner

  2. Run the vent/switching valve active test

    With a scan tool that supports it, command the switching valve (often labelled vent valve) on and off with the engine off. You should hear a distinct click at the canister and see the EVAP pressure reading react when the pump is also running.

    Tools: OBD-II scanner

  3. Inspect the module and connector

    The canister pump module is mounted on or next to the charcoal canister, typically near the fuel tank or rear frame rail. Unplug it and look for water, green corrosion or bent pins; also check that the connector lock is fully seated.

    Tools: Flashlight, Screwdriver

  4. Measure the valve coil

    Measure resistance across the switching valve pins on the module side. Coil values vary by design, but many read somewhere in the tens of ohms at about 68 °F; an open circuit or a reading near zero means the module needs replacing.

    Tools: Multimeter

  5. Check the harness to the ECM

    Disconnect the battery, module and ECM. The control wire should show under about 1 ohm end to end and no continuity to chassis ground. Pay special attention to spots where the harness is clipped to the frame or passes over the tank.

    Tools: Multimeter

  6. Clear and confirm

    After the repair, clear codes and repeat the active test. The EVAP monitor needs a cold soak, typically with the engine off for several hours, before it runs again.

    Tools: OBD-II scanner

Where the parts are

EVAP system: gas cap, canister, purge and vent valves – P2419123456
EVAP system: gas cap, canister, purge and vent valves
  1. 1Gas cap
  2. 2Charcoal canister
  3. 3Purge valve
  4. 4Vent valve
  5. 5Fuel pump
  6. 6Intake manifold

Repair options & costs

RepairDIY?Estimated cost
Clean, dry and reseal module connector Yes $20–$120
Repair open or grounded control wire No $120–$350
Replace canister pump module No $250–$650
Replace charcoal canister with integrated pump module No $450–$1,100

Rough US estimates for parts and labor; shop rates vary by region. Not a quote.

Notes by brand

Toyota

Toyota's canister pump module is used across many models such as Camry, Corolla, RAV4, Highlander, Sienna, Tacoma and Tundra. On several of them the module is serviced only as a complete assembly or together with the canister, so confirm the wiring is good before ordering it.

Field data

Toyota 11 Scion Xa, Corolla, Yaris Liftback

Source: NHTSA Complaints API (US government open data), analyzed by DTC mention.

Emissions / smog test impact

Will fail

An OBD smog check fails while the check engine light is on, and P2419 also leaves the EVAP monitor incomplete. After the fix, allow a few overnight cold soaks and normal drives before the retest.

Frequently asked questions

What is the EVAP switching valve?

It's a small solenoid valve inside the canister pump module that changes which path the leak test pump is pulling on – first a tiny reference orifice, then the fuel tank system. Comparing the two readings tells the ECM whether there's a leak.

Is the switching valve the same as the vent valve?

On many Toyota and Lexus models, yes – the service information calls the same part the vent valve. It also opens the canister to fresh air during normal driving and refueling.

Can I replace just the valve?

Usually not. The valve is built into the canister pump module, which is sold as one unit and on some models only together with the canister.

Why does P2419 affect refueling on some cars?

If the valve is stuck in its closed position, air displaced by incoming fuel can't escape through the canister freely, so the pump nozzle senses back-pressure and clicks off early.

Sources