P2419: EVAP switching valve circuit reading low
Evaporative emission system switching valve control circuit low
Severity: Monitor
P2419 is an EVAP-monitor fault; it blocks the leak test and may bring a fuel smell, but it does not change how the car drives.
It gets more serious if:
- Inspect soon: Have it checked soon if you smell fuel, which PartsAvatar lists as a sign with this code.
P2419 in short
P2419 means the computer saw low voltage in the EVAP switching valve circuit, a valve that is part of the leak detection pump or canister assembly. On Toyotas the canister assembly is often the fix when P2401 and P043E also appear. The car drives normally but will not pass emissions.
The switching valve helps the computer seal and test the EVAP system. P2419 sets when its control circuit reads low, from a short to ground, a broken wire or a failed valve.
PartsAvatar lists the leak detection pump, wiring, purge valve, canister, hoses and the pressure sensor as possible causes.
An IATN thread reports that, on a 2006 Scion xB and Corolla with related EVAP codes, replacing the charcoal canister and its parts fixed it; Toyota TSB-0046-10 ties the code group to fuel in the EVAP system.
Most likely causes
Cause 1: Valve or wiring fault in the switching valve circuit
Common general cause- Why it ranks here
- PartsAvatar says to test the pump solenoid and wiring first.
- What would change this
- Rises if the circuit measures low or open. Falls if it tests normal.
Cause 2: EVAP canister assembly contaminated or failed (Toyota)
Supported by vehicle data- Why it ranks here
- Toyota TSB-0046-10 lists this group of codes with fuel in the EVAP system; IATN reports canister replacement on 2006 xB and Corolla.
- What would change this
- Rises if P2401 and P043E also appear on a Toyota. Falls if a circuit fault is found.
Cause 3: Blocked atmospheric line or hoses
Possible — needs testing- Why it ranks here
- PartsAvatar says to check for obstruction in atmospheric lines.
- What would change this
- Rises if a line is blocked. Falls if flow is free.
What to test first
Start at step 1. Each result tells you what it means and where to go next.
Step 1: Read all codes and look for P2401 and P043E on a Toyota or Scion.
IfP2401 and P043E are also stored
It meansSuspect the canister assembly.
IfP2419 alone
It meansTest the circuit.
Step 2: Have a shop test the switching valve circuit and inspect the canister for fuel or debris.
Warning:EVAP lines hold fuel vapor; keep ignition sources away.
IfThe circuit tests bad
It meansRepair it.
Points to: Valve or wiring fault in the switching valve circuit
IfThe canister is contaminated
It meansReplace the canister assembly.
Points to: EVAP canister assembly contaminated or failed (Toyota)
IfA line is blocked
It meansClear or replace it.
Symptoms
- Check engine light
- Fuel odor Gets more serious: stop and have it checked.
- Failed emissions test
Compare with: Check engine light came on after getting gas
How to fix
Step 1: Check the fuel cap clicks tight and look for cracked EVAP hoses with the engine off.
Parts and cost context
- EVAP charcoal canister:Confirm the cause before replacing the canister. Labour varies; get a quote.
Labor varies by vehicle and shop; get a quote before you approve a repair.
Compare used part prices on PartPriceGuideOn your vehicle
ToyotaYour car
2006–2010 · RAV4
Supported by vehicle dataToyota TSB-0046-10 lists P043E, P043F, P2401, P2402 and P2419 together with fuel in the EVAP system. Only the cached summary was read.
TSB-0046-10Status unverified
MIL on, fuel in EVAP system
2006–2010rav4 · NHTSA 10033407
Some vehicles show P043E, P043F, P2401, P2402 and P2419 with intermittent rough idle because of fuel in the EVAP system.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.
01505Status unverified
MIL on, DTC P043E, P043F, P2401, P2402 and P2419
2005sequoia · NHTSA 10015869
Lists the same group of EVAP codes; summary does not state the repair.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.
Related codes
P2419 questions
Why do P2419, P2401 and P043E show together?
On some Toyotas they share one cause, fuel or contamination in the EVAP canister assembly, per Toyota bulletins.
Sources and review
- P2419 OBD code overview
- Toyota TSB-0046-10: MIL on, fuel in EVAP system (P043E, P043F, P2401, P2402, P2419)
- P2419 DTC (IATN tech mail summary, April 2011)
- Last reviewed
- Written by
- Saurabh K.
- Editorial review
- Pending
- Technician review
- Technician review pending
This page explains what a code usually means; it is not a substitute for a professional inspection. How we source and review · Report an error