P0446 Scion Code - EVAP System Vent Control Circuit
Quick Answer
The Evaporative System (EVAP) canister vent control valve is located on the EVAP canister and is used to seal the canister vent. Common causes include Missing Fuel cap, Incorrect fuel filler cap used, Fuel filler cap remains open or fails to close. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
- What it means
- P0446 Scion indicates EVAP System Vent Control Circuit.
- Common causes
- Common causes include Missing Fuel cap, Incorrect fuel filler cap used, Fuel filler cap remains open or fails to close.
- Severity
- Low - monitor the vehicle and repair when practical.
- Can I drive?
- The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
Code P0446 Scion Description
This solenoid valve responds to signals from the Engine Control Module (ECM). When the ECM sends an ON signal, the coil in the solenoid valve is energized. A plunger will then move to seal the canister vent. The ability to seal the vent is necessary for the on board diagnosis of other evaporative emission control system components. This solenoid valve is used only for diagnosis and usually remains open.
The P0446 code is triggered when an improper voltage signal is sent to Engine Control Module through the EVAP canister vent control valve.
What are the Possible Causes of the DTC P0446 Scion?
- Missing Fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- Vent control valve harness is open or shorted
- Vent control valve circuit poor electrical connection
- Faulty vent control valve
How to Fix the DTC P0446 Scion?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0446 Scion code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0446 Scion Code
1. What does the OBDII code P0446 mean on a Scion?
P0446 indicates a malfunction in the EVAP (Evaporative Emission Control) system's vent control circuit, which helps prevent fuel vapor from escaping into the atmosphere.
2. What are the common symptoms of P0446 on a Scion?
Symptoms may include an illuminated check engine light, a slight fuel odor, or difficulty refueling, but the vehicle may otherwise run normally.
3. What causes the P0446 code to appear on a Scion?
Common causes include a faulty vent control valve, clogged or damaged EVAP hoses, a malfunctioning charcoal canister, or electrical issues such as damaged wiring or a blown fuse.
4. Can a loose gas cap cause the P0446 code on a Scion?
While a loose gas cap is often linked to other EVAP codes, it’s less likely to cause P0446, which is specific to the vent control circuit.
5. How do you diagnose the P0446 code on a Scion?
Diagnosis involves checking the vent control valve for proper operation, inspecting EVAP hoses for blockages or damage, and testing the wiring and connectors for continuity or corrosion.
6. Is it safe to drive a Scion with the P0446 code?
Yes, it’s generally safe to drive, but the issue should be addressed promptly to avoid potential emissions problems or difficulty passing an emissions test.
7. How do you fix the P0446 code on a Scion?
Repairs may include replacing the vent control valve, cleaning or replacing clogged EVAP hoses, repairing damaged wiring, or replacing the charcoal canister.
8. How much does it cost to fix the P0446 code on a Scion?
The cost varies depending on the exact issue, but replacing the vent control valve typically ranges from $150 to $300, including parts and labor.
9. Can the P0446 code clear itself on a Scion?
The code may clear temporarily if the issue is intermittent, but it will likely return until the root cause is repaired.
10. Do I need special tools to fix the P0446 code on a Scion?
Basic tools may suffice for some repairs, but diagnosing the issue accurately may require an OBDII scanner and a multimeter to test components.
Discuss the causes and fixes for P0446 Scion OBDII Code
-
The fuel cap has come off of the connecting piece so when you get gas you have to hold the cap in your hand. Would that trigger this code?
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No, but if you din't fully tight the fuel cap, it could trigger the code.
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