Fault code P1446 – a step-by-step guide to diagnosing and fixing it

The meaning of error code P1446 – Evaporative Vac Solenoid Circuit Malfunction

P1446: Causes, signs and repairs

Error code P1446 is displayed and the check engine light is on - what does this mean?

The DTC P1446 is a manufacturer-specific trouble code that is recognized by the OBD system and indicates a problem with the fuel tank venting system. This trouble code mainly occurs in Honda and Acura vehicles and signals a fault in the EVAP system (Evaporative Emission Control System). The EOBD system registers this fault code if the tank ventilation is not working properly.

What can cause this fault code?

Defective tank ventilation valve
Blocked fuel tank vent line
Damaged or blocked activated charcoal filter
Loose or damaged vacuum hoses
Defective tank pressure sensor
Clogged or defective separator
Electrical problems at the plug connections
Defective fuel pump with integrated ventilation module

What symptoms occur in parallel with fault code P1446?

Starting problems: The vehicle may be difficult to start or take longer to start
Fuel tank problems: Difficulty refueling or premature shutdown of the fuel nozzle
Fuel smell: Smell of gasoline in or around the vehicle
Loss of power: Reduced engine power when the tank level is low
Idling problems: Unsteady idling or engine stuttering
Increased fuel consumption: Measurably higher fuel consumption

How to fix the problem of error code P1446?

Repairing the P1446 code requires a systematic diagnosis of the EVAP system.
Replace the fuel tank vent valve: Locate the defective valve on the fuel tank and replace it with a new original or equivalent replacement part
Clean or replace vent lines: Blow through clogged hoses with compressed air or replace completely if damaged
Replace the activated charcoal filter: Replace the saturated or clogged carbon filter in the EVAP system with a new one
Check and replace vacuum hoses: Check all vacuum lines for cracks and loose connections and replace defective parts
Replace tank pressure sensor: Remove the faulty sensor on the fuel tank and replace with a functional component
Repair electrical connections: Clean, tighten or completely replace corroded or loose plug connections

FAQ - Frequently asked questions about DTC P1446

Can I continue driving with error code P1446?

Yes, the vehicle can still be driven, but you should have the P1446 code rectified as soon as possible. Prolonged driving can lead to increased emissions and fuel consumption.

How much does it cost to repair error code P1446?

The repair costs for DTC P1446 are between 150-600 euros, depending on the defective component. A tank vent valve costs around 80-200 euros, while more extensive EVAP repairs can be more expensive.

How long does it take to diagnose trouble code P1446?

Professional diagnosis of fault code P1446 takes around 1-2 hours in the workshop. The actual repair time varies between 30 minutes and 3 hours, depending on the defective component.

Can fault code P1446 be caused by incorrect refueling?

Yes, overfilled fuel tanks or refueling after the nozzle has been switched off for the first time can damage the EVAP system and trigger code P1446.

Is DTC P1446 a safety-critical fault?

No, error code P1446 does not represent an immediate safety hazard. However, it does affect the environmental compatibility of the vehicle and can lead to problems during the main inspection.

How can I delete fault code P1446 myself?

The trouble code P1446 can be deleted with an OBD scanner, but will return if the cause has not been rectified. Professional diagnosis is therefore recommended.

Vehicles in which fault code P1446 occurs most frequently

Error code P1446 is a manufacturer-specific DTC and can mainly occur in Honda and Acura vehicles, but is most common in the following vehicles:

Honda: Civic, Accord, CR-V, Pilot, Odyssey, Fit, HR-V (1998-2020)
Acura: TL, TSX, MDX, RDX, ILX, TLX (2000-2019)
Honda: Ridgeline, Passport, Element, S2000 (2003-2015)
Acura: RL, ZDX, RLX, NSX (2005-2018)

If the code P1446 occurs in your vehicle, you should first check whether it is a Honda or Acura model, as this EOBD code is manufacturer-specific. A professional diagnosis at a specialist workshop is recommended, as the EVAP system is complex and requires precise fault analysis. Do not ignore the fault code, as it can lead to higher emission values and problems with the emissions test in the long term.

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