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DTC codes / Mazda codes / P1446

P1446 · MazdaEvaporative Vacuum Solenoid Circuit

P1446 on Mazda vehicles indicates that the powertrain control module (PCM) has detected an electrical fault in the evaporative vacuum solenoid circuit, which controls purge flow from the charcoal canister. The PCM monitors the solenoid's command wire for expected voltage changes and sets this code when the circuit is open, shorted to ground, or shorted to power.

SystemPowertrain
Code typeMazda specific
SeverityLow
Fix difficultyIntermediate
AreaAuxiliary emission controls

Symptoms you may notice

  • Illumination of the check engine light, often with no other noticeable symptoms.
  • A faint fuel odor may be present around the engine bay or near the charcoal canister.
  • Rough idle or slight hesitation when the PCM attempts to command purge flow.
  • In some cases, a slight decrease in fuel economy due to improper vapor management.
  • Intermittent purge operation that may cause a stumble at idle when the solenoid sticks open.
  • No drivability complaints at all, as the fault is often purely electrical.

Common causes, most likely first

  1. Failed evaporative vacuum solenoid (purge solenoid) with an open or shorted internal coil.
  2. Damaged or corroded wiring harness between the PCM and the solenoid, including chafed wires or broken connectors.
  3. Loose, corroded, or disconnected electrical connector at the solenoid.
  4. Faulty PCM driver circuit, although this is rare and should be confirmed last.
  5. Blown fuse or poor ground connection shared with the solenoid circuit.
  6. Aftermarket alarm or remote start installation that tapped into the solenoid wiring.

How to diagnose and fix it

  1. Verify the code with a scan tool and check for any related evaporative emission (EVAP) codes before proceeding.
  2. Visually inspect the solenoid connector and wiring for corrosion, damage, or loose pins, and repair as needed.
  3. Measure the resistance of the solenoid coil with a multimeter and compare to the manufacturer's specification; replace the solenoid if out of range.
  4. Check for battery voltage at the solenoid connector with the key on, and verify the ground circuit integrity.
  5. Test the control wire from the PCM to the solenoid for continuity and shorts to ground or power; repair the harness if faulty.
  6. Command the solenoid on and off with a scan tool to confirm it clicks and that the PCM driver is functioning.
  7. Clear the code and perform a drive cycle to verify the repair; if the code returns, recheck the PCM driver circuit.

What P1446 really tells you about the purge solenoid

  • A P1446 is almost always an electrical circuit fault, not a mechanical EVAP leak, so smoke testing the system is a waste of time until the solenoid circuit is verified.
  • The purge solenoid can fail intermittently when hot, so a resistance check on a cold engine may pass; test it again after warming the engine or use a lab scope to watch the current ramp.
  • Mazda PCMs are sensitive to aftermarket solenoids with incorrect resistance, so a cheap replacement can set the code again even though the part is new.
  • Corrosion inside the connector pins is a common cause on older Mazdas, and simply unplugging and reconnecting the connector can temporarily clear the fault, leading to a misdiagnosis.
  • This code does not mean the charcoal canister is saturated or the gas cap is loose; those faults set different EVAP codes, so avoid replacing those parts based on P1446 alone.

Can I keep driving with P1446?

You can continue driving with P1446 because the fault only affects evaporative emission control and does not compromise engine safety or performance. Avoid topping off the fuel tank and park in a well-ventilated area until the repair is made, as a stuck-open solenoid may allow fuel vapor to escape.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for Mazda vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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