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Fault codes › P04xx — Emission controls › P0446

P0446

MODERATE

Evaporative Emission Control System Vent Control Circuit Malfunction

What this code means

Evaporative Emission Control System Vent Control Circuit Malfunction. Catalytic converter, exhaust gas recirculation, particulate filter, fuel vapour. These faults rarely leave you stranded, but they fail the roadworthiness test and become expensive if left alone.

How to read this code

  • PPowertrain
  • 0standardised code
  • 4Emission controls
  • 46P0446

The letter P names the system: Powertrain. The digit 0 that follows marks a standardised code, shared by all manufacturers code. The next digit, 4, locates the fault: emission controls.

What to do

Have it checked this week. The car remains usable, but the fault will not clear itself and will fail the roadworthiness test.

Clearing a code switches the light off but repairs nothing: if the fault remains, the code comes back.

Nearby codes

P0446

System
Powertrain
Fault family
Emission controls
Severity
MODERATE
Origin
Standardised generic code
Read this code on your own car

Klaro shows this code and the others in plain words, alongside live engine data. An OBD2 adapter is required, sold separately.

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