P0446 on Chevrolet vehicles A fault in the evaporative vent control circuit

A model year is listed because the code is named in its own record — a bulletin filed against it, or an owner’s complaint about it — not because every one of these vehicles sets it. Counts are documents in NHTSA’s files, not failure rates.

Bulletins and campaigns Chevrolet filed with NHTSA whose summary names P0446. Quote the document number at the service desk — it is a diagnosis the maker has already written down.

• 23-NA-073 Service bulletin
  2023-06-19 · Engine And Engine Cooling
• This technical bulletin provides repair information to correct a customer concern of Evaporative DTCs P0442, P0446, P0455 or P0449, Caused by Dust Intrusion into the Evaporative Canister.
• 23-NA-073 Service bulletin
  2023-09-20 · Engine And Engine Cooling
• This technical bulletin provides repair information to correct a customer concern of Evaporative DTCs P0442, P0446, P0455 or P0449, Caused by Dust Intrusion into the Evaporative Canister.
• 23-NA-073 Service bulletin
  2024-02-26 · Engine And Engine Cooling
• This technical bulletin provides repair information to correct a customer concern of Evaporative DTCs P0442, P0446, P0455 or P0449, Caused by Dust Intrusion into the Evaporative Canister.
• PIC6250 Service bulletin
  2017-01-11 · Engine And Engine Cooling — Exhaust System — Emission Control
• This Preliminary Information communication provides information to the technician about vehicles that have a check engine light. Technician will find Diagnostic Trouble Code P0446. Technician will need to replace the Evaporative Emissions System canister if spider nesting in the fresh air inlet port.
• PIC6250A Service bulletin
  2017-01-26 · Engine And Engine Cooling — Exhaust System — Emission Control
• This Preliminary Information communication provides information to the technician about vehicles that have a check engine light. Technician will find Diagnostic Trouble Code P0446. Technician will need to replace the Evaporative Emissions System canister if spider nesting in the fresh air inlet port.
• PIC6250B Service bulletin
  2017-02-28 · Equipment — Other — Owners/Service/Other Manual
• This Preliminary Information communication provides information to the technician about vehicles that have a check engine light. Technician will find Diagnostic Trouble Code P0446. Technician will need to replace the Evaporative Emissions System canister if spider nesting in the fresh air inlet port.
• PIE0455 Service bulletin
  2018-03-01 · Engine And Engine Cooling — Exhaust System — Emission Control
• This engineering information bulletin is requesting information from the field on vehicles that have the condition of Malfunction Indicator Illuminated with DTC P0446 Set.
• 17NA233 Service bulletin
  2019-11-21 · Electrical System
• This technical bulletin provides a procedure to correct a condition of an MIL Illuminated with DTC P0446 Set.
• 17NA233 Service bulletin
  2020-02-11 · Fuel System, Other
• This technical bulletin provides a procedure to correct a condition of an MIL Illuminated with DTC P0446 Set.
• 23-NA-073 Service bulletin
  2024-10-07 · Engine
• This technical bulletin provides repair information to correct a customer concern of Evaporative DTCs P0442, P0446, P0455 or P0449, Caused by Dust Intrusion into the Evaporative Canister.
• 23-NA-073 Service bulletin
  2025-03-13 · Engine
• This technical bulletin provides repair information to correct a customer concern of Evaporative DTCs P0442, P0446, P0455 or P0449, Caused by Dust Intrusion into the Evaporative Canister.
• PIT6510 Service bulletin
  2026-04-25 · Unknown Or Other
• This PI describes the repairs to perform if P0446 set and water and/or ice is found on the fuel pump module.

A stored code names the test that failed, never the part that caused it. The record above is what Chevrolet and its owners have filed about it; the code’s page across every make has the whole file.