P0443 fault code: Evaporative Emission System Purge Control Valve Circuit

P0443 means “Evaporative Emission System Purge Control Valve Circuit” — an auxiliary emission controls fault in the powertrain.

Can I DIY?

Professional-only boundary. You can read P0443; do not power, probe or replace the purge solenoid yourself.

This is the conservative boundary from the reviewed code record. This page has no frozen site-wide safety grade, so it does not publish a repair route.

What to tell the garage about P0443

Do not drive until checked. The computer has flagged the electrical circuit that drives the EVAP purge control valve, the solenoid that lets tank vapour into the intake. This is a wiring or solenoid-circuit alert, not a measured leak.

Take these reviewed, code-specific details with you. They help the garage confirm the fault without turning this page into a repair procedure.

  • Evaporative Emission System Purge Control Valve Circuit: Registration number
  • Evaporative Emission System Purge Control Valve Circuit: Exact code P0443 and any high/low/open wording from the reader
  • Evaporative Emission System Purge Control Valve Circuit: Whether the engine management light is steady or flashing
  • Evaporative Emission System Purge Control Valve Circuit: Whether a labelled purge-valve plug was visible and fully seated
  • Evaporative Emission System Purge Control Valve Circuit: Hybrid or EV: mention orange cabling if it is near the valve area
P04xxAuxiliary emission controls
MOT fail riskif the warning light stays on

What does P0443 mean?

P0443 is a generic (SAE standard) powertrain code reported by your car’s engine control unit. It sits in the P04xx block, which covers auxiliary emission controls. The stored description is “Evaporative Emission System Purge Control Valve Circuit”. The code itself tells you which circuit or system tripped the fault — not always the exact part that failed.

Will P0443 fail an MOT?

An illuminated engine management light for a purge-valve circuit fault is a Major MOT defect until the lamp stays off after repair. MOT does not require you to prove the solenoid yourself at the test.

Before booking your test, check what usually fails on your car: see our MOT pass rates by make and model, built from 33.1 million DVSA tests.

Related guides

Car diagnostic test cost: compare the scopeUK booking marketplaces currently publish diagnostic averages of about £52–£65. Engine management light on: steady or flashing?A steady engine management light means the computer has stored a fault. Drive with caution and get the code read. A flashing light is different — stop when it is safe.
P0400Exhaust Gas Recirculation Flow P0401Exhaust Gas Recirculation Flow Insufficient Detected P0402Exhaust Gas Recirculation Flow Excessive Detected P0403Exhaust Gas Recirculation Control Circuit P0404Exhaust Gas Recirculation Control Circuit Range/Performance P0405Exhaust Gas Recirculation Sensor 'A' Circuit Low P0406Exhaust Gas Recirculation Sensor 'A' Circuit High P0407Exhaust Gas Recirculation Sensor 'B' Circuit Low

P0443 — quick answers

Is it safe to drive with P0443?

Do not drive until checked. We have no verified driving guidance for P0443. Treat as do not drive until checked. A circuit flag is not a licence to probe or power the purge solenoid at home.

Will P0443 fail my MOT?

An illuminated engine management light for a purge-valve circuit fault is a Major MOT defect until the lamp stays off after repair. MOT does not require you to prove the solenoid yourself at the test.

Fault-code identifiers are standard diagnostic facts. Their explanations and diagnostic guidance on this site are original editorial summaries, not reproduced SAE wording. MOT defect rules reflect the DVSA MOT inspection manual (2026). This page is general guidance for UK drivers, not a substitute for a professional diagnosis.