Code Definition

P1443 — Canister Control Vacuum Check Switch

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Infiniti

About P1443

P1443 is a manufacturer-specific powertrain diagnostic trouble code recorded for Infiniti vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1443 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

This code relates to the EVAP canister control vacuum check switch on these Nissan and Infiniti vehicles, a switch fitted in the vacuum line between the EVAP canister purge control solenoid valve and the purge control valve built into the canister. The switch reports the vacuum state to the Engine Control Module (ECM), sending an on signal when no vacuum is present and an off signal when vacuum is applied to the purge control valve. The ECM uses this purely for monitoring, commanding purge vacuum and then checking that the switch changes state as expected. DTC P1443 is set when the switch does...

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