P1443 is a diagnostic trouble code indicating a fault in the evaporative emission (EVAP) control system, specifically with a control valve such as the purge valve, vent valve, or canister close valve. The powertrain control module (PCM) has detected an electrical or functional problem in this valve or its circuit, and the EVAP system can no longer properly route or seal fuel vapors between the fuel tank and the engine intake.
The valve itself is the most common cause. Internal solenoid coil failure or mechanical sticking prevents proper vapor flow control.
Rubber hoses between the canister, valves, throttle body, and fuel tank can develop splits, loose clamps, or disconnections over time.
Corroded pins, broken wires, or chafed insulation between the valve and the PCM can produce the same fault code.
Less common, but a fuel-saturated or physically cracked canister can prevent the EVAP system from functioning correctly.
A leaking fuel cap can affect EVAP system pressure and trigger related codes, though it more often sets a different P-code.
Genuine PCM failure is rare for this code. It should only be considered after the valve, hoses, wiring, and canister have all been ruled out by testing.
Yes, in most cases the vehicle remains safe to drive. The code is emissions-related and typically does not affect engine performance, safety, or immediate drivability.
Almost never. The code is triggered by an input from the valve circuit, and in the vast majority of cases the actual valve, hoses, or wiring are at fault. Replacing the PCM without first testing those other components is one of the most common and expensive mistakes made for this code.
It can clear if the underlying condition was temporary, such as a fuel cap that was not fully tightened. Once the EVAP monitor runs again, however, the code typically returns until the actual fault is repaired.