What's the p1442 code Lexus gx470?

On Lexus and Toyota vehicles -- including Your GX470 -- You can typically trace diagnostic trouble code P1442 back to the vacuum switching valve (VSV). The code indicates that the valve is stuck closed, which can be the result of a faulty valve itself, degraded wiring, or in rare cases, communication issues with the engine control module (ECM). Typically, You won't notice any performance related symptoms with DTC P1442; the check engine light is likely the only way You'll know that You're having an issue. However, if not fixed within a reasonable timeframe, the vacuum switching valve may cause You larger issues down the road, so it's probably best to take care of the issue before it snowballs into something larger.