What is the p15a1 code for the chevy equinox?

Diagnostic trouble code (DTC) P15A1 on the Chevrolet Equinox (and other OBD-II equipped vehicles, which is most) indicates "Fuel Economy Mode Switch Performance", which can be the result of a bad fuel economy mode switch, an open or shorted harness, or a poor electrical connection. Luckily, it's not a very general code, as You know for certain that the issue will be with Your fuel economy mode switch. This component is what takes You in and out of "Eco" mode, MINImizing horsepower but maximizing fuel efficiency. With that said, it's not a critical one to replace if Eco isn't that important to You, which is noteworthy because the fix can be moderately expensive if You need to replace the entire component.