In addition to the P003A code triggering the Check Engine Light to come on, the vehicle may display other symptoms, such as:

It may also be accompanied by other OBD-II trouble codes, such as P2563. When the ECM detects an improper range of motion within the turbo- or supercharger through the on-board computer circuitry, it registers the P003A code and turns on the Check Engine Light on the vehicle’s dashboard. Such a misalignment can cause the engine to rev up to such a degree that other components of the system may be affected or damaged, such as push rods or rockers, due to an improper range of motion.

In the most basic sense, the registration of the P003A code means the ECM noted a misalignment in the boost control A within the engine’s turbocharging or supercharging system. The P003A OBD-II trouble code indicates the Electronic Computer Module (ECM) has detected an issue in the turbocharger or supercharger system, specifically about readings being outside acceptable parameters in regards to the engine’s boost.

Isuzu idss ib11-j-003a