P003A – Turbocharger/Supercharger Boost Control ‘A’ Position Exceeded Learning Limit

P003A Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P003A Possible Causes

Turbocharger or supercharger vane adjustment,Faulty turbocharger or supercharger

P003A Description

The position of the turbocharger vanes is controlled by the Engine Control Module (ECM). The ECM utilizes a turbocharger vane control solenoid valve and a turbocharger vane position sensor to control the turbocharger vanes. The ECM will vary the boost dependant upon the load requirements of the engine. The vane control solenoid valve uses 2 circuits, a high voltage control circuit and a low reference circuit. The ECM uses a pulse width modulation (PWM) on the high control circuit to control the solenoid valve. The ECM provides a ground on the low reference circuit. The ECM will detect if the automatic turbocharger learn has failed or the commanded position of the turbocharger vanes does not match the actual position by more than 15 percent.