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DTC P0403: EGR Solenoid Control Circuit: Description

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

Powertrain Control Module (PCM) monitors Exhaust Gas Recirculation (EGR) valve pintle position input to ensure valve responds properly to PCM commands. The linear EGR valve is controlled by using an ignition positive driver and ground circuit within the PCM. The driver has the ability to detect an electrical malfunction in the EGR solenoid high control circuit or EGR low control circuit. If an electrical malfunction occurs, the driver signals the PCM to set this DTC.

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