DTC P0403: EGR Flow Malfunction: Condition
WARNING: This page is about a different car, the 2003 Suzuki Vitara. However, it is still accessible from the selected car via links, so may be relevant.
DTC is set when Engine Control Module (ECM) commands EGR valve to turn OFF and detects low voltage at EGR stepper motor for a predetermined amount of time continuously. MIL is illuminated when ECM detects malfunction during one drive cycle. Possible causes are:
- ECM malfunction.
- EGR circuit malfunction.
- EGR valve malfunction.