The exhaust gas recirculation (EGR) solenoid and pintle valve assembly serve to reduce the temperature of combustion by introducing non-volatile exhaust gas into the combustion chambers. The voltage on the EGR solenoid signal wire should be between 0 and 5 volts. This voltage is monitored continuously. If the ECM sees that the signal voltage is lower than expected, this code will set.

DTC P1403 will set if the EGR Feedback Signal is less than expected when:

P1403 is a (type B) DTC.

To locate an intermittent problem, use the scan tool to monitor EGR Sensor with engine running.

Wiggling wires while monitoring EGR sensor may locate the area where a short to ground exists.