DTC P0405 - EGR PINTLE POSITION CIRCUIT LOW VOLTAGE GMC Envoy I

Note. For circuit reference, see WIRING DIAGRAMS - 4.3L article.

Circuit Description

EGR is used to lower Oxides of Nitrogen (NOx) emission levels. VCM controls EGR pintle position using inputs from TP and MAP sensors. Scan tool can be used to monitor desired EGR position.

VCM supplies 5-volt reference and ground signal to EGR valve. Feedback signal is the actual position of the EGR pintle. Actual EGR position should always be close to commanded desired EGR position.

Conditions for setting DTC

1. DTCs P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0300, P0440, P0442, P0446, P0502, P0506, P0507, P1336, P1404 or P1441 not set.
2. Ignition voltage greater than 9 volts.
3. VCM sees less than 0.12 volt from EGR valve sensor.
4. Malfunction present for 10 seconds.