EGR Problem

EGR valve sticking open at idle is usually accompanied by a rough idle and/or stalling. If Code 45 is intermittent, see INTERMITTENTS in TESTS W/O CODES article in this section.

CODE 45 ECM TERMINAL & CIRCUIT WIRING IDENTIFICATION

Application	ECM Terminal	Wire Color
All W/4L80-E Transmission
O2 Sensor Signal	C14	Purple
O2 Sensor Ground	C13	Tan
All Others
O2 Sensor Signal	D7	Purple
O2 Sensor Ground	D6	Tan

Fig 1: Code 45 Schematic (Except 4.3L Turbo) Rich Exhaust Indication

Fig 2: Code 45 Flow Chart (Except 4.3L Turbo) Rich Exhaust Indication