EGR Problem

WARNING: This page does not describe the selected car, but rather 25 other vehicles, including the 1992 Oldsmobile Bravada, 1992 GMC Vandura Special, 1992 GMC Vandura, 1992 GMC Value Van, and 1992 GMC Sonoma. However, it is still accessible from the selected car via links, so may be relevant.

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.

CODE 45 ECM TERMINAL & CIRCUIT WIRING ID (ALL W/4L80-E A/T)

Application	ECM Terminal	Wire Color
O2 Sensor Signal	C14	Purple
O2 Sensor Ground	C13	Tan

CODE 45 ECM TERMINAL & CIRCUIT WIRING ID (ALL OTHERS)

Application	ECM Terminal	Wire Color
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

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.

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

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