EGR Problem

WARNING: This page does not describe the selected car, but rather 24 other vehicles, including the 1992 GMC Yukon, 1992 GMC Vandura Special, 1992 GMC Vandura, 1992 GMC Value Van, and 1992 GMC Suburban. 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 in this section.

CODE 45 ECM TERMINAL & CIRCUIT WIRING IDENTIFICATION

Application	ECM Terminal	Wire Color
All With 4L80-E
Oxygen Sensor Signal	C14	Purple
Oxygen Sensor Ground	C13	Tan
All Others Except 3.8L
Oxygen Sensor Signal	D7	Purple
Oxygen Sensor Ground	D6	Tan

Fig 1: Code 45, Schematic, Rich Exhaust Indication

Courtesy of GENERAL MOTORS CORP.

Fig 2: Code 45, Flow Chart, Rich Exhaust Indication

Courtesy of GENERAL MOTORS CORP.