Possible causes
– Faulty Oxygen sensor
– Ignition problem
– Fuel injection problem
– Engine mechanical condition
– Ignition problem
– Fuel injection problem
– Engine mechanical condition
Tech notes
There is a factory service bulletin for the following GMC models:
2000-2008 GMC Sonoma
2000-2008 GMC Sierra
2000-2008 GMC Yukon
2000-2008 GMC Yukon XL
2001-2008 GMC Denali
2001-2008 GMC Denali XL
2001-2008 GMC Savana
2002-2008 GMC Envoy
2002-2008 GMC Safari
2002-2008 GMC Jimmy
2000-2008 GMC Factory Service Bulletin OBDII Code P1174
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P1174 GMC Description
The Engine Control Module (ECM) performs a fuel trim cylinder balance utilizing the HO2S, when the calculated accumulated voltage exceeds a predetermined level this code is set
GMC Technical Service Bulletins for P1174 code
2007 GMC SIERRA 1500 FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM:INJECTORS
2007 GMC SIERRA 2500 FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM:INJECTORS
2007 GMC SIERRA 3500 FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM:INJECTORS
2007 GMC YUKON FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM:INJECTORS
2007 GMC YUKON XL 1500 FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM:INJECTORS
2007 GMC YUKON XL 2500 FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM:INJECTORS
2008 GMC SIERRA FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM:INJECTORS
2008 GMC SIERRA 1500 FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM:INJECTORS
2008 GMC SIERRA 2500 FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM:INJECTORS
2008 GMC SIERRA 3500 FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM:INJECTORS