Some possible causes of a P0171 engine code are Vacuum leak Weak fuel pump Broken fuel pressure regulator Blocked fuel filter Faulty powertrain control module Defective injectors Faulty oxygen sensors Clogged catalytic converter Problems with the mass airflow sensor Right out of the book.
2002 GMC Sierra 1500 engine code p0171
2002 GMC Sierra 1500 SLE Extended Cab LB
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Maintenance & Repair
There is a lot of questions but not much for answers 1997 Gmc , idles fine /like new / touch the gas and it stumbles and stalls? Repairs done inc a new fuel pump , up stream O2 sensor, switched ou...
1997 GMC Sierra 1500 K1500 SLT 4WD Extended Cab SB
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Maintenance & Repair
Engine lite on. Idling rough missing a little going down the road..2006 gmc sierra sle 4x4. I need someone to tell me how to fix it. Took it to Chevrolet dealship in Clinton, nc. Had there twice n...
2006 GMC Sierra 1500 SL1 Extended Cab 6.5 ft. 4WD
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Maintenance & Repair
Engine lite on. Idling rough missing a little going down the road..2006 gmc sierra sle 4x4. I need someone to tell me how to fix it. Took it to Chevrolet dealship in Clinton, nc. Had there twice n...
2006 GMC Sierra 1500 SL1 Extended Cab 6.5 ft. 4WD
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Maintenance & Repair
when starting the truck it jumps up to 3000 rpms. what would cause this or what to look for and how to fix it
2007 GMC Sierra 1500 SLE1 Ext. Cab LB 2WD
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Maintenance & Repair
2002 GMC Sierra 1500
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