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Posted on Nov 09, 2010
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I HAVE A ENGINE CODE OF P0171 AND P0174? - 2003 GMC Sierra 2500HD

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  • Master 387 Answers
  • Posted on Nov 09, 2010
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Joined: Jun 18, 2010
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This code are similar to engine misfire, chek the fuel system and pressure, air intake ratio, (injectors, fuel pump, maf, iac, vacuum hose, intake manifold), you mustcheck all this.

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Im getting P0171 code- lean .

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2001 GMC SIERRA 1500 4X4 CODES P0171 AND P0174 CHECK ENGINE LIGHT IS ON WONT PASS EMISION

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Code p0171 and p0174

P0171 possible cheap fix
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Engine light on

P0171 ; Fuel Trim System Lean (Bank 1)
P0174; Fuel Trim too Lean (Bank 2)
fuel trim is system to modify injector pulse if system go lean it will go rich when the system is too much lean and is max.rich it code
look for 02 sensor bank 1 and 2 data
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code P0171 P0174?? sorry these are not nissan codes but the code readers own codes so return to where the reading was done and ask them
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