P0174 on the 2005 GMC Sierra
The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.
Nobody has written a description of this code yet.
| 612 | 2005-08-12. Service bulletin. SERVICE ENGINE SOON LIGHT ILLUMINATED. DIAGNOSTIC TROUBLE CODE (DTC) P0171 AND/OR P0174 (LEAN FUEL TRIM) MAY BE SET. MASTER CYLINDER O-RING DAMAGED. GM TECH LINK. *TT |
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| 3232 | 2005-05-11. Service bulletin. 1999 - 2005 GEN II COLD ENGINE MISFIRE AT IDLE WITH POSSIBLE P0171 AND/OR P0174. *TT |
| 3250 | 2005-01-27. Service bulletin. SERVICE ENGINE SOON LIGHT ILLUMINATED WITH DIAGNOSTIC TROUBLE CODE P0171 OR P0174 SET. THE ROOT CAUSE MAY BE A DAMAGED OR MISSING SEAL FROM THE MASTER CYLINDER TO THE BRAKE BOOSTER. *EH |
3 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.