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P1191 Diagnostic Trouble Code Discussion for July 2006

Intake Air Duct Air Leak

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Trouble Ticket Help Requests for DTC P1191
Help Request Posted
1998 GMC C2500 Sierra SL 6.5L MIL Lamp on VIN: 1GTFC24S4W
P1191: Intake Air Duct Leak. Hello Techs, Intermittent DTC P1191 (Intake Air Duct Leak), P0101 (MAF Sensor Performance), P0400 (EGR System Performance) stored in PCM memory. Inspected intake air ducting, no problem detected. We have resealed upper and lower intake manifold gaskets along w...
July 02, 2006