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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 929 (Engine Controls And Fuel - 4.8L, 5.3L, 6.0L And 6.2L - DTC P0010 To DTC P230) >> DTC P0191 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 GMC Sierra, 2007 GMC Cab & Chassis Sierra, 2007 Chevrolet Silverado, and 2007 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, vary the engine speed with the accelerator pedal. Verify that P0191 does not set as current.
    • If the DTC sets as current, test the fuel line pressure sensor signal circuit for a high resistance. If the circuit tests normal, replace the fuel line pressure sensor.
  2. If the DTC does not reset in the FPCM, the system is OK. Do not replace the FPCM.
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