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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1046 (Engine Controls And Fuel - 6.6L - DTC P0016 To DTC P02E0) >> DTC P0191 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: Fuel pressure control will be disable if DTC P0087, P0088, P0192, or P0193 are set. Codes must be cleared to enable the device control.
  1. Turn OFF the ignition.
  2. Disconnect the ECM connector and the fuel pressure regulator connector.
  3. Test the fuel pressure regulator solenoid supply voltage circuit for a short to voltage.
  4. Disconnect the FRP sensor.
  5. Test the FRP signal circuit, the 5-volt reference circuit, and the low reference circuit for high resistance.
    • If all circuits test normal, replace the FRP sensor.
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