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Home >> Chevrolet >> 2021 >> Trailblazer RS, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Engine Controls And Fuel - 1.0L (L4B L4F L4G LIJ) Or 1.2L (L4H L4K LIF LIH) - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC P0182, P0183, P0187, P0188, P0191, P0192, P111F, P126E, P126F, P127C, P128A, P128B, U0625, U0670, U0671, or U101B >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Ignition - On/Vehicle - In Service Mode
  2. Verify DTC P0641 is not set.
    • Go to next step: If the DTC is not set 
  3. Verify DTC P0182, P0183, P0187, P0188, P0191, P0192, P111F, P126E, P126F, P127C, P128A, P128B, P128C, P128D, P128F is not set.
    • If DTC P0182, P0183, P0187, P0188, P0191, P0192, P111F, P126E, P126F, P127C, P128A, P128B, P128C is set 

      Replace the component: B47B Fuel Rail Pressure Sensor

    • If DTC U0625, U0670, U0671, U101B is set 

      Refer to Circuit/System Testing

    • Go to next step: If none of the DTCs are set 
  4. Verify the scan tool parameter: Fuel Rail Temperature Sensor 1 = The parameter value should not change.

    Perform the action while monitoring the parameter:

    • Wiggle the harness and connector: B47B Fuel Rail Pressure Sensor
    • Wiggle the harness and connector: K20 Engine Control Module
    • If the parameter value changes 

      Repair as necessary - Wiring/Terminal(s)/Electrical Connector(s)

    • Go to next step: If the parameter value does not change 
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

    Verify the DTC does not set.

    • If the DTC sets 

      Refer to Circuit/System Testing

    • Go to next step: If the DTC is not set 
  6. All OK.