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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 20 (Engine Controls And Fuel - 4.3L (LV1) - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC P0191, P0192, P127C, P128A, P128B, P16E4, or P16E5 >> 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 the scan tool parameter : Fuel Rail Temperature Sensor 1 = -39 to 115°C (-39 to 240°F)
    • If not between -39 and 115°C (-39 and 240°F) 

      Refer to : Circuit/System Testing

    • Go to next step : If between -39 and 115°C (-39 and 240°F) 
  3. Verify the scan tool parameter : Fuel Rail Temperature Sensor 1 & Fuel Rail Temperature Sensor 2 = Within 10°C (50°F) of each other
    • If not within 10°C (50°F) of each other 

      Refer to : Circuit/System Testing

    • Go to next step : If within 10°C (50°F) of each other 
  4. Verify the scan tool parameter : Fuel Rail Temperature Sensor 1 = The value should not spike or drop out.

    Perform the action while monitoring the parameter :

    • Wiggle the harness and connector : B310 Fuel Pressure/Temperature Sensor
    • Wiggle the harness and connector : K20 Engine Control Module
    • If the value spikes or drops out 

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

    • Go to next step : If the value does not spike or drop out 
  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.
  6. 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 
  7. All OK.
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