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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 94 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Diagnostic Information And Procedures (3 Of 3)) >> Diagnostic Information and Procedures >> DTC P227B-P227E >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition - On / Vehicle - In Service Mode
  2. Verify DTC P0107, P0108, P0641, P0651, P0697, P06A3, P2228, P2229 is not set.
    • Go to next step: If none of the DTCs are set
  3. Determine the current vehicle testing altitude.
  4. Verify the scan tool parameter: MAP Sensor = The value should be within the range listed in the table: Altitude Versus Barometric Pressure
    • Go to next step: If in the specified range 
  5. Verify the scan tool parameter: BARO Sensor 1 = The value should be within the range listed in the table: Altitude Versus Barometric Pressure
    • Go to next step: If in the specified range 
  6. Verify the scan tool parameter: BARO Sensor 2 = The value should be within the range listed in the table: Altitude Versus Barometric Pressure
    • If not in the specified range 

      Refer to: Circuit/System Testing

    • Go to next step: If in the specified range 
  7. Verify the scan tool parameter: BARO Sensor 2 = The value should not spike or drop out.

    Perform the action while monitoring the parameter:

    • Wiggle the harness and connector: B75C Multifunction Intake Air 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
  8. 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 
  9. All OK.
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