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.

Ignition ON.
Verify there are no DTCs set related to the following system/component:
- B17 Barometric Pressure Sensor
- B65 Intake Manifold Pressure and Air Temperature Sensor
- B75C Multifunction Intake Air Sensor
- B131 Exhaust Temperature Sensor
- B154 Diesel Particulate Filter Exhaust Differential Pressure Sensor
- If a related DTC is set
  Refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.
- Go to next step: If a related DTC is not set
Ignition ON, verify that the diesel particulate filter (DPF) Differential Pressure parameter is between 0 to +1 kPa (0 to +0. 14 PSI).
- If not within the specified range
  Refer to Circuit/System Testing.
- Go to next step: If within the specified range
Engine running, verify that the DPF Differential Pressure parameter is greater than 0 kPa (0 PSI).
- If not greater than 0 kPa (0 PSI)
  Refer to Circuit/System Testing.
- Go to next step: If greater than 0 kPa (0 PSI)
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed in the Freeze Frame/Failure Records data.
Verify the DTC is not set.
- If the DTC is set
  Refer to Circuit/System Testing.
- Go to next step: If no DTC is set
All OK.