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 / Vehicle - In Service Mode
Verify there are no DTCs set related to the following system/component:
- B34 Engine Coolant Temperature Sensor
- B66 Intake Air Temperature Sensor
- B75C Multifunction Intake Air Sensor
- Fuel System
- If a related DTC is set
  Refer to: Diagnostic Trouble Code (DTC) List - Vehicle
- Go to next step: If a related DTC is not set
Verify the scan tool parameter: EGR Temperature Sensor 1, = -39 to 999°C (-38 to 1, 30°F)
- If not the specified value
  Refer to: Circuit/System Testing
- Go to next step: If the specified value
Verify the scan tool parameter: EGR Temperature Sensor 1, & IAT Sensor 2 = Not within 20°C (36°F) of each other
- If not the specified value
  Refer to: Circuit/System Testing
- Go to next step: If the specified value
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
All OK.