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 that DTC P00C7, P0045, P0047, P0048, P0101, P0102, P0103, P0106, P0107, P0108, P0400 - P0402, P16B0 - P16B2, P169E, P169F, P2227 - P2230, P2598, or P2599 is not set.
- If any of the DTCs are set
  Refer to Diagnostic Trouble Code (DTC) List - Vehicle
- Go to next step: If none of the DTCs are set
Verify the scan tool MAP Sensor parameter is within the range listed in the following table: Altitude Versus Barometric Pressure .
- If not within the specified range
  Refer to Circuit/System Testing.
- Go to next step: If within the specified range
Engine running.
Verify the scan tool Turbocharger Vane Position parameter increases and decreases when commanding the Turbocharger Vane Position to 80% and then back to 10% with a scan tool.
- If the parameter does not increase and decrease
  Refer to Circuit/System Testing.
- Go to next step: If the parameter increases and decreases
Exit the control function and increase the engine speed to 2, 500 RPM.
Verify the MAP Sensor parameter increases with Desired Boost Pressure parameter.
- If the MAP Sensor parameter does not increase
  Refer to Circuit/System Testing.
- Go to next step: If the MAP Sensor parameter does increase
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.
- If any DTCs set
  Refer to Circuit/System Testing.
- Go to next step: If none of the DTCs set
All OK.