Circuit/System Verification
WARNING: This page is about a different car, the 2007 GMC Sierra, 2007 GMC Cab & Chassis Sierra, 2007 Chevrolet Silverado, and 2007 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Verify that DTCs P0652 or P0653 are not set.
- If the DTCs are set, refer to DTC P0652 or P0653 .
- Verify the integrity of entire DPF system by inspecting for the following conditions:
- Damaged components
- Loose or improper installation
- Leaks or restrictions in the exhaust differential pressure lines or hoses. The pressure lines should have a continuous downward gradient, without sharp bends, or kinks from the pressure sensor to the exhaust filter assembly.
- Ignition ON, observe the scan tool Particulate Filter Pressure Variance parameter. The value should be between -1.0 kPa to +0.3 kPa.
- Engine running at idle, observe the scan tool Particulate Filter Pressure Variance parameter. The value should be between 0-3 kPa.
- 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.