Conditions for Setting the DTC
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Engine OFF, the ECM detects that the differential pressure is greater than or less than the calibrated threshold for 0.5 second.
OR
- Engine running, the ECM detects that the differential pressure is greater than or less than the calibrated threshold for 1 second.
OR
- The ECM detects that the differential pressure does not respond relative to an increase or decrease in exhaust flow for greater than 1 second.