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Circuit/System Verification

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify that DTCs P003A, P0047, P0048, P0101, P0201-P0208, P0234, P0299, P02A1, P02A5, P02AD, P02B1, P02B5, P02B9, P029D, P0300-P0308, P0401, P0402, P046C, P0545, P0546, P2032, or P2033 are not set.
  2. Verify that leaks do not exist in the exhaust system. Refer to Exhaust Leakage .
  3. Engine running at idle, perform the following:
    1. Engine coolant temperature greater than 80°C (176°F).
    2. Command the EGR solenoid with a scan tool to 25 percent.
    3. Perform several accelerator pedal sweeps by rapidly depressing the accelerator pedal to wide open throttle (WOT) and returning the pedal to the at rest position, allowing the engine to return to idle speed for 5 seconds, while observing the exhaust from the tailpipe. There should be very light or no smoke visible from the tailpipe.
    • If a heavy black smoke is observed from the vehicles tailpipe, replace the particulate filter assembly.
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