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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 921 (Engine Exhaust System) >> Diagnostic Information and Procedures >> Restricted Exhaust >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: While engine is operating, the exhaust system will become extremely hot. To prevent burns avoid contacting a hot exhaust system.
IMPORTANT: Do not replace a restricted particulate filter. Repair the engine condition that clogged the particulate filter, and then attempt to perform a service regeneration. Refer to Exhaust Particulate Filter Cleaning (DPF Service Regeneration)  or Exhaust Particulate Filter Cleaning (DPF Regeneration Enable) .

If the vehicle is equipped with a 6.6 L diesel engine do not perform this diagnostic. The exhaust system does not have a location for installing the J 35314-A  Exhaust Back Pressure Gage. See Special Tools . Instead remove the suspect component, operate the vehicle, verify for improved performance. If performance is improved then replace the faulty component.

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