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Models: 2008-2009 Chevrolet Colorado, TrailBlazer 2008-2009 GMC Canyon, Envoy 2008-2009 HUMMER H3, H3T 2008-2009 Saab 9-7X All Equipped With Engine RPOs LLR, LLV, LL8 Please Refer to GMVIS Condition Some customers may comment that the malfunction indicator lamp (MIL) is illuminated. Some customers may also comment that the engine runs rough. The technician may find DTCs P0300, P0301, P0302, P0303, P0304, P0305, or P0306 set as current or in history, depending on which engine the vehicle is equipped with. Upon further examination, the technician may observe evidence of water intrusion into the spark plug recess area. Cause This condition may be caused by an engine being exposed to a large quantity of water, which may result in some of the water seeping down past the vented threads of an ignition coil bolt, then flowing through the vent opening that is located in the bottom of the related ignition coil bolt hole, and collecting in the spark plug recess area. Correction Important: DO NOT reprogram or replace the engine control module (ECM) for this condition. If evidence of water intrusion in the spark plug recess area/s is not observed, then refer to the appropriate DTC procedures in SI.
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