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Home >> Chevrolet >> 2009 >> HHR SS, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Engine Controls And Fuel - 2.2L Or 2.4L - DTC P0010 To DTC P0366) >> DTC P0300-P0304 >> Conditions for Setting the DTC

Conditions for Setting the DTC

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The ECM is detecting a crankshaft rotation speed variation indicating a misfire sufficient to cause emission or catalytic converter damaging levels to exceed mandated standards.