Broken Spark Plug Center Isolator

An engine misfire condition and DTC P0300 (Engine Misfire Detected) may be found on some 2016-2019 Cruze models with the 1.4L engine (RPO LE2); 2016-2019 Malibu models with the 1.5L engine (RPO LFV); 2016-2019 Spark models with the 1.4L engine (RPO LV7); 2016-2019 Volt models with the 1.5L engine (RPO L3A); and 2018-2019 Equinox and Terrain models with the 1.5L engine (RPO LYX).

If there is an engine misfire or engine misfire-related DTC set, remove the spark plugs from the engine and inspect for a broken center insulator by inverting the spark plug. Once the spark plug has been inverted, if the center insulator is broken, it will slide down the center electrode. (Fig. 27)


Fig. 27


If center insulator is broken, replace all four spark plugs. Clear any DTCs and evaluate engine performance.


– Thanks to Robert Halas

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