Oil Leak after 2.5L Engine Cylinder Head Replacement

After the cylinder head has been replaced on some 2014-2015 Impala and Malibu models equipped with the 2.5L 4-cylinder engine (RPO LKW), an external oil leak may be found, random misfires may occur on all cylinders when the camshaft is on low lift with light throttle, and DTCs P16D0 (Intake Rocker Arm Solenoid Valve 2 Stuck Off) and P0300 (Engine Misfire Detected) may be set. If these conditions are found, check for the presence of several oil galley plugs.

If the cylinder head has an external oil leak, verify that oil galley plugs #5 and #6 have been installed. (Fig. 19, #5, #6)

If DTC P16D0 and/or P0300 are set or a random misfire occurs on all cylinders only when the camshaft lobe is on low lift, verify that oil galley plug #10 has been installed. (Fig. 19, #10) The #10 oil galley plug, located in the cylinder head behind the timing cover, would have an oil leak that is internal to the engine.

In addition, check that oil galley plugs #9 are installed. (Fig. 19, #9) These plugs should have come installed in the new cylinder head.

Fig. 19

For additional information, refer to #PIP5302A.

– Thanks to David Rutkowski

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