Damaged Crankshaft Position Sensor and Reluctor Ring

Some 2020-2021 Encore GX and 2021 Trailblazer models equipped with the 1.2L engine (RPO LIH) may have a no start condition and DTCs P0335 (Crankshaft Position Sensor Circuit) and P0336 (Crankshaft Position Sensor Performance) set in the Engine Control Module.

If these conditions are present, check for a possible oil leak from the rear of the engine. The engine crankcase pressure may have increased to abnormal levels due to an internal restriction in the cam cover PCV channel, causing the rear main seal housing cover (Fig. 16) to balloon and make direct contact with the crankshaft position sensor reluctor ring.

 

Fig. 16

 

Remove and inspect the crankshaft position sensor for any damage. If the crankshaft position sensor is not damaged, continue with diagnostics as outlined in the appropriate Service Information.

If the crankshaft position sensor is damaged, remove the crankshaft position sensor reluctor ring (Fig. 17) and inspect the rear main oil seal housing. If the crankshaft position sensor reluctor ring has cut through the rear main oil seal housing, there may be metal contamination in the engine oil, requiring engine replacement.

 

Fig. 17

 

If the crankshaft position sensor reluctor ring has not cut through the rear main oil seal housing, replace the crankshaft position sensor, reluctor ring, rear main oil seal housing, and camshaft cover.

For additional information, refer to #PIP5761.

 

– Thanks to Robert Halas

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