The P0520 code in your 2013 Jeep Wrangler indicates an oil pressure sensor circuit malfunction, which on the 3.6L Pentastar V6 is commonly related to the oil filter housing where the sensor is mounted. The plastic oil filter housing on this engine is known to crack and leak, potentially affecting oil pressure sensor readings and operation.
Understanding the Oil Filter Housing Issue
The 2013 Wrangler's 3.6L Pentastar engine uses a plastic oil filter housing that contains the oil filter, cooler passages, and oil pressure sensor mounting point. This housing is prone to cracking, particularly around the sensor mounting area and where it bolts to the engine block. Cracks allow oil leakage and can affect sensor readings, triggering P0520.
Identifying Housing Leaks
Common signs include oil pooling on top of the transmission or dripping from the engine area, oil smell when the engine is hot, visible oil residue around the filter housing, and low oil level without other obvious leaks. The crack may not be visible without close inspection—oil seeping from the housing area warrants a detailed look at the plastic components.
Diagnostic Process
Clean the oil filter housing area thoroughly and run the engine to identify fresh leak locations. Inspect the housing for visible cracks, particularly around sensor mounting points and gasket surfaces. Test the oil pressure sensor separately—remove and bench test if possible. Verify actual oil pressure with a mechanical gauge if sensor readings seem incorrect. Check all housing-to-block gasket surfaces.
Repair Solutions
If the housing is cracked, replacement is required. Chrysler/Mopar has released revised housings made of more durable material—use the updated part. When replacing the housing, also replace the oil pressure sensor, filter, and all gaskets and O-rings. Some aftermarket companies offer aluminum replacement housings that eliminate the plastic failure point entirely, though they cost more than OEM parts.