Trouble codes › P0520

P0520 Engine Oil Pressure Sensor/Switch "A" Circuit

Oil pressure

P0520 means the engine computer isn't getting a usable signal from the oil pressure sensor; check the oil level before assuming it's just the sensor.

The engine computer isn't getting a usable signal from the oil pressure sensor or switch. It's usually the sensor or its wiring, but it can't tell you on its own whether real oil pressure is fine.

Can I keep driving? Yes, but get it fixed soon.

Check the oil level first. If it's full and the engine sounds normal, it's usually the sensor; get it checked soon. If the oil light comes on with noise or ticking, stop the engine right away.

Common causes

  1. A failed oil pressure sensor or switch (common, and they often leak oil too)
  2. A damaged or oil-soaked connector or wiring
  3. Low oil level or actual low oil pressure (less common, but serious)

Symptoms

  • Oil pressure gauge reading zero, maximum or jumping around
  • Oil light flickering
  • Check-engine light

Common on: Ram 1500, Jeep Grand Cherokee, Jeep Wrangler, Dodge Grand Caravan, Dodge Durango

Known problems: Chrysler 3.6L Pentastar oil filter housing leak and oil pressure sensor · GM V8 oil pressure sensor and screen (P0521)

What to check first

  1. Check the oil level and condition.
  2. Inspect the sensor and connector for oil leaking into the plug.
  3. If the gauge reading is in doubt, have actual oil pressure checked with a mechanical gauge before replacing anything else.
  4. Replace the sensor with a quality part if wiring is good and real pressure is normal.

What does P0520 mean on your vehicle?

The likely cause depends on your engine. iRepair researches your exact year, make, model and engine (service bulletins, recalls and owner reports) and tells you what to check first. Your first 3 questions are free.

Ask iRepair about P0520

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Related codes

General guidance for P0520 on most vehicles. Some makers use the same code a little differently; confirm in the service information for your vehicle, put safety first, and see a professional when in doubt.