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P0520 — Engine Oil Pressure Sensor/Switch Circuit Malfunction

What it means: Engine Oil Pressure Sensor/Switch Circuit Malfunction.

How serious / can you keep driving: Caution. Limp to the next safe stop.

Check first: Check oil pressure with mechanical gauge

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CautionLubricationLimp to the next safe stop

Seen on: Heavy Truck

What P0520 means

Engine Oil Pressure Sensor/Switch Circuit Malfunction. Common causes: Oil pressure sensor circuit fault.

How serious is it?

Caution. Limp to the next safe stop.

Most likely causes

  1. Oil pressure sensor circuit fault
  2. Wiring fault
  3. failed sensor

First moves (roadside)

  1. Check oil pressure with mechanical gauge
  2. compare to sensor reading
  3. replace sensor

FAQ

What does P0520 mean?

Engine Oil Pressure Sensor/Switch Circuit Malfunction. Common causes: Oil pressure sensor circuit fault.

How serious is P0520?

Caution — Limp to the next safe stop.

What's the most likely cause of P0520?

The most common cause is: Oil pressure sensor circuit fault. Other possibilities include Wiring fault; failed sensor.

Can I keep driving with P0520?

Limp to the next safe stop. When in doubt, get a qualified mobile diesel tech on the truck before continuing.

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Related codes

Codes that commonly appear alongside P0520, or share the same subsystem.

Same symptom: Low oil pressure

Other codes a driver sees as an oil-pressure or oil-level warning.

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General diagnostic guidance for diesel engines (Cummins, Detroit, PACCAR, Volvo, Mack and more). Not a substitute for a scan-tool diagnosis on your specific truck.