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P0523 — Engine Oil Pressure Sensor/Switch Circuit High Input

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

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

Check first: Check sensor circuit continuity

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CautionLubricationLimp to the next safe stop

Seen on: Heavy Truck

What P0523 means

Engine Oil Pressure Sensor/Switch Circuit High Input. Common causes: Oil pressure sensor signal high.

How serious is it?

Caution. Limp to the next safe stop.

Most likely causes

  1. Oil pressure sensor signal high
  2. Open circuit
  3. failed sensor

First moves (roadside)

  1. Check sensor circuit continuity
  2. replace sensor

FAQ

What does P0523 mean?

Engine Oil Pressure Sensor/Switch Circuit High Input. Common causes: Oil pressure sensor signal high.

How serious is P0523?

Caution — Limp to the next safe stop.

What's the most likely cause of P0523?

The most common cause is: Oil pressure sensor signal high. Other possibilities include Open circuit; failed sensor.

Can I keep driving with P0523?

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 P0523, 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.