P0523 Code: Engine Oil Pressure Sensor/Switch A High Input
🟠 Moderate severity · drivable
Drivable, but first verify the oil level and check for a real oil pressure problem before driving far.
What P0523 means
The engine oil pressure sensor is sending a voltage that is too high, outside the range the computer expects. The sensor measures oil pressure so the gauge and warning light can work. A high input is usually an electrical fault, but it can also appear with genuinely high oil pressure from a blockage or wrong oil viscosity.
Symptoms
- Check engine light is on
- Oil pressure gauge reading pegged high
- Oil pressure warning light on
- Possible engine noise if oil pressure is actually wrong
Common causes
- most common: Faulty oil pressure sensor
- common: Short to voltage in sensor wiring
- common: Corroded sensor connector
- less common: Blocked oil passage causing real high pressure
- rare: Wrong oil viscosity or overfilled oil
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Replace the oil pressure sensor | Yes | $30–120 |
| Check the oil level and confirm oil pressure with a gauge | Yes | $0–50 |
| Repair damaged sensor wiring | Mechanic | $50–200 |
Frequently asked questions
Can I drive with a P0523 code?
Yes, but check the oil level first and make sure the engine has real oil pressure. If the engine is noisy, do not drive it.
Does P0523 mean my oil pressure is actually too high?
Not usually. Most of the time the sensor or its wiring is at fault, not the real oil pressure.
How much does it cost to fix a P0523?
A new oil pressure sensor costs about $30–$120. Wiring repairs run $50–$200.
Related codes
P0520
P0520 Code: Engine Oil Pressure Sensor/Switch Circuit Malfunction
P0521P0521 Code: Engine Oil Pressure Sensor/Switch Range/Performance
P0522P0522 Code: Engine Oil Pressure Sensor/Switch Circuit Low Voltage
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.