P0523
Engine Oil Pressure Sensor or Switch A High
Same as P0520 with the signal voltage above the plausible range - usually a short to supply or sensor failure that pegs the output high.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: easy
Common causes
Ordered by how often each turns out to be the cause.
- Signal shorted to supplyCommon
Parts involved
- Oil Pressure Sensor A
P0523 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.