Generic fault code

P0523 — Engine oil pressure sensor/switch A: signal high

Q: What usually causes code P0523?

Short circuit to battery or another voltage. The most likely causes come first. Only a check on the car confirms which one is yours.

Q: What are the symptoms of code P0523?

Oil pressure or engine warning light on. Metallic noises from the engine. Odd oil pressure or temperature readings. These are the usual symptoms of this kind of fault: not all of them always appear, and sometimes you notice nothing.

The control unit stores code P0523 when it detects this fault: “Engine oil pressure sensor/switch A: signal high”.

Indicative severity: HighEngine (mechanical, cooling and lubrication)

Updated on October 13, 2026

Reviewed by Daniel Morales, founder of Reprorace SL, on October 13, 2026

What does code P0523 mean?

The engine's mechanics, timing (camshaft and crankshaft), cooling and lubrication. Many of these codes check that the engine is in time and at the right temperature.

System: P · Powertrain
Area: Engine (mechanical, cooling and lubrication) · Car system: Engine and lubrication
Type: Generic (SAE J2012 / ISO 15031-6): the same meaning on every make
Indicative severity: High. Diagnose as soon as possible: it may affect safety or cause damage (engine, catalyst, brakes).

What usually causes code P0523?

Short circuit to battery or another voltage

The most likely causes come first. Only a check on the car confirms which one is yours.

What are the symptoms of code P0523?

Oil pressure or engine warning light on
Metallic noises from the engine
Odd oil pressure or temperature readings

These are the usual symptoms of this kind of fault: not all of them always appear, and sometimes you notice nothing.

Can I keep driving with code P0523?

Better not, except when you really have to. This fault may affect safety or damage the engine, the catalytic converter or the brakes. See a workshop as soon as possible; if you must move the car, drive gently and only short distances. If the light flashes, the car loses power, makes unusual noises or the brakes or steering feel different, stop somewhere safe and call for assistance.

This is guidance only: only someone who checks the car can say whether it is safe to drive.

An indicative description of the code's generic meaning. Each manufacturer may give it a different meaning, conditions or tests: always follow its service information and your workshop's advice.

What you can do yourself

For this kind of fault

If the red oil pressure light comes on, stop as soon as it is safe and switch the engine off. With the engine cold and the car on level ground, check the level with the dipstick or on the dashboard.

Read the code and keep the report: with an ECO-LITE in the OBD socket you see it on your phone or computer, with the data captured when the fault happened.
Look for anything obvious: a loose connector, a disconnected hose, a fuel cap not closed properly or a low fluid level. Do not take apart anything you do not know.
Clear the code only after writing it down or after the repair. Clearing turns the light off, but it also deletes the freeze-frame data and the readiness monitors used at the inspection.
Drive normally for a few days and read the codes again. If the code comes back, the fault is still there: book the workshop and bring the report.

Read your car's fault codes on your phone

With an ECO-LITE in the OBD socket you see the codes in your account, with the data captured when the fault happened, and your workshop can check them remotely, always with your permission.

See the ECO-LITE Reserve (presale)

Related codes

P0199Engine oil temperature sensor A, circuit: intermittent/erratic
P0298Engine oil: over temperature
P0520Engine oil pressure sensor/switch A, circuit: malfunction
P0521Engine oil pressure sensor/switch A: range/performance
P0522Engine oil pressure sensor/switch A: signal low
P0524Engine oil pressure: too low

P05xx codes: vehicle speed, idle control and auxiliary inputs

All fault codes