P0523

Engine Oil Pressure Sensor/Switch A High

Q: Is it safe to drive with P0523?

The code itself is an electrical fault, not low oil pressure, so the engine usually runs fine. But because the gauge can't be trusted, confirm real oil pressure with a mechanical gauge before driving much.

Q: Can I just clear P0523?

It returns until the sensor or wiring is repaired. First verify actual oil pressure is normal, then fix the circuit.

Engine oil pressure sensor Generic OBD-II High

What it means

P0523 means the ECM sees an abnormally high voltage from the engine oil pressure sensor/switch circuit. This is an electrical fault in the sensor circuit — it does not by itself mean oil pressure is actually low. The catch is that a faulty sensor makes the oil-pressure gauge or warning unreliable, so it's worth confirming real oil pressure with a mechanical gauge before dismissing it.

High

Can I keep driving? The engine runs — this is a sensor circuit fault, not proof of low oil pressure. The risk is that you can't trust the oil-pressure gauge/light, so a real pressure problem could go unnoticed. Verify actual pressure and fix promptly.

Real-world scan data

Seen in

246

scans in the past year

Found in

<0.1%

of scans

0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Inaccurate, pegged-high, or erratic oil-pressure gauge reading
Oil-pressure warning light may behave incorrectly
Often no change in how the engine runs

Common causes

Most likely first

Faulty engine oil pressure sensor/switchLikely
Open circuit or short-to-power in the sensor wiring (high voltage)Common
Corroded or loose sensor connectorCommon
Damaged sensor wiring near the engineLess often
ECM/PCM fault (rare)Less often

How to diagnose & fix

Work through it in order

Read freeze-frame data and confirm the code with a scan tool.
Confirm actual oil pressure with a mechanical gauge before assuming the sensor is at fault.
Inspect the sensor connector and wiring for an open or short to power.
Compare the sensor's signal against the expected range for the measured pressure.
Replace the oil pressure sensor if the wiring is good. Clear and re-test.

FAQ

Quick answers

Is it safe to drive with P0523?+

The code itself is an electrical fault, not low oil pressure, so the engine usually runs fine. But because the gauge can't be trusted, confirm real oil pressure with a mechanical gauge before driving much.

Can I just clear P0523?+

It returns until the sensor or wiring is repaired. First verify actual oil pressure is normal, then fix the circuit.

Read & clear P0523 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX