P0523

Symptoms

• Check Engine Light Is On
• The oil pressure light on the dashboard may be on.
• Possible abnormally high blood pressure according to the scanner
• Increased engine noise (at real high pressure)
• Oil leaks through seals (at real high pressure)

Causes

• Faulty oil pressure sensor (gives inflated readings)
• Signal wire short circuit to power
• Sensor ground wire break
• Real abnormally high oil pressure
• Clogged oil filter
• Oil pump pressure reducing valve malfunction

How to Fix

1. IMPORTANT: check the actual oil pressure with a mechanical pressure gauge before electrical diagnostics
2. If the actual pressure is normal, diagnose the electrical circuit of the sensor
3. Check the voltage at the sensor connector with a multimeter
4. Check signal wire for short to power
5. Check the sensor ground wire
6. Replace the oil pressure sensor if it is faulty
7. If the actual pressure is high, replace the oil filter, check the pressure relief valve
8. Reset error after repair

Related codes

Error P0523 by Vehicle Brand