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Whenever the PCM detects a sensor signal that does not match manufacturer specifications, it logs an error code in your vehicle’s on-board diagnostics (OBD). The first step in diagnosing your vehicle is to connect it to an OBD scan tool to retrieve the specific trouble code and properly identify which sensor circuit is malfunctioning.

One of the OBD codes that you may encounter is the code P0523. This refers to a problem in the operation of your vehicle’s engine oil pressure sensor. Here is some basic information that can help understand what this code means and how it affects your vehicle.

What Does the P0523 Code Mean?

The P0523 code is defined as Engine Oil Pressure Sensor/Switch “A” Circuit High.

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The PCM monitors engine oil pressure with the help of the Engine Oil Pressure sensor. The P0523 code is typically logged when the PCM receives high readings from this sensor. This code belongs to a range of diagnostic trouble codes that refer to oil pressure problems. Related DTCs include P0520, P0521, P0522, and P0524.

car engine control unite ECU with the black electric fuse box on right side
The PCM monitors engine oil pressure with the help of the Engine Oil Pressure sensor.

Aside from the Check Engine Light, the P5023 code may also trigger the low oil warning light on the instrument cluster to be illuminated.

Make sure to read our note about oil pressure for different OEMs before you attempt any DIY diagnosis or fix for code P0523.

Note: The definition of code P0523 may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

 What are the Possible Causes of the P0523 Code?

  • Defective Engine oil pressure sensor
  • Powertrain Control Module (PCM) failure/ PCM software in need of an update
  • Wiring issue
  • High oil pressure (mechanical oil pump fault)
  • High pressure due to obstruction/restriction in oil passage(s)
  • Wrong engine oil used

 What are the Common Symptoms of the P0523 Code?

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How to Diagnose the P0523 Code

Identifying the underlying cause of the P0523 code can be difficult, especially if you’re not confident with your automotive knowledge. In most cases, it would be best to bring your vehicle to an auto repair shop and seek the help of a professional for an accurate diagnosis.

Here are videos that can help give you a better idea of how this trouble code might be diagnosed:

How to Fix the P0523 Code

The P0523 code is a generic trouble code that may apply to various makes and models. While vehicles from different manufacturers may share common symptoms, the steps for diagnosis and repair for a P0523 Chevy code may differ from a P0523 GMC code.

If you’re an advanced DIYer who’d like to fix this code on your own, it will be helpful to refer to your repair manual or get factory vehicle repair information from an online subscription service.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.

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