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  • Your vehicle’s powertrain control module (PCM) will log a P0523 code if it detects an unusually high oil pressure reading from the engine oil pressure sensor or switch. This can be caused by a defective sensor, wiring issues, mechanical faults in the oil pump, or restricted oil passages.
  • Other oil pressure-related codes that might register include P0520, P0521, P0522, and P0524.
  • A high oil pressure gauge reading and an illuminated oil pressure warning light are telltale signs of a logged P0523 code.

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.

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What Does the P0523 Code Mean?

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

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.

Buying a Replacement Oil Pressure Sensor for Your Engine to Fix DTC P0523

Depending on the cause, you might have to inspect your vehicle’s oil pressure sensor if your PCM logs DTC P0523. If it’s faulty, don’t put off replacing it to keep it from affecting other parts and logging other trouble codes. The great news is that you can get a replacement that’s built to last at

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All our oil pressure sensors passed the highest quality control standards from industry professionals. Simply use your mobile phone or computer to visit our website. Narrow down the selection to compatible parts with our vehicle selector, then change the filters to find the sensors that match your needs.

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Shop now and take advantage of the best deals on oil pressure sensors.

About The Authors
Written By Automotive and Tech Writers

The Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. Guided by's thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.

Reviewed By Technical Reviewer at

Richard McCuistian has worked for nearly 50 years in the automotive field as a professional technician, an instructor, and a freelance automotive writer for Motor Age, ACtion magazine, Power Stroke Registry, and others. Richard is ASE certified for more than 30 years in 10 categories, including L1 Advanced Engine Performance and Light Vehicle Diesel.

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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