P0523 Code: Engine Oil Pressure Sensor/Switch “A” Circuit High

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.

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.

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?

• Check engine light is on
• Oil pressure gauge reading high
• Oil pressure warning light is illuminated

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 CarParts.com.

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.