P0523 code — how to fix error fast

No driver likes receiving an error code like the P0523 one after using a scanner tool, so if this happens to you, we understand your concern. It can be a tough road ahead to understanding the P0523 code meaning and why it appears in the first place before you can even get to the fixing part.

So, we realized you may need some help along the way, which is why our team decided to bring you this complete guide on sorting out the problem. We’ll discuss how you can diagnose the issue, figure out what’s causing the trouble, and repair it at its core so you can once again get back on the road safely.

Why you can trust REREV’s OBD2 code advice: Our automotive expert researchers with experienced mechanics undertakes a thorough research methodology to deliver precise insights on OBD codes. Find out more about OBD2 codes research process..

What does the P0523 code mean?

The P0523 code indicates that there is an issue with the engine oil pressure sensor circuit. This sensor is responsible for monitoring the oil pressure in the engine, which is crucial for ensuring that the engine runs smoothly and efficiently.

When the sensor circuit fails, it can lead to incorrect readings of oil pressure, which can cause a range of problems, including engine damage and poor fuel economy. Even if there’s no change in the oil level and flow through the engine, bad readings may be delivered to the engine control module, and that only leads to problems running your car.

What causes the P0523 code?

Knowing why the code appears is the great first step on the road towards finding a solution, but it takes much more than that to completely deal with this issue. A faulty oil pressure reading may be caused by several things, and we wanted to give you a brief overview of each so you can move on with the diagnosis:

Faulty oil pressure sensor

A faulty oil pressure sensor is the most common cause of the P0523 code. The sensor may fail due to wear and tear or exposure to extreme temperatures.

Wiring issues

Wiring issues, such as damaged wires or loose connections, can lead to a loss of signal between the oil pressure sensor and the engine control module (ECM). This loss of signal can trigger the P0523 code.

Issues with the ECM

In some cases, the ECM may be the cause of the P0523 code. The ECM may fail due to electrical issues or damage to the circuit board.

Symptoms that may be present with the P0523 code include oil pressure gauge fluctuations, engine warning light illumination, and engine stalling.

Which car models does the P0523 code affect the most?

The P0523 code can affect a range of different car models. However, it is most commonly found in General Motors (GM) vehicles. This is because GM uses a specific type of oil pressure sensor that is more prone to failure than other types. Here’s our guide on a few of the models that are most likely to be affected by this issue:

• GMC Sierra: This vehicle is plagued by oil pressure sensor failure due to the design of the sensor and its placement within the system which leads to it more frequently failing than other types.
• BMW 335i: The E90 and E92 generation of the BMW 3 Series equipped with a twin-turbo 3.0-liter engine also frequently encounter issues with the engine oil pressure system which leads to the code P0523.
• Chevrolet Silverado: Just like the GMC Sierra, the Silverado also suffers from the oil pressure sensor which is more prone to failure than other types used in similar vehicle models.

How to diagnose the P0523 code

Diagnosing the P0523 code requires a thorough inspection of the car’s oil pressure sensor, wiring, and engine control module (ECM). Here are the main ways you can figure out what’s causing the issue:

Use an OBD2 scanner tool

This is a tool that can read diagnostic trouble codes (DTCs) stored in the car’s ECM. A mechanic can use an OBD-II scanner to retrieve the P0523 code and other related codes.

Checking the oil pressure sensor

The mechanic may test the oil pressure sensor using a multimeter or a special diagnostic tool. This test can help determine if the sensor is faulty or not.

Checking the wiring

The mechanic may check the wiring for continuity and use a circuit tester to check for any open circuits. If there’s a short circuit, the sensor may fail to provide accurate oil pressure readings because of it and in this case, it’s the most common cause of the code P0523.

Testing the ECM

If all other components check out okay, the mechanic may test the ECM to ensure it is functioning properly.

How to fix the P0523 code

Fixing the P0523 code requires addressing the underlying issue that is causing the code to be triggered. So, now that you have a bit more knowledge on what might have caused it, it’s time we get to the fixing part to give you a precise idea of what may solve the issue for your car:

Replacing the oil pressure sensor

If the oil pressure sensor is faulty, it may need to be replaced. The mechanic will remove the old sensor and install a new one.

Repair the damaged wiring or connections

If there are any damaged wires or loose connections, they will need to be repaired or replaced. you can also have an experienced car electrical check the oil pressure sensor circuit so you can fix the connections if there’s a short within the system.

Replace a faulty ECM

In some cases, the ECM may be the cause of the P0523 code. If this is the case, the mechanic may need to repair or replace the ECM.

How to prevent the P0523 code

Preventing the P0523 code involves routine maintenance and proper care of the affected system. Some preventative measures include:

• Regular oil changes
• Checking the oil pressure level
• Inspecting the wiring
• Keeping up with the engine’s maintenance routine

While regular oil changes can help prevent issues with the oil pressure sensor, checking the wiring from time to time after every other oil change can save you the trouble of dealing with this code. Also, it’s crucial to keep track of your engine’s maintenance schedule and use the proper oil type recommended by the manufacturer.

Our take

Overall, the code P0523 seems pretty harmless at first, and you may not even notice any signs of issues with the engine’s operation upon the code’s reading. However, it may only take less than a month to drive with this code until you spot the first signs of the code and its root cause leaving a mark on your engine.

To cut the worries short, it’s best to tackle the code right away and we hope that this guide has provided you with an idea of how to do it.