P0520 Technical Description
Engine Oil Pressure Sensor/Switch Circuit Malfunction
In this guide, you’ll learn the meaning, symptoms, causes, and fixes for the P0520 trouble code.
I’ve fixed many cars with this issue, so you’re in good hands.
From understanding the sensor to troubleshooting common causes, we’ll cover everything you need to know.
Let’s get started!
Key Takeaways
- The P0520 trouble code means an issue with the Engine Oil Pressure Sensor/Switch Circuit.
- Symptoms include the Check Engine Light, oil pressure warning light, engine stalling, and inaccurate oil pressure readings.
- Causes range from a faulty oil pressure sensor to damaged wiring or low/dirty oil.
- Start by checking oil levels and condition before inspecting the sensor and wiring.
- Use a multimeter to test the sensor and a mechanical gauge to verify oil pressure.
- Clear the code and test drive the vehicle after making repairs to ensure the issue is resolved.
Table of ContentsShow
What Does P0520 Trouble Code Mean?
The P0520 trouble code indicates a problem with the Engine Oil Pressure Sensor/Switch Circuit. This sensor monitors the oil pressure in your engine.
The Powertrain Control Module (PCM) relies on this sensor to ensure the engine receives proper lubrication. If the PCM detects an irregular reading, it triggers the P0520 code.
When the oil pressure sensor fails or sends inaccurate readings, the PCM can’t accurately determine the oil pressure.
This can lead to various issues, including an illuminated Check Engine Light and an oil pressure warning light on the dashboard.
In some cases, you might notice engine stalling or hesitation, as well as inaccurate oil pressure gauge readings.
The oil pressure sensor’s primary role is to monitor the oil pressure and send this information to the PCM.
Proper oil pressure is crucial for engine health, as it ensures all moving parts are adequately lubricated.
If the oil pressure is too low, it can cause severe engine damage. On the other hand, if the sensor falsely reports low oil pressure, it can lead to unnecessary repairs and panic.
Common causes of the P0520 trouble code include a faulty oil pressure sensor, damaged or corroded wiring, or issues with the oil pressure itself.
Diagnosing the exact cause requires a thorough inspection of the sensor and related components.
In summary, the P0520 code is a warning that your vehicle’s oil pressure monitoring system isn’t functioning correctly.
Addressing this issue promptly is essential to maintain your engine’s health and avoid further complications.
P0520 Trouble Code Symptoms
If your vehicle has triggered the P0520 trouble code, you might notice several symptoms:
- Illuminated Check Engine Light
- Oil pressure warning light on the dashboard
- Engine stalling or hesitation
- Inaccurate oil pressure gauge readings
- Unusual engine noises, such as ticking or knocking
P0520 Trouble Code Causes
Several factors can trigger the P0520 trouble code:
- Faulty oil pressure sensor
- Damaged or corroded wiring or connectors
- Issues with the oil pressure itself
- Low or dirty engine oil
- Faulty PCM (rare)
How To Fix a P0520 Trouble Code
To fix the P0520 trouble code, follow these steps to diagnose and repair the issue:
1. Check the Oil Level and Condition
Ensure the engine oil is at the correct level and in good condition. Low or dirty oil can cause pressure issues. If necessary, top up or change the oil.
2. Inspect the Oil Pressure Sensor
Locate the oil pressure sensor, usually found near the oil filter or on the engine block. Visually inspect it for damage or signs of wear. Replace if necessary.
3. Examine Wiring and Connectors
Check the wiring and connectors leading to the oil pressure sensor. Look for signs of corrosion, damage, or loose connections. Repair or replace any damaged components.
4. Test the Oil Pressure Sensor
Use a multimeter to test the sensor’s electrical resistance. Compare the readings to the manufacturer’s specifications. If the readings are outside the normal range, replace the sensor.
5. Use a Mechanical Oil Pressure Gauge
To verify the actual oil pressure, use a mechanical oil pressure gauge. Connect it to the engine and compare the readings to the specifications in your vehicle’s service manual. If the oil pressure is low, further investigate potential internal engine issues.
6. Scan for Additional Trouble Codes
Use an OBD-II scanner to check for other trouble codes that might indicate related issues. Address any additional codes before concluding the diagnosis.
7. Clear the Code and Test Drive
After making repairs, clear the P0520 code with the OBD-II scanner. Take the vehicle for a test drive to ensure the problem is resolved and the code does not return.
By following these steps, you can accurately diagnose and fix the P0520 trouble code, ensuring your engine remains properly lubricated and operates smoothly.
Conclusion
Now that you know what the P0520 trouble code means and how to fix it, you’re ready to tackle the issue.
Ever had to deal with a stubborn sensor?
Drop a comment below with your experiences or any tips you might have!
