Dodge Charger P0520: Oil Pressure Switch/Sensor → Circuit


Common OBD2 trouble codes include P0520.  It’s generic, which means that it has the same meaning for the Dodge Charger as it would any other vehicle.  P0520 indicates that the oil pressure sensor is operating outside of its normal “range”.  This is usually caused by either a defective oil pressure sensor switch, or wiring problems.

Your Charger’s oil pressure sensor measures the oil pressure mechanically, and converts that reading into a voltage signal that the ECM (Computer) converts into an oil pressure reading.  This is the signal that triggers your oil warning light and appears on your oil pressure gauge.

Red oil alert lights are a sign of a problem.  It is possible for the oil pressure sensor to be bad.  If there's no oil pressure, then P0520 could occur.

P0520 Dodge Charger


Índice de Contenido
  1. P0520 Quick facts
  2. P0520 Symptoms:  Dodge Charger
  3. P0520 Causes:  Dodge Charger
  4. Charger P0520 Diagnosis
    1. 1. Examine the oil
    2. 2. Examine the Wiring Harness
    3. 3. You can manually check the oil pressure
  5. Conclusion:  P0520 Dodge Charger

P0520 Quick facts

  • Oil pressure sensors are the most frequent cause.
  • You can also get it from low oil pressure.
  • If you hear knocking or have the low oil pressure light, don’t drive until P0520 is diagnosed.
  • Similar to P0521.


P0520 Symptoms:  Dodge Charger

There may not be any symptoms other than the check engine lamp.  The oil pressure may be low if the engine is making unusual noises (clacky or metallic), 

Dodge Charger P0520 Diagnosis

P0520 Causes:  Dodge Charger

  • Oil Pressure Sensor It is possible that P0520 was caused by an oil pressure sensor. However, it would be wise to inspect the oil quality and level first.
  • Oil Pressure Sensor Wiring - The signal from the oil pressure sensor is P0520. This indicates that there has been a malfunction in the circuit.  This may indicate an issue with wiring.
  • You can have low or no oil The first thing that you should do is check to see if there is oil in your vehicle’s engine at all.  The crankcase can give P0520 if the oil level is very low.  This can be fixed by filling the oil with more, clearing the code and resetting the crankcase.  
  • Low Oil Pressure The code will appear if oil pressure drops too low.  This code should be visible with an oil light or low readings from the oil pressure gauge. 
  • Wrong oil or dirt? If your Charger’s oil hasn’t been changed for a long enough period of time, it can interfere with the oil pressure sensor, even if there still is oil pressure.


Charger P0520 Diagnosis

These are the steps that a mechanic will take to diagnose your Dodge Charger's P0520.  


1. Examine the oil

First, check your oil level.  If it’s full make sure that it looks healthy.  It may have a problem with the oil pressure sensor if it is darkened or stained.  If the vehicle is past it’s oil change deadline (regardless of how the oil looks), changing the oil would be a good idea.


2. Examine the Wiring Harness

Next, you should inspect the wiring harness running from the oil pressure sensor to the ECM.  It could also be the cause of P0520.  Don’t forget to make sure that the harness is still plugged into the sending unit and undamaged.  

This code can be thrown for many reasons, including wiring issues.  The wiring is close to the Charger’s exhaust and can get brittle over time.


3. You can manually check the oil pressure

After confirming that both the oil level, and the wiring are fine, it is time to check the oil pressure manually.  There are two options: Oil pressure can be manually adjusted gauge to see if it’s where it needs to be.  These are simple to use.  Here’s a Great YouTube Video This will demonstrate how you can use the gauge to test.

If the oil pressure from the gauge reads ok, you’ll need to replace the oil pressure sending unit/sensor.  If there is low or no oil pressure, you’ll need to figure out why.


Conclusion:  P0520 Dodge Charger

The process of diagnosing P0520 can be done easily.  Check that the oil light on your Charger is lit.  You will be successful in fixing your Charger.


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