![]() Make sure that you verify that you have oil pressure if the oil light is on. If there is low or no oil pressure, you’ll need to figure out why.ĭiagnosing P0520 is straightforward. If the oil pressure from the gauge reads ok, you’ll need to replace the oil pressure sending unit/sensor. Here’s a great YouTube video that will show you exactly how to use this gauge to check. You can use a manual oil pressure gauge to see if it’s where it needs to be. The wiring is close to the Ram’s exhaust and can get brittle over time.Īssuming that the oil level and wiring both look fine, the next thing to do would be to manually check the oil pressure. Wiring issues are one of the more common reasons that this code is thrown. Don’t forget to make sure that the harness is still plugged into the sending unit and undamaged. If it has any damaged wiring, that could be causing P0520. Next, you should inspect the wiring harness running from the oil pressure sensor to the ECM. If the vehicle is past it’s oil change deadline (regardless of how the oil looks), changing the oil would be a good idea. If it appears to be black or grimy, it may be interfering with the oil pressure sensor. If it’s full make sure that it looks healthy. The first thing that you should do is check the oil level. Here are the steps a mechanic would take to manually diagnose P0520 in your Dodge Ram.
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