P0520 Code on Dodge Ram 1500: Engine Oil Pressure Sensor/Switch Circuit Malfunction

Dodge Ram 1500 P0520 Oil Pressure Sensor Diagnosis

Quick Answer: What is P0520?

On a Dodge Ram 1500 (especially the 3.6L Pentastar V6 engine), the P0520 code means the computer is receiving an erratic or out-of-range voltage signal from the engine oil pressure sensor. While this sounds catastrophic, in 90% of these trucks, the engine has perfect oil pressure, but the sensor itself has internally failed. Replacing the oil pressure sensor fixes the issue.

Severity: HIGH (Proceed with caution). While this is usually just a faulty sensor, you must NEVER ignore an oil pressure warning. If the engine actually has low oil pressure, driving it even a few miles will destroy the engine completely. Always check your physical oil level first.

1. Common Symptoms in a Dodge Ram 1500

The symptoms of a P0520 are very obvious on your dashboard:

Crazy Oil Pressure Gauge: The needle on your oil pressure gauge may peg all the way to maximum (99 PSI) or drop entirely to zero while driving.
Check Engine Light: Illuminates solidly on the dashboard.
Warning Chime: You may hear a continuous "dinging" sound accompanied by a "Low Oil Pressure" warning message on the screen.
Normal Engine Sound: Despite the scary warnings, the engine sounds completely normal (no loud ticking, knocking, or metal-on-metal sounds).

2. Most Likely Causes (Ranked by Probability)

The Chrysler/Dodge 3.6L engine has a notorious design flaw regarding this specific sensor:

Failed Oil Pressure Sensor (90% of cases): The sensor sits in the valley of the engine block. Heat cycles and vibration eventually destroy its internal electronics, causing it to short out.
Wiring Harness Issue (5% of cases): Rodents chewing on the wires leading to the sensor, or a melted connector.
Wrong Oil Filter / Sludge (4% of cases): Using a cheap, collapsed aftermarket oil filter, or severe engine sludge blocking oil flow to the sensor.
Failing Oil Pump (1% of cases): Extremely rare on the 3.6L, but an actual mechanical failure of the oil pump would trigger this alongside terrifying engine noises.

3. Step-by-Step Diagnostic and Fix

Step A: The "Listen and Dipstick" Test

Before panicking, pull over safely. Turn off the truck, wait 5 minutes, and check the oil dipstick. Is it full? Next, start the truck and open the hood. Listen closely to the engine. If the oil pump had truly failed, the engine would sound like a bucket of bolts rattling around (severe lifter tick). If it sounds smooth and quiet but the gauge says "0 PSI," you have a bad sensor, not a bad engine.

Step B: Replacing the Sensor (3.6L Pentastar V6)

Unfortunately, Dodge placed this $30 sensor in a terrible location. It is located under the lower intake manifold, right next to the oil cooler housing. You must remove the upper and lower intake manifolds to reach it.

While this sounds intimidating, it is just a matter of unbolting plastics. Many DIYers do this in their driveway in about 2 to 3 hours. Always buy a genuine Mopar OEM Oil Pressure Sensor, as cheap aftermarket sensors fail again within months.

4. Estimated Repair Costs

Because of the labor involved in removing the intake manifold, shops charge a heavy premium for this repair. Doing it yourself saves hundreds:

Repair Type	Estimated Cost (USD)
Oil Level Top-Off & Filter Change	$40 - $70
Replace Oil Pressure Sensor (DIY - OEM Part)	$30 - $50 (Parts only)
Intake Manifold Gasket Set (Needed for DIY)	$20 - $35
Replace Oil Pressure Sensor (Mechanic/Dealer)	$350 - $550+