P0520 Code: Dodge Ram 1500 (2019-2024) - Causes, Symptoms & Fixes

No recalls found in NHTSA database.

No NHTSA complaints are listed for this exact make/model/year/issue combination in the provided data.

Below is a comprehensive diagnostic guide for P0520 on 2019–2024 Dodge Ram 1500. It combines the standard interpretation of P0520 with RAM-specific considerations, plus practical steps, costs, and prevention tips. Data limitations: the guidance reflects general automotive knowledge and the provided data (no recalls, no complaints) and may not capture all real-world possibilities.

1. CODE MEANING AND SEVERITY

• Code meaning: P0520 = Engine Oil Pressure Sensor/Switch Circuit Malfunction. The PCM detects a fault in the oil pressure sensor circuit (sensor, wiring, or related circuitry) rather than explicitly confirming actual oil pressure.
• How it can present:
  • The oil pressure warning light (or gauge) may illuminate.
  • The Check Engine Light (MIL) may come on with P0520.
  • Possible alternation with related codes such as P0521 (Oil Pressure Sensor Range/Performance), P0522 (Low Input), or P0523 (High Input).
• Severity:
  • Sensor/wiring fault: Typically moderate severity. If the sensor is faulty but oil pressure is actually ok, you may still see a warning.
  • Actual low oil pressure: High severity. Prolonged low oil pressure can cause severe engine damage (bearing wear, etc.). If low pressure is confirmed, stop driving and diagnose urgently.
• Data limitations note: The summarized data show no documented recalls or owner complaints for this exact code on this model/year in the provided dataset. This guide relies on general OBD-II knowledge and RAM-specific considerations rather than a claims-based database result.

2. COMMON CAUSES ON DODGE RAM 1500

• Faulty oil pressure sensor or sensor connector, or a damaged sensor sealing o-ring.
• Damaged or corroded wiring harness to the sensor; loose/poor ground.
• Oil level too low or oil that is degraded/too viscous for the engine’s needs.
• Worn or failing oil pump (internal wear, timing chain-driven pump issues, or suction problems).
• Clogged oil passages, sludge buildup, or a blocked oil filter causing reduced flow.
• Faulty oil pressure relief valve or regulator within the pump assembly.
• Wiring harness chafing, loose pins, or moisture intrusion in the engine bay.
• Recent oil change with incorrect viscosity or poor filter causing circuit interaction (less common but possible).

3. SYMPTOMS

• Illumination of the Check Engine Light and/or oil pressure warning light.
• Gauge behavior: oil pressure gauge may read low, erratic, or momentarily spike.
• Engine noise or ticking if actual oil pressure is low.
• Dull engine performance or reduced power only if oil pressure is genuinely compromised.
• Oil spots/leaks around the sensor area or under the vehicle (possible if the sensor or its gasket is failing).
• Inconsistent or intermittent readings if the sensor or wiring is intermittently making contact.
• No symptoms other than a stored P0520 unless the circuit is actually failing.

4. DIAGNOSTIC STEPS
   Before you start: Ensure the vehicle is on a level surface, key off, and engine at a safe temperature. Have a basic hand tools kit and a mechanical oil pressure gauge ready (optional but recommended for confirmation).

Step 1 – Verify codes and data

• Scan the PCM for P0520 and any related codes (P0521–P0523). Note freeze-frame data (engine rpm, oil temperature, road load, etc.).
• Clear the codes after basic checks if you suspect a false reading, then drive to see if the code returns. Do not clear if you suspect actual low oil pressure.

Step 2 – Check oil level, quality, and conditions

• With engine at operating temperature, check the oil level on dipstick. Top up if low (use the correct grade as per owner’s manual).
• Inspect oil condition (milky? very dark, burnt smell? contaminants?).
• If oil level is consistently low, search for external leaks (oil pan, sensor area, valve covers) and investigate consumption causes.

Step 3 – Inspect the oil pressure sensor and wiring

• Locate the oil pressure sensor (usually near the engine block or oil filter housing). Visually inspect for cracks, damage, oil seepage, or corrosion on the connector.
• Check wiring harness for abrasion, pin damage, loose connector, or moisture intrusion. Reseat the connector firmly.
• Inspect ground strap and main engine ground connection to the sensor’s circuit.

Step 4 – Compare sensor reading to actual oil pressure

• Use a scan tool to read live oil pressure data in relation to engine RPM. Note both at idle and under load.
• If the sensor shows abnormal pressure (e.g., 0 psi or wildly fluctuating readings) but you suspect it could be sensor/ground, you’ll want to verify with a mechanical gauge.

Step 5 – Mechanical oil pressure test (recommended for confirmation)

• If available, install a mechanical oil pressure gauge at the oil pressure test port to verify actual pressure. Compare this reading to the sensor’s reading.
• If mechanical gauge reads within spec but the sensor reads low/high, the issue is likely the sensor/wiring. Replace sensor and re-test.
• If mechanical gauge confirms low oil pressure, proceed to deeper investigations (pump, bearings, galleries, oil passages).

Step 6 – Inspect common mechanical causes if oil pressure is truly low

• Check oil pump operation (pump failure, timing relation, worn gears).
• Inspect for clogged oil passages or sludge buildup.
• Inspect oil pressure relief valve for sticking or improper spring force.
• Inspect oil filter for restriction or improper installation.

Step 7 – Fixes based on findings

• Sensor/wiring fault: Replace oil pressure sensor; repair/replace wiring harness as needed; reconnect and clear codes; test drive.
• Sensor ok but wiring issues: Repair wiring or connector; ensure proper grounding; re-test.
• Actual low pressure: Address root cause (oil pump, bearings, oil passages, oil type/viscosity). If damage is extensive, plan for a more extensive repair (engine work).

Step 8 – Post-repair validation

• Clear the codes and run the engine through a basic test drive (both idle and higher RPM) while monitoring live oil pressure data.
• Recheck for any oil leaks around the sensor or removed components.
• If the code returns, repeat diagnostic steps and consider professional diagnosis as needed.

5. RELATED CODES

• P0521: Oil Pressure Sensor Range/Performance (signal outside expected range)
• P0522: Oil Pressure Sensor Circuit Low Input
• P0523: Oil Pressure Sensor Circuit High Input
  Note: P0520 may appear alone or with one of these related codes. Investigate all related data and sensor readings when diagnosing.

6. REPAIR OPTIONS AND COSTS (2025 PRICES)
   Prices are approximate ranges for parts and labor as of 2025 US market. Actual prices vary by region, shop, engine model, and whether you perform DIY work.

• Oil pressure sensor (brand new, OEM or aftermarket)

  • Parts: $15–$70
  • Labor: 0.5–1.0 hour
  • Typical total: $100–$180

• Sensor harness repair or connector replacement

  • Parts: $5–$40 (connectors, sleeves)
  • Labor: 0.5–1.5 hours if simple, up to 2–3 hours if harness replacement
  • Typical total: $80–$250

• Oil change (if recommended as part of the repair, or to address oil condition)

  • Parts: $20–$60 (oil + filter; depending on synthetic or conventional)
  • Labor: $40–$100
  • Typical total: $60–$160

• Oil pump replacement (if actual low pressure due to pump failure)

  • Parts: $100–$400
  • Labor: 4–12 hours (varies by engine variant and access)
  • Typical total: $700–$2500

• Oil passages cleaning or sludge treatment (if blockage is found)

  • Parts: minimal, mainly labor
  • Labor: 2–6 hours
  • Typical total: $300–$900

• Full engine repair or rebuild (rare for P0520 unless severe bearing damage is found)

  • Costs: well over $2,000 and can exceed $5,000–$10,000 depending on scope

Notes:

• The above ranges assume typical Ram 1500 engines (e.g., 3.6L V6, 5.7L Hemi, and 3.0L EcoDiesel variants). Prices can vary by engine and model year due to access and parts availability.
• If the diagnosis reveals a failed engine component beyond the sensor (pump, bearings, or internal damage), the overall repair cost will be higher and may require additional services.

7. DIY VS PROFESSIONAL

• DIY (likely suitable for many Ramsey 1500 owners):
  • Pros: Lower parts cost; educational; sensor replacement is a common DIY job; quick fix if sensor is the root cause.
  • Cons: Access can be tight depending on engine variant; risk of damaging wiring or misdiagnosis; improper oil pressure testing can lead to misinterpretation; requires basic tools and, ideally, a mechanical oil pressure gauge for confirmation.
    Steps for DIY oil pressure sensor replacement (general):
  • Disconnect battery.
  • Locate and disconnect sensor electrical connector.
  • Remove old sensor with a suitable wrench; be prepared for minor oil leakage.
  • Install new sensor with appropriate seal/gasket; torque to spec (if applicable).
  • Reconnect wiring; clear codes; start engine and monitor readings.
  • If the issue persists, revisit diagnostic steps or seek professional help.
• PROFESSIONAL:
  • Recommended if you suspect actual low oil pressure, if the sensor is not easily accessible, or if you do not have the tools to perform a mechanical oil pressure test.
  • A pro can perform a pressure test with a mechanical gauge, verify sensor readings, and diagnose potential internal engine issues safely.
• In all cases, if you suspect low oil pressure, avoid prolonged driving and address it promptly to prevent engine damage.

8. PREVENTION

• Follow the manufacturer-recommended OCI (oil change interval) and use the correct grade and spec of oil for your RAM variant (3.6L, 5.7L, 3.0L EcoDiesel, etc.).
• Use high-quality oil and a compatible oil filter; avoid using incorrect viscosity unless advised by RAM.
• Regularly check the oil level and inspect for leaks around the sensor, oil filter, and oil pan.
• Inspect the oil pressure sensor and its wiring at routine service intervals; replace the sensor if there are signs of wear or corrosion.
• If towing or operating under heavy load, monitor oil pressure readings and consider more frequent oil changes or a higher-grade oil if recommended for your use case.
• Keep electrical connections clean and dry; protect wiring from heat sources and road debris.
• If you notice warning lights or fluctuating gauges, diagnose promptly to prevent potential engine damage.

Final notes

• This guide uses general automotive knowledge tailored to the 2019–2024 Dodge Ram 1500 and the P0520 code, constrained by the supplied NHTSA data (no recalls, no complaints for this combination).
• If you’re unsure about any step, especially when verifying actual oil pressure, consult a qualified technician. Correct diagnosis is essential to avoid unnecessary parts replacement or potential engine damage.