AutoCodes – Buick – P0520 Buick

P0520 Buick Code - Engine Oil Pressure Switch Circuit

Quick Answer

The Powertrain Control Module (PCM) monitors the signal circuit of the Engine Oil Pressure (EOP) sensor. Common causes include Faulty Engine Oil Pressure (EOP) Switch, Engine Oil Pressure Switch harness is open or shorted, Engine Oil Pressure Switch circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0520 Buick indicates Engine Oil Pressure Switch Circuit.
Common causes: Common causes include Faulty Engine Oil Pressure (EOP) Switch, Engine Oil Pressure Switch harness is open or shorted, Engine Oil Pressure Switch circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 357

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Oct 30, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0520 Buick Description

The Powertrain Control Module (PCM) monitors the signal circuit of the Engine Oil Pressure (EOP) sensor. When the oil pressure is high, the sensor is open, and the PCM senses a high signal voltage. When the oil pressure is low, the sensor is closed, and the PCM senses a low signal voltage. The Diagnostic Trouble Code (DTC) will be set when the PCM detects that the EOP sensor signal circuit is pulled low.

OBDII Code P0520 Buick - Engine Oil Pressure Switch Circuit - AutoCodes.com — P0520 Buick Code - Engine Oil Pressure Switch Circuit

What does this mean?

What are the Possible Causes of the DTC P0520 Buick?

Faulty Engine Oil Pressure (EOP) Switch
Engine Oil Pressure Switch harness is open or shorted
Engine Oil Pressure Switch circuit poor electrical connection
Faulty Powertrain Control Module (PCM)
Faulty Instrument Panel Cluster (IPC)

How to Fix the DTC P0520 Buick?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0520 Buick code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0520 Buick code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.