AutoCodes – Generic – P0523

P0523 Code - Engine Oil Pressure Sensor Circuit High Voltage

Quick Answer

The engine oil pressure sensor changes voltage based on the engine oil pressure. Common causes include Low oil level, Faulty Engine Oil Pressure Sensor, Engine Oil Pressure Sensor harness is open or shorted. 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: P0523 indicates Engine Oil Pressure Sensor Circuit High Voltage.
Common causes: Common causes include Low oil level, Faulty Engine Oil Pressure Sensor, Engine Oil Pressure Sensor harness is open or shorted.
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 53,286

How popular is this code, among other codes? Medium

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 Jun 30, 2022

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
Comments
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Code P0523 Description

The engine oil pressure sensor changes voltage based on the engine oil pressure. The engine oil pressure sensor is a 3-wire sensor comprising the signal circuit, the low reference circuit, and the 5 V reference circuit. The Engine Control Module (ECM) supplies 5 V to the engine oil pressure sensor via the 5 V reference circuit and provides ground via the low reference circuit. The ECM monitors the signal circuit of the engine oil pressure sensor to determine if the engine oil pressure sensor voltage is within the normal operating range of approximately 1 - 4 V. When the engine oil pressure is high, the engine oil pressure sensor voltage is high, and the ECM senses a high signal voltage. When the engine oil pressure is low, the engine oil pressure sensor voltage is low, and the ECM senses a low signal voltage. The ECM sends the engine oil pressure information to the instrument cluster via serial data. The instrument cluster will illuminate or display the engine oil pressure indicator when the engine oil pressure is low. The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the engine oil pressure sensor signal circuit is greater than 4.8 V for greater than 10 s.

OBDII Code P0523 - Engine Oil Pressure Sensor Circuit High Voltage - AutoCodes.com — P0523 Code - Engine Oil Pressure Sensor Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0523?

Low oil level
Faulty Engine Oil Pressure Sensor
Engine Oil Pressure Sensor harness is open or shorted
Engine Oil Pressure Sensor circuit poor electrical connection
Engine Mechanical Problem
Faulty Engine Control Module (ECM)

How to Fix the DTC P0523?

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 does this mean?

Code Tech Notes

DTC P0521 can be set if engine oil pressure is outside the calculated engine oil pressure model stored in the engine control module. This can be an indication of mechanical engine issues causing lower than expected engine oil pressure.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0523 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.

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Information for Specific Makes

P0523 Acura — Engine Oil Pressure Sensor/Switch Circuit High Voltage
P0523 Buick — Engine Oil Pressure Sensor Circuit High Voltage
P0523 Cadillac — Engine Oil Pressure Sensor Circuit High Voltage
P0523 Chevrolet — Engine Oil Pressure Sensor Circuit High Voltage
P0523 Chrysler — Engine Oil Pressure Switch Circuit High
P0523 Dodge — Engine Oil Pressure Switch Circuit High
P0523 GMC — Engine Oil Pressure Sensor Circuit High Voltage
P0523 Honda — Engine Oil Pressure Sensor/Switch Circuit High Voltage
P0523 Jeep — Engine Oil Pressure Switch Circuit High
P0523 Mercedes-Benz — Engine Oil Pressure Sensor/Switch Circuit High Voltage
P0523 Pontiac — Engine Oil Pressure Sensor Circuit High Voltage
P0523 RAM — Engine Oil Pressure Switch Circuit High
P0523 Saturn — Engine Oil Pressure Sensor Circuit High Voltage

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.