AutoCodes – GMC – P0523 2015 GMC Sierra

P0523 2015 GMC Sierra 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 2015 GMC Sierra 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 325

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 Jun 30, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0523 2015 GMC Sierra 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 2015 GMC Sierra - Engine Oil Pressure Sensor Circuit High Voltage - AutoCodes.com — P0523 2015 GMC Sierra Code - Engine Oil Pressure Sensor Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0523 2015 GMC Sierra?

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 2015 GMC Sierra?

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0523 2015 GMC Sierra 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 P0523 2015 GMC Sierra code?

Need more information on how to fix the P0523 2015 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the 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.

Frequently Asked Questions about P0523 2015 GMC Sierra Code

1. What does OBD-II code P0523 mean for a 2015 GMC Sierra?

Code P0523 indicates high voltage in the engine oil pressure sensor circuit, suggesting a potential issue with the sensor or wiring.

2. What are the common symptoms of code P0523 in a GMC Sierra?

Symptoms may include the check engine light turning on, inaccurate oil pressure readings, engine warning messages, and, in some cases, reduced engine performance.

3. What causes the P0523 code in a 2015 GMC Sierra?

Common causes include a faulty engine oil pressure sensor, damaged wiring or connectors, or an issue with the powertrain control module (PCM).

4. Can driving with code P0523 damage my GMC Sierra's engine?

Yes, if the engine oil pressure is genuinely low and misreported, it can lead to severe engine damage. Itâ€™s important to address this code promptly.

5. How do I diagnose the P0523 code in my GMC Sierra?

Diagnosis typically involves inspecting the engine oil pressure sensor, checking the wiring and connectors, and verifying oil pressure readings with a mechanical gauge.

6. What tools are needed to fix the P0523 code on a GMC Sierra?

Youâ€™ll need an OBD-II scanner, a multimeter to test wiring, and possibly a mechanical oil pressure gauge to verify actual pressure readings.

7. How much does it cost to repair code P0523 on a GMC Sierra?

Repair costs vary, but replacing the engine oil pressure sensor typically costs $50-$150 in parts, plus labor charges if done by a professional.

8. Can low engine oil cause the P0523 code on a 2015 GMC Sierra?

Low oil levels can indirectly trigger the code by affecting the sensor's readings; however, the code specifically relates to high voltage in the circuit.

9. How do I reset the P0523 code on my GMC Sierra after repairs?

After addressing the issue, use an OBD-II scanner to clear the code. If the problem persists, the code will reappear.

10. Is replacing the engine oil pressure sensor the only solution for code P0523?

No, while replacing the sensor is common, you may also need to repair or replace damaged wiring, connectors, or the PCM if they are contributing to the issue.