AutoCodes – Chevrolet – P0521 2015 Chevrolet Silverado

P0521 2015 Chevrolet Silverado Code - Engine Oil Pressure Sensor Performance

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: P0521 2015 Chevrolet Silverado indicates Engine Oil Pressure Sensor Performance.
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 1,504

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 P0521 2015 Chevrolet Silverado 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 measured oil pressure is at least 47 kPa (6.8 psi) less than or 50 kPa (7.3 psi) higher than the predicted oil pressure or the engine oil pressure is outside of a calculated working range determined by engine speed and temperature.

OBDII Code P0521 2015 Chevrolet Silverado - Engine Oil Pressure Sensor Performance - AutoCodes.com — P0521 2015 Chevrolet Silverado Code - Engine Oil Pressure Sensor Performance

What does this mean?

What are the Possible Causes of the DTC P0521 2015 Chevrolet Silverado?

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 P0521 2015 Chevrolet Silverado?

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.

There is a factory service bulletin for the following Chevrolet models:
2010 Chevrolet Camaro SS
2007-2010 Chevrolet Avalanche
2007-2010 Chevrolet Silverado
2007-2010 Chevrolet Suburban
2007-2010 Chevrolet Tahoe
2007-2009 Chevrolet Impala
2005-2009 Chevrolet Trailblazer
2007 Chevrolet Monte Carlo
Chevrolet Factory Service Bulletin OBDII Code P0521

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0521 2015 Chevrolet Silverado 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 P0521 2015 Chevrolet Silverado 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 P0521 2015 Chevrolet Silverado Code

1. What does the OBDII code P0521 mean for a 2015 Chevrolet Silverado?

P0521 indicates an issue with the performance of the engine oil pressure sensor, meaning the sensor's readings are outside the expected range.

2. What are the common symptoms of P0521 in a 2015 Chevrolet Silverado?

Symptoms include the check engine light turning on, erratic or inaccurate oil pressure gauge readings, engine performance issues, and potential low oil pressure warnings.

3. What causes the P0521 code to appear in a 2015 Chevrolet Silverado?

Common causes include a faulty oil pressure sensor, low or degraded engine oil, wiring issues in the sensor circuit, or a failing oil pump.

4. Can I continue driving my Silverado with a P0521 code?

Driving with a P0521 code is not recommended, as it could indicate a serious issue with engine oil pressure, potentially leading to engine damage.

5. How do I diagnose a P0521 code on a 2015 Chevrolet Silverado?

Diagnosis involves checking the engine oil level and condition, inspecting the oil pressure sensor and its wiring, and verifying oil pressure using a mechanical gauge.

6. How do I fix the P0521 code on my 2015 Chevrolet Silverado?

Fixes may include replacing the oil pressure sensor, changing the engine oil and filter, repairing faulty wiring, or addressing oil pump issues if needed.

7. How much does it cost to fix a P0521 code on a 2015 Chevrolet Silverado?

Repair costs can range from $100 to $300 for sensor replacement, with higher costs if additional components like the oil pump need repair or replacement.

8. Can low oil levels trigger the P0521 code in a 2015 Silverado?

Yes, low or dirty oil can cause inaccurate readings from the oil pressure sensor, triggering the P0521 code.

9. How can I prevent the P0521 code from recurring in my 2015 Chevrolet Silverado?

Regular oil changes, using the correct oil type, and routine inspection of the oil pressure sensor and wiring can help prevent this issue.

10. Is replacing the oil pressure sensor a DIY job on a 2015 Chevrolet Silverado?

Replacing the oil pressure sensor can be a DIY job for those with basic mechanical skills, but it may require specific tools and access to the sensor, which is often located near the engine block.