AutoCodes – Pontiac – P0521 Pontiac

P0521 Pontiac 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 Pontiac 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 17,230

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 Pontiac 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 Pontiac - Engine Oil Pressure Sensor Performance - AutoCodes.com — P0521 Pontiac Code - Engine Oil Pressure Sensor Performance

What does this mean?

What are the Possible Causes of the DTC P0521 Pontiac?

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 Pontiac?

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 Pontiac models:
2007-2008 Pontiac Grand Prix
2008-2009 Pontiac G8
Pontiac Factory Service Bulletin OBDII Code P0521

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0521 Pontiac 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 Pontiac code?

Need more information on how to fix the P0521 Pontiac code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0521 Pontiac code diagnosed by a professional: Find a repair shop in your area

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 Pontiac Code

1. What are the common symptoms of OBDII code P0521 in a Pontiac?

Low oil pressure warning light, engine oil pressure gauge reading zero, engine knocking noise.

2. What could cause the OBDII code P0521 in a Pontiac?

Faulty engine oil pressure sensor, low engine oil level, clogged oil filter, engine oil pump failure.

3. How can I diagnose the cause of OBDII code P0521 in my Pontiac?

Use a diagnostic scanner to retrieve the code and check the engine oil level, inspect the oil pressure sensor and wiring, test the oil pressure with a gauge.

4. Is it safe to continue driving with OBDII code P0521 in my Pontiac?

It is not recommended to drive with low engine oil pressure as it can cause serious engine damage. Have the issue diagnosed and repaired as soon as possible.

5. What is the typical repair for OBDII code P0521 in a Pontiac?

Replacing the engine oil pressure sensor, checking and correcting the engine oil level, inspecting and possibly replacing the oil filter, testing and replacing the oil pump if necessary.

6. Can a DIY enthusiast fix OBDII code P0521 in a Pontiac?

If you have experience working on vehicles and access to the necessary tools, you may be able to replace the engine oil pressure sensor yourself. However, diagnosing and repairing other potential causes may require professional assistance.

7. How much does it cost to repair OBDII code P0521 in a Pontiac?

The cost of repairing OBDII code P0521 can vary depending on the cause of the issue, the labor rates in your area, and the price of parts. Expect to pay anywhere from $100 to $500 for repairs.

8. Are there any preventative maintenance tips to avoid OBDII code P0521 in a Pontiac?

Regularly check and maintain your engine oil level, follow the manufacturer's recommended oil change intervals, and address any oil pressure warning signs promptly to prevent OBDII code P0521.

9. Can a bad engine oil pressure sensor cause other issues in a Pontiac?

Yes, a faulty engine oil pressure sensor can lead to inaccurate oil pressure readings, potential engine damage from low oil pressure, and trigger the check engine light, affecting overall engine performance.

10. How long does it take to repair OBDII code P0521 in a Pontiac?

The repair time for OBDII code P0521 can vary depending on the specific cause of the issue and the availability of parts. In general, it may take anywhere from 1 to 3 hours to diagnose and repair the problem.