P0521 Fault Code

Engine Oil Pressure Sensor/Switch Range/Performance

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0521 fault code indicates that the engine control module (ECM) has detected a problem with the engine oil pressure sensor or switch. This code specifically refers to issues with the range or performance of the oil pressure readings. A malfunctioning sensor can lead to incorrect oil pressure readings, which is crucial for engine lubrication and overall performance.

What are the symptoms of the P0521 code?

Symptoms that may accompany the P0521 fault code include:

• Check Engine Light illuminated
• Erratic or unstable oil pressure gauge readings
• Engine knocking or noise due to inadequate lubrication
• Decreased engine performance or efficiency
• Oil pressure warning light may become illuminated on the dashboard

What causes the P0521 code?

Common causes of the P0521 code include:

• Faulty engine oil pressure sensor or switch
• Wiring issues such as shorts or corrosion in electrical connectors
• Low engine oil levels or poor oil quality
• Malfunctioning oil pump
• ECM or PCM software issues

How to fix P0521?

To resolve the P0521 fault code, consider the following steps:

• Inspect and, if necessary, replace the engine oil pressure sensor or switch.
• Check wiring and connectors for damage, shorts, or corrosion and repair as needed.
• Ensure that the engine has the correct oil level and quality; change the oil if required.
• Test the oil pump to ensure it is functioning properly.
• If all else fails, update or reprogram the ECM with the latest software.