Engine Oil Pressure Sensor/Switch Circuit
2001-2001 Cadillac DeVille 4.6L V8 Northstar
The 2001 Cadillac DeVille is equipped with a 4.6L V8 engine. Below you'll find detailed p0520 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
Malfunction in the engine oil pressure sensor circuit.
Symptoms
- Check Engine Light
- Oil pressure warning light on
- Gauge reading incorrect
Common Causes
- Faulty oil pressure sensor/switch
- Wiring damage
- Low oil level
- Low actual oil pressure
Diagnostic Steps
- CHECK OIL LEVEL FIRST
- Test oil pressure with mechanical gauge
- Test sensor resistance
- Inspect wiring
- Check oil pump condition
Repair Notes
ALWAYS verify actual oil pressure with mechanical gauge first. Low oil pressure can destroy an engine.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P0520 on Other Vehicles
Common Questions
What does code P0520 mean on a 2001-2001 Cadillac DeVille?
P0520 stands for "Engine Oil Pressure Sensor/Switch Circuit". Malfunction in the engine oil pressure sensor circuit.
What are the symptoms of P0520 on a Cadillac DeVille?
Common symptoms of P0520 include: Check Engine Light, Oil pressure warning light on, Gauge reading incorrect.
What causes P0520 on a 2001-2001 Cadillac DeVille?
Common causes of P0520 include: Faulty oil pressure sensor/switch, Wiring damage, Low oil level, Low actual oil pressure.
Last updated: March 2026