P0523 on 2003-2010 Chevrolet Silverado 1500 — Engine Oil Pressure Sensor/Switch High Voltage
1 vehicles · 1 makes · $20-$120 repair
How to diagnose and fix P0523: most-reported vehicles
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Chevrolet Silverado 1500 · 2003–2010
The engine oil pressure sensor/sending unit on LS truck V8s commonly fails or gets its screen clogged with sludge, sending the dash gauge bouncing, pegging high, dropping to zero, or reading falsely low—often with an 'oil pressure' warning even though actual pressure is fine.
Common Symptoms
- Oil pressure gauge erratic or bouncing
- Gauge pegged high or dropped to zero
- Low-oil-pressure warning with normal engine sound
How to Fix
Verify real oil pressure with a mechanical gauge first. If the gauge itself doesn't respond when the sensor is unplugged, the instrument-cluster stepper motor is the culprit instead. Don't replace the oil pump on a bad-reading gauge alone.
Sources for this issue (3)
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P0523 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0523 mean?
P0523 stands for "Engine Oil Pressure Sensor/Switch High Voltage." The PCM detects a voltage on the oil pressure sensor circuit that is too high (often an open circuit or short to voltage). The high signal indicates an electrical fault in the sensor circuit.
What are the most common causes of P0523?
The most common causes of P0523 are: Open circuit in sensor wiring, Short to voltage, Failed oil pressure sensor, Corroded/loose connector, Faulty PCM input. The specific cause varies by vehicle.
How much does it cost to fix P0523?
Repair costs for P0523 range from $20 to $120, depending on the vehicle and root cause.
Which vehicles are affected by P0523?
Au7o has documented P0523 across 1 vehicle models from 1 manufacturers: Chevrolet.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.