P0520 on Cadillac
Engine Oil Pressure Sensor/Switch Circuit Malfunction
P0520 on Cadillac vehicles indicates engine oil pressure sensor/switch circuit malfunction. Au7o has documented this code across 2 Cadillac models — most commonly on CT5, Escalade. This code indicates a general electrical fault in the circuit for the engine oil pressure sensor or switch. The computer monitors this circuit to know your oil pressure, and it has detected a signal that is missing, shorted, or otherwise out of the expected electrical range. This is typically a wiring or sensor problem rather than an actual loss of oil pressure, but because oil pressure is critical to engine life, it should never be ignored until confirmed. If oil pressure truly is low, serious engine damage can result.
Common Causes of P0520
- •Faulty oil pressure sensor or switch
- •Damaged, corroded, or loose wiring/connector at the sensor
- •Open or short in the sensor circuit wiring
- •Poor ground connection
- •Low engine oil level or genuinely low oil pressure
- •Failed PCM/ECM (less common)
P0520 on Cadillac by Model
Cadillac CT5(1 issue)
- GM 6.2L V8 Engine Recall for Connecting Rod Bearing Failure2021-2024
After widespread engine failures and an NHTSA investigation, GM recalled all 2021-2024 vehicles equipped with the 6.2L V8 engine including the CT5-V. The recall addresses potential connecting rod bearing failure that can cause engine seizure, stalling, or fire risk. The recall covers both naturally aspirated L87 and supercharged LT4 variants.
Cadillac Escalade(1 issue)
- L87 6.2L Connecting Rod Bearing Failure on T1XX Escalade2021-2024
The T1XX Escalade's 6.2L L87 V8 has a documented connecting-rod bearing failure that is separate from the older AFM lifter problem and separate from oil consumption. Manufacturing debris left in the crankshaft oil passages and rod-bearing dimensional variation on engines built in a specific window let the bearings wear through the overlay and into the copper, which then knocks and can seize the engine outright. The failure is often abrupt: owners report a knock, an oil pressure warning, or a complete no-start seizure with very little warning and sometimes under 30,000 miles. The complaint concentration is striking - CarComplaints shows 34 of the 61 total complaints on the 2023 Escalade filed under engine problems, and the 2021 Escalade carries engine as its largest NHTSA complaint category with multiple open defect investigations and recalls. GM has addressed affected VINs through a field action that both inspects/replaces engines and, for engines passing inspection, changes the required oil viscosity and shortens the service interval.
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View P0520 across all makes →Frequently Asked Questions
What does P0520 mean on Cadillac?▼
P0520 stands for "Engine Oil Pressure Sensor/Switch Circuit Malfunction." This code indicates a general electrical fault in the circuit for the engine oil pressure sensor or switch. The computer monitors this circuit to know your oil pressure, and it has detected a signal that is missing, shorted, or otherwise out of the expected electrical range. This is typically a wiring or sensor problem rather than an actual loss of oil pressure, but because oil pressure is critical to engine life, it should never be ignored until confirmed. If oil pressure truly is low, serious engine damage can result. On Cadillac specifically, this code is documented across 2 models.
What causes P0520 on Cadillac vehicles?▼
Common causes on Cadillac: Faulty oil pressure sensor or switch, Damaged, corroded, or loose wiring/connector at the sensor, Open or short in the sensor circuit wiring, Poor ground connection, Low engine oil level or genuinely low oil pressure. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0520 on a Cadillac?▼
Repair costs vary widely depending on the root cause and specific Cadillac model.
Which Cadillac models have P0520 documented?▼
Au7o has documented P0520 on 2 Cadillac models: CT5, Escalade.