P0520 on Chevrolet: Causes, Symptoms, Fix Cost

What does P0520 mean on a Chevrolet?

P0520 means the ECU sees an out-of-range or implausible signal on the oil pressure sensor circuit. Usually a failed sensor or wiring fault, but it can also flag genuinely low oil pressure, which is why you can't just clear it and drive.

Chevrolet Silverado 1500

2007-2013

5.3L V8 (LC9/LMG) sensor sits under the intake manifold at the rear of the valley. Covered by GM TSB PIP4653 and a well-known AFM-related failure pattern. Intake removal is required.

What causes P0520 on a Chevrolet?

Beyond the generic causes listed on the main P0520 page, these are the Chevrolet-specific patterns we see most often:

Chevrolet Silverado 1500Cracked ACDelco D1846A sensor body leaking oil into the connector

Chevrolet Silverado 1500AFM lifter pressure spikes accelerating sensor failure

Chevrolet Silverado 1500Signal wire shorted to ground inside the oil-filled connector

How to diagnose P0520 on a Chevrolet with OBD2

Follow these steps to pinpoint the root cause of P0520:

Check oil level on the dipstick (or via the electronic gauge on BMW/Audi) before anything else. If it's low, top up and inspect for leaks.
Connect a mechanical oil pressure gauge at the sensor port. Compare idle and 2500 rpm readings to the service manual spec (typically 25-30 psi hot idle, 55-65 psi at 2500 rpm on most engines).
If real pressure is in spec, unplug the sensor connector and inspect for oil intrusion, green corrosion, or spread pins.
Key on, engine off: back-probe the connector. Confirm 5V reference (variable sensors) or battery voltage (switches), a clean ground, and continuity on the signal wire back to the PCM.
Substitute a known-good sensor, clear the code, and retest under the conditions that set it.
If the code returns with a good sensor and clean wiring, scope the signal for dropouts during a road test.
If actual pressure is low, drop the pan and inspect the pickup screen for sludge before condemning the pump.

How much does P0520 cost to fix on a Chevrolet? (EUR)

Estimated repair costs on a Chevrolet (Chevrolet parts and labour typically run 40% above the average for this code).

Repair	Parts Cost	Labor Cost	Total Estimate	DIY Difficulty
Replace oil pressure sensor/switch	€28–€126	€56–€210	€84–€336	Moderate
Repair damaged connector or pigtail	€14–€84	€84–€252	€98–€336	Moderate
Oil and filter change with correct viscosity	€56–€140	€42–€98	€98–€238	Easy
Replace oil pump and pickup	€210–€630	€560–€1680	€770–€2310	Professional
Engine overhaul or replacement for worn bearings	€2100–€8400	€1400–€4200	€3500–€12600	Professional

Prices estimated as of May 2026. Costs vary by region, vehicle, and shop.

These codes commonly cluster with P0520 on Chevrolet vehicles:

P0521ChevroletP0522P0523P0524

FAQ: P0520 on Chevrolet

Can I just clear P0520 and keep driving?

Only after you've confirmed real oil pressure with a mechanical gauge. Clear it while pressure is actually low and you're rolling the dice on rod bearings.

Why did P0520 come on right after an oil change?

Three usual suspects: wrong viscosity (5W-30 in a spec 0W-20 engine reads odd at cold start), a defective filter with a stuck bypass, or the sensor connector got bumped loose. Recheck the connector first, it's free.

Is a leaking oil pressure sensor the same fault?

Usually yes. The GM 5.3L LC9 sensor is famous for cracking and weeping oil into the connector, which then shorts the signal wire. If yours is wet, replace it whether it's throwing the code yet or not.

How long does the sensor itself take to replace?

15 minutes on a Ford 5.4L switch. Two to three hours on a GM LS truck engine because the intake manifold has to come off. Budget accordingly.

Can a weak battery or bad ground trigger P0520?

Yes. Sub-11V cranking voltage and corroded engine-to-body grounds cause implausible sensor readings across the board. Load-test the battery and clean the grounds before chasing wires.

P0520 on Chevrolet: Causes, Symptoms and Fix Cost