What P0522 means
The oil pressure sensor matters for emissions control because modern engines use it as an input – for two-stage or regulated oil pumps, hydraulic cam phasers and GM's cylinder deactivation, whose lifters switch by oil pressure.
How the engine computer detects it
P0522 means the signal voltage is below its limit: GM 2018 below 5 % of the 5 V reference, Ford gasoline below 0.25 V, Ford diesel below 0.018 V, about 5 s. As the sensor gives about 0.5 V at zero pressure, this is an electrical fault – real low pressure is P0524. GM's 2006 V8s used the warning lamp only with cylinder deactivation; GM's 4.6 L Northstar then allows cam phasing only above 1500 rpm.
Written from public technical sources and not yet checked by a mechanic. How we write these pages
Symptoms
- Check engine light (depending on the maker)
- Oil pressure gauge at zero or warning despite normal pressure
- Cam phasing or cylinder deactivation possibly disabled
Common causes
- Signal line shorted to ground or open Most likely
- 5 V reference failed or shorted Possible
- Sensor faulty internally Possible
- Connector corroded or oily Possible
How to diagnose P0522
- Read every stored code with an OBD-II scanner. If misfire or fuel trim codes are there too, fix those first: they often cause this one.
- Inspect the parts involved: oil pressure sensor, sensor wiring, engine control module.
- Work through the causes above from most to least likely, cheapest checks first.
- Clear the code and drive a full drive cycle to confirm the repair held.
Reading the code
- P
- Powertrain
- 0
- Generic (SAE) code
- 5
- Vehicle speed, idle control and auxiliary inputs
- 22
- Specific fault
Questions drivers ask
Can I drive with code P0522?
Check the oil level before driving. This code can be a faulty sensor or control circuit, but you can't rule out real low oil pressure from the code alone. If the oil pressure warning light comes on, the engine starts ticking or knocking, or the oil is low, don't drive: have it towed.
Will my car pass an emissions inspection with P0522?
Probably not in states that test vehicles with an OBD-II scan: an emissions-related code that keeps the check engine light on is usually an automatic fail. Rules differ by state and county, so check yours.
Will P0522 clear by itself?
The light can go off after several drive cycles without the fault, but the code returns if the cause is still there. After a repair, the readiness monitors need a full drive cycle before an inspection.
Can I fix P0522 myself?
Often yes, with an OBD-II scanner and basic tools. Difficulty: easy. Start with the cheapest checks before replacing expensive parts.
This page is general information, not a substitute for a professional diagnosis. Repair costs are rough estimates for parts and labor and vary by vehicle and region.