Powertrain, generic · Vehicle speed, idle control and auxiliary inputs

P0522 Engine Oil Pressure Sensor/Switch A Low

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

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. P0522 means the signal voltage is below its limit: GM 2018 below 5 % of the 5 V reference, Ford petrol 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.

Likely causes

Signal line shorted to ground or open
5 V reference failed or shorted
Sensor faulty internally
Connector corroded or oily

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

Repair estimate

DifficultyEasyDIY possible
Parts and labour€50–250
Time0.3–1.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

oil pressure sensorsensor wiringengine control module

Related codes

P0520P0521P0523P0524

References: gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com, fordservicecontent.com.