Powertrain, generic (extended)

P222A Barometric Pressure Sensor B Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P222A is the general circuit code for a second barometric pressure sensor, B. Only some engines carry one. GM's tables for the 3.0 L twin-turbo V6 (LGW, 2018) and for 2023-2024 twin-throttle engines monitor such a sensor B, but they report its circuit faults with the more specific codes P222C (low) and P222D (high) and do not use P222A. No maker documents P222A publicly. Read it as an unspecified electrical fault of sensor B, comparable to P2226 for sensor A, which Ford now stores with a failure-type byte that tells the type of fault. CARB requires circuit monitoring of every input sensor used by an emission-relevant function. Check wiring, connector and the 5 V supply; the engine usually keeps running on sensor A or a model value.

Likely causes

Damaged wiring or corroded connector at sensor B
Barometric pressure sensor B defective
Fault in the shared 5 V sensor supply

Symptoms

  • Check engine light
  • Usually no noticeable change in how the engine runs

Repair estimate

DifficultyMediumDIY possible
Parts and labour€40–350
Time0.5–2 h

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

Parts involved

barometric pressure sensorsensor wiring

Related codes

P222BP222CP222DP222EP2226

References: law.cornell.edu, gsi.ext.gm.com, gsi.ext.gm.com.