Powertrain, generic (extended)

P222D Barometric Pressure Sensor B Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P222D is stored when sensor B reports an excessive voltage. GM's 2018 tables for the 3.0 L LGW name contact with a supply voltage or a broken line: on that input a broken wire drives the signal up, not down. The limit is 90 % of the 5 V range, about 115 kPa, met in 320 of 400 readings; Type B, MIL after two trips. GM's 2023-2024 twin-throttle engine evaluates the raw pressure of the sensor ahead of the bank 2 throttle and fails it above 115 kPa held for 2 s. Since an open line lands here, a disconnected connector after repair work is a typical find. P222C covers the low side, P2229 the same fault on sensor A. The engine keeps running on the remaining sensors.

Likely causes

Connector of sensor B unplugged or signal wire broken
Signal wire shorted to 5 V or battery voltage
Sensor B internally defective

Symptoms

  • Check engine light
  • Second barometric reading stuck near the top of its range

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

P222AP222BP222CP222EP2229

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