Powertrain, generic (extended)

P222E Barometric Pressure Sensor B Circuit Intermittent/Erratic

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P222E catches a sensor B signal that jitters. Outside air pressure changes slowly, so GM measures noise directly: every 12.5 ms the difference to the previous reading is taken, and the absolute differences over 80 consecutive readings are added up into a so-called string length. If that total exceeds 100 kPa, the one-second sample counts as failed; four failures in five samples set the code as Type B, MIL after two trips. GM uses this in the 2018 tables for the 3.0 L LGW and in a 2016 engine family. The fault differs from P222C/P222D, where the voltage sits steadily outside its limits, and from P222B, where a smooth signal shows the wrong value. Loose pins, chafed wires and electrical interference are the usual suspects.

Likely causes

Loose or corroded terminal at sensor B or the ECM
Chafed wire with intermittent contact
Electrical interference, for example from a poorly grounded component nearby

Symptoms

  • Check engine light that may come and go
  • Second barometric value jumping on the scan tool

Repair estimate

DifficultyMediumDIY possible
Parts and labour€40–300
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

P222AP222BP222CP222DP2230

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