Powertrain, generic (extended)

P2228 Barometric Pressure Sensor A Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2228 sets when the voltage from barometric pressure sensor A stays below the lowest value a real atmosphere could produce. Ford's gasoline summaries (2012 and 2020-2023) use under 2.0 V, which would mean an altitude above 15,000 ft, for 5 s; on these engines the sensor is mounted on the PCM circuit board. Ford's 2023 diesels flag under 0.25 V (about 6 kPa) after 0.5 s. GM's 2018 diesel tables attribute it to a grounded or broken signal line on a pull-down input: below 35.5 % of the 5 V supply (equal to 50 kPa) in 320 of 400 readings, Type B with the MIL after two trips. In Ford's 2024 software the same fault appears as P2226-16. P2229 is the high counterpart. The engine runs on a substitute pressure, so drivers mostly see only the lamp.

Likely causes

Signal wire of an external BARO sensor shorted to ground or open
Defective sensor inside the PCM (Ford, Mazda and others), PCM replacement
Low or missing 5 V reference to the sensor

Symptoms

  • Check engine light
  • Auto start-stop deactivated
  • Scan tool shows an implausibly low barometric pressure

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–900
Time0.5–2.5 h

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

Parts involved

barometric pressure sensorsensor wiring

Related codes

P2226P2227P2229P2230P222C

References: newtonnet.co.uk, fordservicecontent.com, gsi.ext.gm.com.