Fault Family System: Powertrain (P-Codes) 15 SAE Codes

Baro Pressure Sensor Circuit

Diagnostic & Technical Explanation

P2226 (Barometric Pressure Sensor A Circuit) points to the barometric pressure sensor (position A, B, or C on engines carrying more than one), whose ambient-pressure reading the ECM uses to correct fueling and boost targets for altitude. Many BARO sensors live inside the ECM itself, in which case the module is replaced rather than a discrete part; where the sensor is external, a blocked or contaminated sampling port, a corroded connector, and a drifted sensing element are the common causes of a signal that is out of range or frozen at one value.

These 15 diagnostic trouble codes share one detection mechanism and one repair path, which is why MechanicDB groups them into a single authored fault family rather than repeating the same explanation 15 times.

Codes in this family (15)

Code	Definition	Repair coverage
P2226	Barometric Pressure Sensor A Circuit	4 ranked fixes
P2227	Barometric Pressure Sensor A Circuit Range/Performance	4 ranked fixes
P2228	Barometric Pressure Sensor A Circuit Low	4 ranked fixes
P2229	Barometric Pressure Sensor A Circuit High	4 ranked fixes
P222A	Barometric Pressure Sensor B Circuit	4 ranked fixes
P222B	Barometric Pressure Sensor B Circuit Range/Performance	4 ranked fixes
P222C	Barometric Pressure Sensor B Circuit Low	4 ranked fixes
P222D	Barometric Pressure Sensor B Circuit High	4 ranked fixes
P222E	Barometric Pressure Sensor B Circuit Intermittent/Erratic	4 ranked fixes
P2230	Barometric Pressure Sensor A Circuit Intermittent/Erratic	4 ranked fixes
P227A	Barometric Pressure Sensor C Circuit	4 ranked fixes
P227B	Barometric Pressure Sensor C Circuit Range/Performance	4 ranked fixes
P227C	Barometric Pressure Sensor C Circuit Low	4 ranked fixes
P227D	Barometric Pressure Sensor C Circuit High	4 ranked fixes
P227E	Barometric Pressure Sensor C Circuit Intermittent/Erratic	4 ranked fixes

What this page does not show

This page publishes the fault mechanism and the code index. The licensed dataset adds, for every one of the 15,886 codes, the full authored repair set (56,729 procedures in total) with the fields deliberately withheld here:

Procedures 2..n after the first-listed procedure
Aftermarket parts cost ranges in USD (est_parts_cost_min/max_usd)
Professional labor-hour estimates (est_labor_hours)
Step-by-step diagnostic and repair instructions
Replacement-part mappings and catalog lookups
6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)

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