P2227 on GMC
Barometric Pressure Sensor "A" Circuit Range/Performance
P2227 on GMC vehicles indicates barometric pressure sensor "a" circuit range/performance. Au7o has documented this code across 1 GMC model — most commonly on Terrain. Generic code. The barometric pressure sensor 'A' is connected but its reading is out of range or doesn't track expected atmospheric pressure — the value is absent, inconsistent, or implausible versus other pressure sensors and known altitude. Typical repair costs on GMC range from $150 to $900, depending on the specific model and root cause.
Common Causes of P2227
- •Drifting/aging BARO or MAP sensor
- •Vacuum or pressure reference problem
- •High-resistance wiring/connector
- •Sensor contamination
- •Intermittent reference voltage
P2227 on GMC by Model
GMC Terrain(1 issue)
- Charge Air Cooler Moisture Freeze-Up - Misfire, Underboost and Reduced Engine Power in Cold Weather2018-2024
On the second-generation Terrain (2018+) with the turbocharged 1.5L LYX or 2.0L LTG engine, the air-to-air charge air cooler (intercooler) accumulates condensate from humid or rainy driving plus PCV-borne moisture. In cold ambient temperatures that water freezes inside the CAC core, restricting charge airflow. GM documents this in service bulletin 18-NA-020, originally issued for 2018-2022 and later expanded through the 2024 model year. Owners on the Terrain/Equinox forum describe ice and standing water inside the charge tube. This is a distinct failure from the CAC outlet duct popping off the throttle body and from the 1.5L PCV coolant/oil intrusion problem - here the cooler itself is obstructed by ice or contamination, not disconnected.
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What does P2227 mean on GMC?▼
P2227 stands for "Barometric Pressure Sensor "A" Circuit Range/Performance." Generic code. The barometric pressure sensor 'A' is connected but its reading is out of range or doesn't track expected atmospheric pressure — the value is absent, inconsistent, or implausible versus other pressure sensors and known altitude. On GMC specifically, this code is documented across 1 model.
What causes P2227 on GMC vehicles?▼
Common causes on GMC: Drifting/aging BARO or MAP sensor, Vacuum or pressure reference problem, High-resistance wiring/connector, Sensor contamination, Intermittent reference voltage. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P2227 on a GMC?▼
Repair costs on GMC range from $150 to $900, depending on the specific model and root cause.
Which GMC models have P2227 documented?▼
Au7o has documented P2227 on 1 GMC model: Terrain.