P2227 on GMC: How to Diagnose & Fix
Barometric Pressure Sensor "A" Circuit Range/Performance
1 GMC model · 1 documented issue · $150-$900 repair
P2227 on GMC by model: symptoms, diagnosis and fix
On the second-generation Terrain (2018+) with the turbocharged 1.5L LYX/LSD 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, first released in January 2018 and later expanded through the 2024 model year. Owners on the Terrain/Equinox forum describe ice and standing water inside the charge tube. Here the cooler itself is blocked by ice or contamination; the duct has not come off the throttle body.
Common Symptoms
- Check engine light in cold weather
- Reduced engine power message
- Rough running and misfire
- Loss of boost / sluggish acceleration
- Water or ice found inside the charge pipe
How to Fix
Follow 18-NA-020: leak-test the CAC, thaw and clean a non-leaking contaminated cooler, and install only the thermostatic shutter the bulletin specifies for the vehicle's engine and climate. A universal intercooler or grille insert is not the prescribed repair.
Sources for this issue (3)
P2227 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P2227 mean on a 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 it is documented across 1 model: Terrain.
What are the most common causes of P2227?
The most common causes of P2227 are: Drifting/aging BARO or MAP sensor, Vacuum or pressure reference problem, High-resistance wiring/connector, Sensor contamination, Intermittent reference voltage. The specific cause varies by vehicle.
How much does it cost to fix P2227 on a GMC?
Published repair estimates on GMC range from $150 to $900 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.