P2227 on Buick: How to Diagnose & Fix
Barometric Pressure Sensor "A" Circuit Range/Performance
1 Buick model · 1 documented issue · $450-$1,100 repair
P2227 on Buick by model: symptoms, diagnosis and fix
The 2.0L LTG turbo's air-to-air charge air cooler collects condensate in its lower core. After long drives in rain or high humidity (heavy fog), a hard throttle application can draw the accumulated water into the engine, causing a sudden multi-cylinder misfire (P0300) and a stumble; in cold weather the moisture can freeze inside the cooler, restricting flow and setting underboost codes P0299/P2227. GM issued TSB 18-NA-020 with a charge air cooler replacement procedure specifically for moisture-related MIL complaints. This affects only the turbocharged LTG cars, not the naturally aspirated 2.5L LCV.
Common Symptoms
- Sudden stumble or misfire on hard acceleration
- Check engine light with random misfire code P0300
- Momentary loss of boost or power
- Worse after long drives in rain or high humidity, or in cold weather
How to Fix
Confirm the misfire pattern is not ignition or injector related, then perform GM TSB 18-NA-020: wipe residual moisture from the boost sensor, smoke-test the charge air cooler, and replace it with the newly designed (wider) part plus the new lower baffle if it leaks or if the vehicle was built on or before January 5, 2019; later builds with no leak go to further diagnosis. Check the intercooler outlet duct for standing water during diagnosis. The bulletin repair is billed under powertrain coverage.
Sources for this issue (2)
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 Buick?
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 Buick it is documented across 1 model: Envision.
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 Buick?
Published repair estimates on Buick range from $450 to $1,100 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.