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. Under humid conditions or after short trips the accumulated water is slugged into the intake on a hard throttle application, causing a sudden multi-cylinder misfire, a stumble, and in some cases an underboost/turbocharger performance code. 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 shudder or stumble under acceleration
- Check engine light with random misfire codes
- Momentary loss of boost/power
- Symptom worse in humid weather or after short cold trips
How to Fix
Confirm the misfire pattern is not ignition or injector related, then perform GM TSB 18-NA-020: replace the charge air cooler with the updated part and clear codes. Reprogram the ECM to the latest calibration at the same time, and check the intercooler outlet duct for standing water during diagnosis.
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.