P2227 on Chevrolet: How to Diagnose & Fix
Barometric Pressure Sensor "A" Circuit Range/Performance
1 Chevrolet model · 1 documented issue · $150-$600 repair
P2227 on Chevrolet by model: symptoms, diagnosis and fix
On 1.5L turbo (LYX) Equinox models, moisture accumulates inside the charge air cooler (intercooler) and, in cold or highly humid weather, can freeze or pool enough to severely restrict intake airflow. This trips turbo underboost/MAP faults and pushes the engine into 'Engine Power Reduced' limp mode with sluggish acceleration. A related GM TSB also documents the charge air cooler outlet tube separating from the throttle body on 2018-2022 1.5L turbo models, producing the same reduced-power symptom. This is distinct from the known coolant-loss/intercooler-condensation head-gasket issue — here the failure is airflow restriction and boost loss, not coolant consumption.
Common Symptoms
- Engine Power Reduced warning / limp mode
- Loss of acceleration and turbo boost
- Worse in cold or humid weather
- Check engine light
How to Fix
Inspect and reseat or replace the charge air cooler outlet duct/clamp at the throttle body per GM TSB; clear accumulated condensate from the intercooler; verify the CAC and ducting for cracks. Reprogram the ECM if a related calibration update applies. For cold-weather freezing, GM bulletin 18-NA-020 calls for blocking cold air from the charge air cooler (CAC shutter or lower grille cover), thawing and washing out a frozen CAC, and an ECM calibration update on 1.5L (LYX) engines.
Sources for this issue (3)
- GM Bulletin 22-NA-224 - Reduced Engine Power, DTCs P0101/P0172/P0299/P0506/P1101 (CAC outlet tube separated from throttle body), Equinox 1.5L LYXtsb
- GM Bulletin 18-NA-020 - Poor Engine Performance in Extremely Cold Weather, DTCs P0300/P0299/P0234/P2227 (moisture freezing in charge air cooler)tsb
- GM PIP5651A - Charge Air Cooler Outlet Hose Disconnected From Throttle Body, 2019 Equinox 1.5L LYXtsb
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 Chevrolet?
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 Chevrolet it is documented across 1 model: Equinox.
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 Chevrolet?
Published repair estimates on Chevrolet range from $150 to $600 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.