P227B on Chevrolet
Barometric Pressure Sensor 2 Performance
P227B on Chevrolet vehicles indicates barometric pressure sensor 2 performance. Au7o has documented this code across 1 Chevrolet model — most commonly on Corvette. General Motors names this code Barometric Pressure Sensor 2 Performance (in generic SAE terms, Barometric Pressure Sensor "C" Circuit Range/Performance). The ECM cross-checks each barometric pressure input against the others and against modelled ambient pressure. P227B sets when barometric pressure sensor 2 returns an irrational reading — one that is within its electrical limits but does not correlate with the rest of the pressure data. On multi-sensor forced-induction engines this code frequently appears alongside P222B, because the module is comparing several ambient/boost references against each other. Typical repair costs on Chevrolet range from $200 to $2,500, depending on the specific model and root cause.
Common Causes of P227B
- •Failed or drifted barometric pressure sensor 2
- •Damaged, corroded or loose connector and wiring at the sensor
- •Blocked or contaminated sensor reference port
- •Induction system leak, loose charge-air pipe or restricted air filter upsetting the correlation
- •Software calibration out of date (check for applicable manufacturer bulletins)
- •Faulty ECM (rare)
P227B on Chevrolet by Model
Chevrolet Corvette(1 issue)
- ZR1 LT7 Check Engine Light with DTCs P222B and/or P227B2025
GM released Bulletin #25-NA-239, 'Malfunction Indicator Lamp (MIL) Illuminated - DTC P222B and/or P227B Set,' with fitment limited to 2025 Corvette models equipped with the 5.5L twin-turbo LT7 - that is, the ZR1 only. Both codes fall in the boost-control/turbocharger DTC block, and the paired 'A'/'B' code structure lines up with the LT7's two turbochargers and their separate boost control channels. Because the bulletin is engine-code specific, this fault cannot occur on the naturally aspirated LT6 Z06, the LT2 Stingray, or the E-Ray.
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View P227B across all makes →Frequently Asked Questions
What does P227B mean on Chevrolet?▼
P227B stands for "Barometric Pressure Sensor 2 Performance." General Motors names this code Barometric Pressure Sensor 2 Performance (in generic SAE terms, Barometric Pressure Sensor "C" Circuit Range/Performance). The ECM cross-checks each barometric pressure input against the others and against modelled ambient pressure. P227B sets when barometric pressure sensor 2 returns an irrational reading — one that is within its electrical limits but does not correlate with the rest of the pressure data. On multi-sensor forced-induction engines this code frequently appears alongside P222B, because the module is comparing several ambient/boost references against each other. On Chevrolet specifically, this code is documented across 1 model.
What causes P227B on Chevrolet vehicles?▼
Common causes on Chevrolet: Failed or drifted barometric pressure sensor 2, Damaged, corroded or loose connector and wiring at the sensor, Blocked or contaminated sensor reference port, Induction system leak, loose charge-air pipe or restricted air filter upsetting the correlation, Software calibration out of date (check for applicable manufacturer bulletins). Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P227B on a Chevrolet?▼
Repair costs on Chevrolet range from $200 to $2,500, depending on the specific model and root cause.
Which Chevrolet models have P227B documented?▼
Au7o has documented P227B on 1 Chevrolet model: Corvette.