P222B on Chevrolet: How to Diagnose & Fix
Barometric Pressure Sensor "B" Circuit Range/Performance
1 Chevrolet model · 1 documented issue · $200-$2,500 repair
P222B on Chevrolet by model: symptoms, diagnosis and fix
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.
Common Symptoms
- Check Engine light (MIL) illuminated
- DTC P222B and/or P227B stored in the ECM
- Possible reduced boost or reduced power under full throttle
How to Fix
Have a Chevrolet dealer read the ECM, confirm P222B and/or P227B, and apply Bulletin #25-NA-239 for the 2025 LT7. Do not let a shop replace a turbocharger or boost-control actuator before the bulletin's diagnostic path has been followed - GM published this specifically to keep technicians from mis-diagnosing these two codes on the LT7. 2025 ZR1s remain inside the powertrain warranty, so this should be a no-charge repair.
Sources for this issue (1)
P222B 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 P222B mean on a Chevrolet?
P222B stands for "Barometric Pressure Sensor "B" Circuit Range/Performance." SAE-defined generic powertrain code. The engine control module uses barometric (ambient) pressure to correct fuelling, spark and — on boosted engines — the boost-pressure calculation. P222B sets when the second barometric pressure sensor (sensor "B") reports a value that is electrically in range but implausible: it does not agree with the other pressure sensors, with modelled barometric pressure, or with the value expected for the current conditions. The signal is present but the module has decided it cannot be trusted. On Chevrolet it is documented across 1 model: Corvette.
What are the most common causes of P222B?
The most common causes of P222B are: Failed or drifted barometric pressure sensor "B", Corroded, wet or loose sensor connector, or chafed signal/reference wiring, Restricted, blocked or contaminated sensor pressure port, Intake or induction leaks, or a restricted air filter, skewing sensor correlation on boosted engines, Faulty ECM (rare). The specific cause varies by vehicle.
How much does it cost to fix P222B on a Chevrolet?
Published repair estimates on Chevrolet range from $200 to $2,500 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.
Looking for P222B on a different make?
View P222B across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.