Use a combination of light compressed air and a shop towel to remove any residual moisture. There is no need to replace the sensor and hose.
This bulletin applies to 2020-2023 Chevy Blazer vehicles equipped with a 2.0L engine. If you encounter a vehicle setting DTC P04FB in temperatures below freezing that has failed current or history, complete the published SI diagnostics for the DTC.
If unable to establish a root cause, remove the PCV/crankcase pressure sensor and hose assembly and inspect the frozen moisture/condensation in the sensor and hose assembly. If frozen moisture is found, allow the assembly to thaw out and drain completely.
Use a combination of light compressed air and a shop towel to remove any residual moisture. There is no need to replace the sensor and hose.
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