P0452 Evaporative Emission Control System Pressure Sensor Low Input
P0453 Evaporative Emission Control System Pressure Sensor High Input
Are both listed in 1997 Vortec cal and both unchecked for no reporting.
I think P codes are from PCM, then there's B codes which are Body Control Module, and C codes which are ABS/Suspension... there's a pattern but some codes overlap like these Fuel Sender is in B and Fuel Tank Pressure in B on later vehicles...
Then U codes is missing data stuff.
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