Note on Intermittents
WARNING: This page is about a different car, the 1990 Cadillac Fleetwood and 1990 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
If intermittent Code F12 is being set, manipulate related wiring while observing BCM data parameter P.2.8. If failure is induced, reading will jump from its normal value to a reading outside range of -29°F to 189°F (-34°C to 87°C).
If the value displayed by data parameter P.2.8 is not reasonably close to corresponding gauge pressure reading, check for poor terminal contact or replace sensor.