DTC B337: Loss Of HVAC Programmer Data: Intermittents
WARNING: This page is about a different car, the 1989 Cadillac Allante. However, it is still accessible from the selected car via links, so may be relevant.
If Code B337 shows as "History", without any other codes, then check the ignition feed, CPS ground, and data circuits for intermittent faults. If other data codes are stored, diagnose starting with lowest code first.