DTC PZ2550, Storage Mode Entered
WARNING: This page is about a different car, the 1996 Cadillac Seville and 1996 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
To conserve power, PZM can be commanded into a storage mode. DTC PZ2550 will set when storage mode has been entered. DTC PZ2550 will clear when PZM receives a "wake-up" signal.