89 Deville Bad ECM or just the MEM-CAL chip

My climate control and fuel data center are showing nothing but a digital c. I have disconnected the battery and the data will show for a minute or two. While driving, everything will sometimes go to a normal mode again for a minute or so. I get a E52 code (Electronic Control Module memory reset). Will repacing the MEM-CAl fix this problem?

The E52 code is from disconnecting the battery.