Code 1623, Prom Error

WARNING: This page is about a different car, the 1995 Pontiac Trans Sport, 1995 Oldsmobile Silhouette, and 1995 Chevrolet Lumina APV. However, it is still accessible from the selected car via links, so may be relevant.

Check that PROM is correctly inserted in socket. If okay, replace PROM, clear memory and recheck. If Code P1623 reappears, replace control module.

NOTE: To prevent possible electrostatic discharge damage to control module or PROM, DO NOT touch component leads. DO NOT remove integrated circuit from carrier.