For 1990-2009 cars only
DTC 52 PROM (CAL-PAK) Missing for Chevrolet Chevrolet C-Series Medium Duty Truck C6/C7/C8 1998
Check for missing the PROM (CAL-PAK) and that all pins are fully inserted in the socket. If OK, replace the ECM. Refer to Engine Control Module Replacement .
