Common 4 Digit PROM - Scan ID

File In Section: 6E - Engine Fuel & Emission

Bulletin No.: 57-65-07

Date: March, 1995

SUBJECT:
Common 4 Digit PROM Scan ID

MODELS:
1994-95 Chevrolet and GMC Truck C/K Models, G Vans, P Motorhomes with 6.5L Engine (VINs F, S, P - RPOs L65, L56, L49)

Some of the 1995 Model Year vehicles have the same PROM scan ID as 1994 vehicles. However, the Broadcast Code (BCC), Powertrain Control Module (PCM) and the service part numbers are different for each model year. A technician will notice on the Tech 1 scan tool that some of the 1995 PROM ID's are the same as 1994 PROM ID's and may order an incorrect PROM for the 1995 vehicle.

There was a coincidence in the PROM scan ID numbering system.

The model year of a vehicle is important when ordering a PROM. Do not replace a 1995 PROM with a 1994 PROM application. Use 1994 PROMs for 1994 models.