GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2001 🢒 Chevy C Cab/Chassis HD (GMT 400) 🢒 General Information 🢒 General Information 🢒 Engine ID and VIN Derivative Location

6.5L Diesel Engine
Object Number: 181919 Size: MF

The engine unit number or date code is either laser etched or stamped into the engine block.

8.1L Engine
Object Number: 661671 Size: SH
(1)Engine Identification Number Location

All engines are stamped with an eight digit engine identification number.

Engine ID
Object Number: 174106 Size: SH
(1)Source Code
(2)Month of Build
(3)Date of Build
(4)Broadcast Code