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GM WORLDWIDE ENGINEERING STANDARDS
GMW3110
Table C17: Definition of Manufacturing Traceability Characters dataIdentifier
DID
Description
R/W Data Type
Len
$B4 
Manufacturing Traceability Characters (MTC)
R
ASCII
16
This DID contains the data necessary to meet the component traceability requirements as specified in
GMW4710 and GMW15862. The length of this DID is variable but shall not exceed 16 characters. These
fields are populated at the time of component manufacturing by the manufacturer. The ECU specific CTS
or supplemental diagnostic specification referenced by the CTS or SSTS must document how the fields
are to be populated.
Legacy Format (To be phased out per GMW15862) 
A description of each field follows:
Component Identifier (Comp Id)
The component Identifier is a 2 byte field (starting at byte 1 of the DID) that is used to indicate the
component type.
Part Number / Broadcast Code (PN/BC)
This is a 4-byte field (starting at byte 3 of the DID) and contains either the ECU Broadcast Code or the
last 4 digits of the ECU part number.
Supplier Code (sup)
This is a one byte field occupying the 7
th 
byte of the DID that identifies the supplier and manufacturing
location of the ECU.
Traceability Number
This field starts at byte 8 of the DID and is 9 bytes in length. The content is assigned by the module
manufacturer. This field contains information about the ECU at the time of its manufacture. Examples of
the type of data included in this field are Julian Date of production, shift build data, production assembly
line information and ECU serial number. If less than 9 characters are required to uniquely identify an
ECU, then the leading characters shall be filled with zeroes (0x30).

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Position
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16
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MTC
A
S
7
0
8
1
K
1
5
0
6 1 0 0 0 F
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Hex value
41 53 37 30 38 31 4B 31 35 30 36 31 30 30 30 46
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Field Desc.
Comp Id
PN/BC
sup
Traceability Number
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