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GM WORLDWIDE ENGINEERING STANDARDS
GMW3110
The DTC Failure Category is decoded in the High Nibble of the 
DTC Failure Type Byte 
and the Failure Sub
Type is decoded in the Low Nibble of the 
DTC Failure Type Byte. 
Refer to Table E2.
Table E3 provides the DTC Failure Type Byte category definitions.
Table E2: DTC Failure Type Byte Definition

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DTC Failure Type Byte Definition
High Nibble ($0x thru $Fx)
Low Nibble ($x0 thru $xF)
DTC Failure Category
DTC Failure Sub Type
Table E3: DTC Failure Category Definition
DTC Failure Type Byte Category Definitions
High Nibble (0000b thru 1111b) Category # Category Description
0000
0
General Electrical Failures
0001
1
Additional General Electrical Failures
0010
2
FM/PWM (Frequency/Pulse Width Modulated) Failures
0011
3
ECU Internal Failures
0100
4
ECU Programming Failures
0101
5
Algorithm Based Failures
0110
6
Mechanical Failures
0111
7
Bus Signal/Message Failures
1000 thru 1110
8 thru E
Reserved By Document
1111
F
Unique System Specific (assignments made by service
operations and coordinated with manufacturing dept.)
E1.2.1 Definition and Appropriate Uses Of DTC Failure Type Value $00. 
The DTC Failure Type value zero
($00) is used to indicate that no additional information is available beyond that provided by the description for
the DTC two (2) byte base code. Although the value of zero ($00) falls into the General Electrical Failures
category, it can also be used for other types of DTCs as long as no other fault type values exist that would
provide additional information.
In cases where legislative requirements do not allow the reporting of DTCs with a fault type byte (e.g.,
emissions related DTCs), the ECU may choose to report its DTCs via enhanced diagnostic services with the
fault type byte coded to zero ($00). This approach allows the same DTC tables to be used for reporting DTCs
with both legislated and enhanced diagnostic services.