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GM WORLDWIDE ENGINEERING STANDARDS
GMW3110

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25.06.2020
WORLDWIDE ENGINEERING STANDARDS General Motors Local Area Network Enhanced Diagnostic Test Mode Specification
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© Copyright 2010 General Motors All Rights Reserved
February 2010
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E1.3.8 DTC Failure Sub Type (Symptom) Definition of Bus Signal Failures.
Table E11: DTC Failure Sub Type Definition for Failure Category “7”
Failure
Type
Sub
Type
Bus Signal/Message Failures
Note: 
This category includes faults related to bus hardware and signal integrity. This
category is also used when the physical input for a signal is located in one ECU and
another ECU diagnoses the circuit.
Byte
Nibble 
Sub Type
(hex) (binary) 
Description
Definition
70
0000 reserved
71
0001 invalid serial data received
This sub type is used by the ECU to indicate a signal
was received with the corresponding validity bit equal to
invalid 
or post processing of the signal determines it is
invalid.
72
0010 alive
counter
incorrect/not
updated
This sub type is used by the ECU to indicate a signal
was received without the corresponding rolling count
value being properly updated.
73
0011 parity error
This sub type is used by the ECU to indicate a message
was processed with an incorrect parity calculation.
74
0100 value of signal protection
calculation incorrect
This sub type is used by the ECU to indicate a message
was processed with an incorrect protection (checksum)
calculation.
75
0101 signal above allowable range
This sub type is used for failures where some circuit
quantity, reported via serial data, is above a specified
range.
76
0110 signal below allowable range
This sub type is used for failures where some circuit
quantity, reported via serial data, is below a specified
range.
77
0111 reserved
78
1000 reserved
79
1001 reserved
7A
1010 reserved
7B
1011 reserved
7C
1100 reserved
7D
1101 reserved
7E
1110 reserved
7F
1111 Erratic
This sub type is used for failures where the signal,
reported via serial data, is momentarily implausible or
discontinuous.
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