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reference compare error
. Eliminated due to
redundancy with other existing fault types.
2D
1101 reserved
2E
1110 reserved
2F
1111 reserved
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Page 331
GM WORLDWIDE ENGINEERING STANDARDS
GMW3110
E1.3.4 DTC Failure Sub Type (Symptom) Definition of ECU Internal Failures.
Table E7: DTC Failure Sub Type Definition for Failure Category “3”
Failure
Type
Sub
Type
ECU Internal Failures
Note: 
This category includes faults related to memory, software, and internal electrical
circuitry; requiring component replacement.
Byte
Nibble 
Sub Type
(hex) (binary) 
Description
Definition
30
0000 reserved
31
0001 general checksum failure
This sub type is used by the ECU to indicate an incorrect
checksum calculation where memory type is not
specified.
32
0010 general memory failure
This sub type is used by the ECU to indicate a memory
failure where memory type is not specified.
33
0011 special memory failure
This sub type is used by the ECU to indicate a memory
failure where the specific memory type is not defined in
this category.
34
0100 RAM failure
This sub type is used by the ECU to indicate a Random
Access Memory (RAM) failure.
35
0101 ROM failure
This sub type is used by the ECU to indicate a Read
Only Memory (ROM) failure.
36
0110 EEPROM failure
This sub type is used by the ECU to indicate an
Electrically Erasable Programmable Read Only Memory
(EEPROM) failure.
37
0111 watchdog/safety µC failure
This sub type is used by the ECU to indicate a failure in
the execution of operational software.
38
1000 supervision software failure
This sub type is used by the ECU to indicate a loop time
error in the execution of the operational software.
39
1001 internal electronic failure
This sub type is used by the ECU to indicate the
detection of an internal circuit failure.
3A
1010 incorrect component installed
This sub type is used by the ECU to indicate a mismatch
between the hardware connected to the ECU and the
hardware expected by the ECU.
3B
1011 Internal Self Test Failed
This sub type is used by the ECU to indicate a sensor
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self-test failure launched by an ECU command.
3C
1100 Internal Communications Failure This sub type is used by the ECU to indicate loss of an
internal
communication
line,
e.g.,
between
microprocessors in a dual microprocessor configuration.
3D
1101 reserved
3E
1110 reserved
3F
1111 reserved