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8.18.3.3 Positive Response Message Definition - $Level $81 (readStatusOfDTCByStatusMask -
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endOfDTCReport) (Table 179).
Table 179: ReadDiagnosticInformation(readStatusOfDTCByStatusMask) UUDT endOfDTCReport
Response Message
Data Byte Parameter Name
Cvt Hex Value Mnemonic
#1
MessageNumber = [ readStatusOfDTCByStatusMask ]
M
81
RSDTCBS
#2
#3
#4
#5
EndOfDTCReport = [
endOfDTCReportHighByte
endOfDTCReportMiddleByte
endOfDTCReportLowByte
DTCStatusAvailabilityMask ]
M
00
00
00
xx
EODTCR_
EODTCRH
EODTCRM
EODTCRL
DTCSAM
8.18.3.4 Positive Response Msg. Definition - $Level $82 (sendOnChangeDTCCount). 
The following UUDT
message shall be sent in response to the tester’s $A9 $Level $82 request. It shall also be sent whenever the
count of the number of DTCs satisfying the tester defined mask changes during background execution of the
send-on-change DTC count algorithm. See Table 180.
Page 200
GM WORLDWIDE ENGINEERING STANDARDS
GMW3110
Table 180: ReadDiagnosticInformation(sendOnChangeDTCCount) UUDT Positive Response Message
Data Byte Parameter Name
Cvt Hex Value Mnemonic
#1
MessageNumber = [ sendOnChangeDTCCount ]
M
82
SOCDTCC
#2
#3
DTCCountRecord = [
DTCCountHighByte
DTCCountLowByte ]
M
xx
xx
DTCCREC_
DTCCH
DTCCL