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8.5.2.2 Request Message Data Parameter Definition. 
There are no data parameters used by this service.
8.5.3 Positive Response Message Definition (Table 76).
Table 76: Positive Response Message Definition
Data Byte Parameter Name
Cvt Hex Value Mnemonic
#1
returnToNormalMode Positive Response Service Id
M
60
SIDPR
8.5.3.1 Positive Response Message Data Parameter Definition. 
There are no data parameters used by this
service in the positive response message.
8.5.4 Supported negative response codes (RC_). 
The following negative response codes (Table 77) shall
be implemented for this service. The circumstances under which each response code would occur are
documented in the table below.
Table 77: ReturnToNormalMode Negative Response Codes
Hex Description
Cvt Mnemonic
12
SubFunctionNotSupported-InvalidFormat
This code is returned if the request message format is incorrect (too many
request message bytes).
M
SFNS-IF
--``,,``````,``,,``,,,`,`,`,,-`-`,,`,,`,`,,`---
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GM WORLDWIDE ENGINEERING STANDARDS
GMW3110
8.5.5 ReturnToNormalMode Message Flow Example. 
The following message flow example (Table 78)
shows what happens when a tester transmits a $20 ReturnToNormalMode request while diagnostic periodic
data is active ($AA service) and one-shot DTC information is being returned by the node in response to earlier
tester requests. Since the DTC response messages are one-shot data, the node is able to continue sending
the single shot UUDT frames after receiving the $20 request. Refer to the ReadDiagnosticInformation section
for more details regarding the operation of service $A9.
Since the information encapsulated in DPID $FE was scheduled, no further updates are received after the
service $20 acknowledgement (although there is a residual message $FE response between the service $20
request and positive acknowledgement. This is because the $FE DPID message was already in the protocol
device at the time the $20 request was received).
Refer to service $AA ReadDataByPacketIdentifier for more details regarding the operation of service $AA, and
the Flash Programming section of this specification for more details about how mode $20 is used to end a
programming session.
The following assumptions are made in the example below:
1. The tester had previously requested the node to report DTCs with a request for the $A9 service with a $81
value in the sub-parameter field. The response to this request is in progress but has not completed at the
time the $20 request is received.

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2. The tester had previously requested the node to transmit DPID $FE periodically.
3. The node has loaded into the protocol device (but not yet sent) a periodic update of DPID $FE when it
received the mode $20 request.
4. The node has a USDT physical request CAN ID of $241.
5. The node has a UUDT physical response CAN ID of $541.
6. The node has a USDT physical response CAN ID of $641.