ISO/PAS 15118-202:2025

Publicly
Available
Specification
ISO/PAS 15118-202
First edition
Road vehicles — Vehicle to grid
2025-09
communication interface —
Part 202:
Extensible SECC Discovery Protocol
and Event Notification Protocol
Véhicules routiers — Interface de communication entre véhicule
et réseau électrique —
Partie 202: Protocole de découverte SECC extensible et protocole
de notification d'événements
Reference number
© ISO 2025
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Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Abbreviated terms . 2
5 Conventions . 3
5.1 Provision identifiers .3
6 Extensible SECC Discovery Protocol . . 3
6.1 General .3
6.2 Message structure .4
6.2.1 General .4
6.2.2 ESDPSetupReq/Res .4
6.2.3 ESDPReq/Res .5
6.3 Communication .5
6.3.1 General .5
6.3.2 EVCC.6
6.3.3 SECC .7
6.4 Encoding .8
6.5 ESDP extensions .8
6.5.1 General .8
6.5.2 Charging Interface extension .10
6.5.3 Electrical Charging System extension . 12
6.5.4 IPv6 Socket extension . 13
6.5.5 TLS 1.2 Info extension .14
6.5.6 Charging Service extension . 15
6.5.7 EMSP Info extension .19
6.5.8 AC Charging Parameters extension .19
6.5.9 Conductive Charging Interface Limitations extension. 20
6.5.10 EV Characteristics extension . 20
6.5.11 EVSE Characteristics extension .21
7 Event Notification Protocol .22
7.1 General . 22
7.2 Message structure . 22
7.3 Communication . 23
7.3.1 General . 23
7.3.2 EVCC. 23
7.3.3 SECC . 23
7.4 Encoding .24
7.5 ENP extensions .24
7.5.1 General .24
7.5.2 EVSE Grid Information extension . 26
7.5.3 Grid Code Impact Level extension .27
7.5.4 EV Stop Reason extension . 28
7.5.5 EVSE Stop Reason extension . 29
7.5.6 EV Derating Reason extension . 29
7.5.7 EVSE Derating Reason extension . 30
8 Security considerations.32
Bibliography .33

iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
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with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
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rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 31, Data
communication.
A list of all parts in the ISO 15118 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iv
Publicly Available Specification ISO/PAS 15118-202:2025(en)
Road vehicles — Vehicle to grid communication interface —
Part 202:
Extensible SECC Discovery Protocol and Event Notification
Protocol
1 Scope
This document specifies the Extensible SECC Discovery Protocol (ESDP) as well as the Event Notification
Protocol (ENP) that are intended to be used in conjunction with other protocols as defined in ISO 15118-2
and ISO 15118-20 as well as documents from other organizations such as DIN or SAE (e.g. DIN/TS 70121 or
SAE J2847/2).
These protocols can be used in addition to the existing SECC Discovery Protocol defined by the
aforementioned documents. They offer additional functionality that makes the digital communication for
EV charging more robust and allows to better determine the reason of failures.
In this document, the scope is limited to the already existing communication protocols. Thus, it is only
an addition to already existing communication protocols. Basic requirements regarding for example IP
communication, or the Vehicle-To-Grid Transport Protocol (V2GTP) are not needed, as they are already
specified in the respective document of the used communication pr
...