Steps

Charging Station relays the EV's exiRequest (CertificateInstallationReq) to the CSMS in a Get15118EVCertificateRequest, embedding the base64 EXI payload and iso15118SchemaVersion.
CSMS forwards the request to its Contract Certificate Pool (CPO backend or MO-operated CPS) which validates the EV's OEM provisioning certificate chain against a trusted V2G/OEM root.
CPS signs and returns a CertificateInstallationRes (contract cert + sub-CAs + encrypted private key) which the CSMS wraps into a Get15118EVCertificateResponse (status, base64 EXI response).
Charging Station passes the EXI response back to the EV over the ISO 15118 channel; a separate CertificateSigned.req can push a renewed cert from the CSMS proactively (not driver-initiated).
Charging Station validates the certificate chain before installing; on failure it returns CertificateSigned.conf with status Rejected and must not proceed with Plug & Charge authorization.

Known gotchas

Get15118EVCertificate only works if the CSMS/CPO has a live contract with a Certificate Pool Operator (CPS) or V2G root — most CSMS vendors require a paid PKI subscription before this flow returns anything but errors.
The EXI payload size can exceed default WebSocket message limits configured on some CSMS gateways; increase max frame size or the response silently truncates.
A charge point can support ISO 15118-2 only, -20 only, or both — attempting Plug & Charge cert install against a station whose firmware only implements -2 will fail even though the OCPP message set looks identical.

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Install an ISO 15118 Plug & Charge contract certificate onto an EV via OCPP 2.0.1 (Get15118EVCertificate / CertificateSigned)

Steps

Known gotchas

Related routes

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