Diagnostic Protocols

Talk to any ECU, on any transport.

UDS over CAN. UDS over DoIP. Legacy KWP2000. Emissions-mandated OBD-II. Calibration-grade XCP. Pick your protocol and dive into the services that matter.

UDS

Unified Diagnostic Services — ISO 14229, the universal diagnostic protocol.

Application (ISO 14229-1)

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DoIP

Diagnostics over IP — UDS transported over Automotive Ethernet.

ISO 13400

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OBD-II

On-Board Diagnostics II — emissions diagnostics standardized worldwide.

ISO 15031 / SAE J1979

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KWP2000

Keyword Protocol 2000 — predecessor of UDS over K-Line / CAN.

ISO 14230

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XCP

Universal calibration & measurement protocol.

ASAM MCD-1 XCP

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UDS service catalog

All 18 core ISO 14229 services at a glance.

SID	Service	Description
0x10	DiagnosticSessionControl	Switches the ECU between diagnostic sessions (default, programming, extended).
0x11	ECUReset	Resets the ECU (hard, key-off-on, soft).
0x14	ClearDiagnosticInformation	Clears DTCs by group identifier (0xFFFFFF clears all).
0x19	ReadDTCInformation	Reports stored DTCs and their status.
0x22	ReadDataByIdentifier	Reads data record(s) for one or more 16-bit DIDs.
0x23	ReadMemoryByAddress	Reads raw memory at a given address/length.
0x27	SecurityAccess	Seed/key handshake to unlock protected services.
0x28	CommunicationControl	Enables/disables tx/rx of normal communication frames.
0x2E	WriteDataByIdentifier	Writes a data record for a 16-bit DID.
0x2F	InputOutputControlByIdentifier	Forces an actuator/input value (e.g. force fan ON).
0x31	RoutineControl	Starts, stops or queries a routine (RID).
0x34	RequestDownload	Initiates an ECU download (flashing).
0x35	RequestUpload	Initiates an ECU upload (read-out).
0x36	TransferData	Transfers a block during download/upload.
0x37	RequestTransferExit	Terminates a download/upload sequence.
0x3D	WriteMemoryByAddress	Writes raw memory at a given address.
0x3E	TesterPresent	Keep-alive to prevent session timeout (S3 timer).
0x85	ControlDTCSetting	Enables/disables DTC storage during testing.

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