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Implementation of the Unified Diagnostic Service (UDS) protocol (ISO-14229) used in the automotive industry.

Project description

This project is an implementation of the Unified Diagnostic Services (UDS) protocol defined by ISO-14229 written in Python 3. The code is published under MIT license on GitHub (pylessard/python-udsoncan).


The documentation is available here :


  • Python 3.7+


using pip:

pip install udsoncan


import SomeLib.SomeCar.SomeModel as MyCar

import udsoncan
from udsoncan.connections import IsoTPSocketConnection
from udsoncan.client import Client
from udsoncan.exceptions import *
from import *


conn = IsoTPSocketConnection('can0', rxid=0x123, txid=0x456)
with Client(conn,  request_timeout=2, config=MyCar.config) as client:
      client.change_session(DiagnosticSessionControl.Session.extendedDiagnosticSession)  # integer with value of 3
      client.unlock_security_access(MyCar.debug_level)   # Fictive security level. Integer coming from fictive lib, let's say its value is 5
      client.write_data_by_identifier(udsoncan.DataIdentifier.VIN, 'ABC123456789')       # Standard ID for VIN is 0xF190. Codec is set in the client configuration
      print('Vehicle Identification Number successfully changed.')
      client.ecu_reset(ECUReset.ResetType.hardReset)  # HardReset = 0x01
   except NegativeResponseException as e:
      print('Server refused our request for service %s with code "%s" (0x%02x)' % (e.response.service.get_name(), e.response.code_name, e.response.code))
   except (InvalidResponseException, UnexpectedResponseException) as e:
      print('Server sent an invalid payload : %s' % e.response.original_payload)

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