API Implementation of the OBD-2 Standard (ISO 15765-4)


For on-board diagnostics, the OBD-2 standard defines the exchange of specific vehicle parameters. The client makes a request on the connected control units (ECUs) in the vehicle to which one or several ECUs are answering. As part of OBD-2, the ISO 15765-4 standard describes the CAN bus as a transmission option.

The PCAN-OBD-2 API implements the functionality of the standard on the basis of 15 functions. They are categorized in Tester Allocation, Configuration, Information, Services, and Communication.

According to ISO 15765-4, OBD-2 is based on UDS. Analog to this, PCAN-OBD-2 uses the PCAN-UDS programming interface for the exchange of diagnostic data.


  • Implementation of the OBD-2 protocol (ISO 15765-4) as on-board diagnostics standard
  • Windows® DLLs for the development of 32-bit and 64-bit applications
  • Thread-safe API
  • Physical communication via CAN using a CAN interface of the PCAN series
  • Uses the PCAN-Basic programming interface to access the CAN hardware in the computer
  • Uses the PCAN-ISO-TP programming interface (ISO 15765-2) for the transfer of data packages up to 4095 bytes via the CAN bus
  • Uses the PCAN-UDS programming interface (ISO 14229-1) for the communication with control units

System requirements

  • Windows® 10, 8.1, 7 (32/64-bit)
  • At least 2 GB RAM and 1.5 GHz CPU
  • For the CAN bus connection: PC CAN interface from PEAK-System
  • PCAN-Basic API

Scope of supply

  • Interface DLLs for Windows® (32/64-bit)
  • Examples and header files for all common programming languages
  • Documentation in PDF format



API for the vehicle diagnostics according to OBD-2 (ISO 15765-4)

PCAN-OBD-2 API documentation


API for the development of applications with CAN and CAN FD connections for Windows® 10, 8.1, 7 (32/64-Bit)


API for the transfer of data packages according to ISO-TP (ISO 15765-2)


API to communicate with control devices according to UDS (ISO 14229-1)


Additional information on other pages:

PCAN-OBD-2 API version history
APIs for standardized protocols of the automotive sector
PEAK-System Forum: Section for the PCAN-OBD-2 API for questions and support


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