GoDiag GT109 | Interface Cable
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The GoDiag GT109 is a specialized interface cable designed for vehicles using the DoIP protocol (Diagnostics over Internet Protocol). This cable forms a direct, physical connection between the vehicle’s OBD2 port and an external diagnostic system or laptop via a RJ45 ethernet connection. The design is specifically aimed at data-intensive applications in the workshop, such as in-depth diagnosis, vehicle coding, and flashing or programming of control units (ECUs). By using a wired ethernet connection, an extremely high bandwidth is guaranteed, which is essential for safe and stable communication in modern vehicle networks.
Technically, this cable functions as a passive data bridge by directly forwarding Ethernet communication (ENET) from the OBD2 pins to the network card of the connected computer. The cable itself does not perform protocol translation; interaction and data processing are fully handled by the diagnostic software on the PC. A crucial addition for practical use is the built-in voltage meter in the OBD2 connector. It measures the current onboard voltage and displays it on the integrated display. If the supply voltage drops below 11 volts, the cable immediately activates an acoustic alarm. This instantly warns the technician of a risk of data loss and that diagnostics or programming must be stopped until an external battery charger is connected.
ADVANTAGES
KEY POINTS
Applications and functionalities
The interface cable facilitates direct network communication at OEM level for heavy diagnostic and programming processes in the workshop.
- DoIP diagnosis: Reading parameters and clearing fault codes in vehicle networks that communicate via Diagnostics over Internet Protocol.
- Vehicle coding: Adjusting configuration data and enabling hidden functions in control devices via ENET connections.
- ECU programming: Stable flashing of new firmware or software updates on control units where high ethernet bandwidth is necessary.
- Voltage monitoring: Continuously monitors vehicle voltage during operation to prevent module bricking due to power loss.
Special features and capabilities
The hardware is designed with built-in safety features to minimize risks during deep interventions in vehicle electronics.
- Digital LED display: Shows real-time exact onboard voltage directly on the OBD2 connector housing.
- Undervoltage alarm: Automatically generates a loud warning sound when voltage drops below the ~11V threshold, indicating an unsafe working condition.
- Passive network bridge: Forms a direct hardware Ethernet connection (ENET) without delaying internal chips for maximum data integrity.
Compatible vehicles
The cable is widely applicable to modern vehicles equipped with a DoIP/ENET network architecture. Compatibility depends on the diagnostic software used.
Confirmed car brands with DoIP support:
- BMW: Models with ENET architecture (F-series, G-series, I-series).
- Mercedes-Benz: Recent models with DoIP support.
- Volkswagen / Audi: Models on recent platforms with active DoIP communication via the gateway.
- Other brands: Land Rover, Volvo, and Geely (specific models equipped with DoIP support on the diagnostic port).
Compatible software and operating systems
Since this cable is a passive hardware interface, functionality is fully determined by external software packages. The cable is supplied without software.
Compatible software:
- ISTA / E-Sys: For diagnosis, coding, and programming via ENET on BMW.
- XENTRY: For DoIP vehicle diagnostics on Mercedes-Benz.
- Odis: For diagnosis and programming on DoIP-supported VAG models.
- OEM software: Compatible with Pathfinder (Land Rover) or VIDA (Volvo) if correctly configured for Ethernet/DoIP.
Operating systems:
- Windows: Windows 10 and Windows 11 (requires correct configuration of network adapter settings such as IP or DHCP, depending on software requirements).
Package Contents
- 1x GoDiag GT109 | Interface cable (2 meters)
Technical specifications
| Specification | Description |
|---|---|
| Product brand | GoDiag |
| Product model | GT109 |
| Product category | Interface cable |
| Vehicle connection | OBD2 (16-pin) |
| System connection | RJ45 (Ethernet) |
| Supported protocols | DoIP, ENET |
| Hardware features | Digital display, Low-voltage alarm (~11V) |
| Cable length | 2 meters |
| Software included | No |
