For thirty years truck diagnostics ran on J1708, then J1939 over CAN. The third generation is here: DoIP — Diagnostics over Internet Protocol — running over Ethernet at 100 Mbit+. It's arriving first on 2025+ European platforms and electric trucks, and it changes the hardware you need.
Why DoIP exists
CAN-FD tops out around 5 Mbit/s. A modern truck's software update or full-ECU data dump is gigabytes — hours over CAN, minutes over Ethernet. As trucks gain ADAS, EV powertrains and over-the-air update capability, Ethernet becomes the backbone and diagnostics rides on it via ISO 13400 (DoIP).
Where DoIP stands in heavy-duty (2026)
| Platform | Status | Notes |
|---|---|---|
| Volvo/Mack 2025+ | DoIP-capable via Vocom II | Vocom II already speaks DoIP — ahead of the market |
| Electric trucks (all) | DoIP primary | EV platforms launched Ethernet-native |
| European 2026+ models | Transitioning | Following the light-vehicle pattern with 2–3 year lag |
| Cummins/Detroit/PACCAR current | CAN/CAN-FD — no DoIP yet | Watch 2027+ platform refreshes |
| Chinese new-energy trucks | DoIP + GB/T protocols | See Chinese truck hub |
Hardware implications
- Your VCI needs Ethernet. Vocom II and TEXA Multihub 2 have it today; USB-Link 3 and INLINE 8 are CAN-era devices.
- Cables change: OBD-to-RJ45 Ethernet leads replace Deutsch on DoIP ports — we stock them.
- Software follows: diagnostic applications add DoIP stacks via updates — Jaltest, TEXA and PTT are furthest along.
- Coexistence: trucks will run CAN and Ethernet gateways in parallel for a decade — your CAN tools stay relevant, but new purchases should be DoIP-aware.
What to buy today
If you're buying a VCI in 2026 for a 5-year horizon, DoIP capability should be on the checklist: Vocom II for Volvo/Mack shops, TEXA Multihub 2 for multi-brand. For everyone else, CAN-FD-capable hardware (USB-Link 3, INLINE 8) covers current fleets with years of runway — but verify your next purchase against this page. The RP1210 vs J2534 guide covers the rest of the protocol landscape.
Bottom line
DoIP is not a reason to panic-buy — it's a reason to check the spec sheet. Every adapter and platform page on this site lists DoIP status; we've done the tracking so the spec sheet means something.
Frequently Asked Questions
Do I need DoIP capability today?
Only if you service 2025+ Volvos/Macks, electric trucks, or Chinese new-energy platforms. For standard diesel Class 8 work, CAN/CAN-FD covers everything on the road — but buy DoIP-capable hardware on your next refresh.
Will DoIP make my current scanner obsolete?
No — trucks will carry CAN networks alongside Ethernet for a decade or more. Obsolescence risk is real only for tools bought today without CAN-FD, which new platforms already require.
What is the DoIP cable called?
Typically an OBD-to-RJ45 (Ethernet) diagnostics lead, or a direct Ethernet port on the vehicle side. We stock both patterns; the cable finder flags DoIP-equipped models.