ZF readies trailer makers for R156 software rules

From 7 July 2026, UNECE regulation R156 will require trailer manufacturers to take full responsibility for software updates across the vehicle lifecycle, shifting accountability from suppliers. ZF is offering a Software Update Management System (SUMS) Service Suite and said it is the first Tier 1 to the trailer industry to hold ISO 24089 certification.

Under R156, suppliers will continue to develop software but OEMs must approve, release, document and evidence every update. Trailers add complexity because they combine software from multiple suppliers, are serviced at independent workshops and undergo frequent parameter changes, including brake pressures, lift axle logic and reference tyre pressures, all of which count as software updates under the regulation.

ZF’s SUMS Service Suite pairs its Scalar software manager for centralised governance of updates across vehicle configurations with its [pro]Diagnostics tools for workshop-level execution and documentation. The supplier said the suite gives OEMs automated workflows and a single source of truth to keep compliance audit-ready.

In a statement, Dr Peter Bruns, SUMS Expert at ZF’s Commercial Vehicle Solutions division, said: “Approval gets vehicles on the road, but continuous compliance keeps them there.” Christian Hainzl, Head of Sales Trailer EMEA at ZF, added: “With the SUMS Service Suite, we are not adding another compliance product: we are providing the operational engine for software-defined trailers.”

Source: ZF