ZF enables trailer manufacturers to meet UN/ECE R156 requirements with ease, offering a comprehensive, customer-focused solution backed by deep industry expertise.
As a leader in trailer technology, we have already met the rigorous ISO 24089 standards for software update engineering, delivering safe and legally compliant solutions.
A Comprehensive Toolkit for Trailer Manufacturers to Master Software Updates with Confidence
With its modular design, customers can choose the tools and services they need, enabling safe software updates, while making compliance streamlined and efficient - a game-changer for trailer manufacturers.
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To support trailer OEMs in navigating the complexities of UN/ECE R156, ZF offers comprehensive consulting services to provide the necessary advice and ongoing guidance during the implementation of the needed processes and solutions.
ZF’s SCALAR Software Manager is a cloud-based, ISO 24089-certified platform for managing software updates in commercial vehicles. It enables the tracking, recording, and verification of software and hardware versions for all UN/ECE R156 relevant devices, while helping to simplify the execution of regular audits, certification renewals and technical inspections.
ZF [pro]Diagnostics, software platform for diagnosing and parameterizing of ZF devices, serves as an interface to the ZF’s SCALAR Software Manager to enable automated software status checks, safe updates and related documentations in compliance with UN/ECE R156.
A sophisticated handbook describing the mandatory processes, roles, and measures for trailer manufacturers, suppliers, and workshops is supplemented with exemplary templates and useful checklists, aiming to help trailer manufacturers understand their obligations according to UN/ECE R156.
A rigorous ISO 24089 certification for software update engineering confirms, ZF’s trailer products included in the SUMS Service Suite are fully aligned with UN/ECE R156 requirements, covering technologies such as:
Effortless Compliance for Trailer Manufacturers
ZF CVS sets a new industry benchmark to help trailer manufacturers comply with UN/ECE R156 Regulation
‘Peace of Mind’ for Trailer Manufacturers
ZF CVS is the first tier-1 supplier to the commercial vehicle industry serving trailer manufacturer to pass the stringent audits required for ISO 24089 certification, validating its excellence in automotive software update engineering.
The gained certificate provides strong proof-point for trailer manufacturers to trust ZF’s new SUMS Service Suite to achieve and maintain UN/ECE R156 compliance.
As CV trailers become increasingly equipped with advanced electronics, the need for secure, traceable software updates has become critical for enhancing vehicle safety, optimizing performance, and protecting against cyber threats.
To address this, the United Nations Economic Commission for Europe (UN/ECE) introduced the UN/ECE R156 , focusing on Software Updates and Software Update Management Systems (SUMS) for vehicles, including trailers.
To comply with UN/ECE R156, trailer manufacturers are mandated to implement a Software Update Management System (SUMS) within a defined timeline.
This goes beyond just a dedicated software solution; it requires a structured, well-documented process for managing software updates, along with regular audits and certification renewal every three years.
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UN/ECE R156 is an international regulation that requires vehicle manufacturers to manage and deploy software updates in a secure, safe, and traceable manner throughout the vehicle’s lifecycle.
To comply with UN/ECE R156 and obtain vehicle type approval, manufacturers must implement a Software Update Management System (SUMS).
UN/ECE R156 applies to commercial vehicles that support software updates, including trucks, vans, buses, trailers, and certain agricultural vehicles. In simple terms, any vehicle that supports software updates falls under UN/ECE R156.
The regulation covers the following vehicle categories:
• Category M – passenger transport (buses and coaches),
• Category N – goods transport (trucks, vans),
• Category O – trailers and semi‑trailers,
• Category R – agricultural and forestry trailers,
• Category S – towed agricultural and forestry machinery,
• Category T – agricultural and forestry tractors.
For these vehicle categories, UN/ECE R156 sets mandatory requirements for how software updates must be identified, validated, recorded, delivered, and documented to ensure continued safety, cybersecurity, and regulatory compliance.
Vehicle manufacturers must comply with UN/ECE R156 according to a phased timeline, with full compliance required by July 2026.
In the European Union, UN/ECE R156 compliance is linked to vehicle type approval and registration as follows:
Tip: Always confirm the exact timing and applicability with your national type‑approval authority - especially for small‑series, special‑purpose vehicles, and individual approval cases - because local administrative approaches and transitional arrangements can vary.
ISO 24089 is an international standard that defines requirements for safe, secure, and traceable automotive software updates. It covers both vehicle software update and the engineering processes used by suppliers to develop, deliver, and manage software updates.
For vehicle manufacturers, ISO 24089 is a practical framework and a useful way to assess supplier readiness. If a supplier is ISO 24089 certified, it can provide recognized evidence that the supplier follows structured software‑update engineering processes - often reducing the need for repeated supplier audits during the UN/ECE R156 SUMS approval journey. Manufacturers typically still need to check that the supplier’s ISO 24089 certification remains valid.
Important: ISO 24089 is not a substitute for UN/ECE R156 approval. Buying ISO 24089‑certified components alone is not sufficient. The manufacturer still needs to implement and maintain its own compliant Software Update Management System (SUMS) and must demonstrate conformity to R156 requirements.
As an example, ZF CVS has achieved ISO 24089 certification, demonstrating its ability to supply compliant, software‑update‑ready technologies to the commercial vehicle sector.
UN/ECE R156 is challenging for trailer manufacturers because trailers typically rely heavily on supplier-provided software systems, which makes coordination and governance more complex. Software updates have historically not been centrally tracked or standardized, and each trailer often has a unique configuration, increasing the complexity of validation, documentation, and auditability.
In addition, software updates are often carried out by independent workshops rather than a unified manufacturer network, making it harder to ensure consistent processes, tools, and evidence required for UN/ECE R156 compliance.
From July 2026 in the EU, registering and selling new vehicles under EU type‑approval routes without UN/ECE R156 compliance will generally be difficult. This is because UN/ECE R156 requires manufacturers to have secure, verifiable software‑update processes and documented software versions for every vehicle, supported by a certified Software Update Management System (SUMS).
Key risks of UN/ECE R156 non‑compliance include:
Tip: Always confirm the exact timing and applicability with your national type‑approval authority - especially for small‑series, special‑purpose vehicles, and individual approval cases - because local administrative approaches and transitional arrangements can vary.
The SUMS Service Suite is ZF’s modular Software Update Management System (SUMS) solution designed to help trailer manufacturers manage secure software updates and meet UN/ECE R156 requirements efficiently. It combines expert guidance with configurable tools and services, allowing manufacturers to select only what they need in order to implement safe and compliant update processes.
Built on ZF’s deep trailer‑technology expertise, the SUMS Service Suite streamlines the entire software‑update workflow and helps manufacturers achieve and maintain UN/ECE R156 conformity over the vehicle lifecycle.
The SUMS Service Suite brings together software tools, services, and documentation trailer manufacturers need in order to manage secure and UN/ECE R156‑compliant software updates.
It comprises SUMS‑ready ZF trailer products, advanced software tools such as ZF’s SCALAR Software Manager integrated with ZF [pro]Diagnostics, and a complete documentation package including handbook, templates, and checklists.
The suite also includes a training program and consulting services, supporting full‑vehicle UN/ECE R156 compliance across manufacturers, suppliers, and workshops.
By automating workflows and documentation, the SUMS Service Suite helps manufacturers achieve a smoother, lower‑risk certification process.
ZF’s SUMS Service Suite provides trailer manufacturers with a modular, ISO‑aligned toolkit that makes UN/ECE R156 compliance easier and more efficient.
It reduces the need for extensive in‑house development, offers expert guidance on meeting regulatory requirements, and supports safe, secure, and auditable software updates across the vehicle lifecycle.
Built in line with ISO 24089 software‑update engineering principles, the suite supports structured processes for software development, validation, and documentation, helping manufacturers reduce compliance risk and prepare for certification.
Compatible with ZF and third‑party technologies, the suite features a future‑proof, scalable design and enables automated software updates in workshops, helping manufacturers simplify audit and certification processes under UN/ECE R156.
Integrating ZF’s SCALAR Software Manager with ZF [pro]Diagnostics makes the software update process more efficient and easier to manage across the vehicle lifecycle by automating update data handling, version checks, and documentation instead of relying on manual processes.
The integration also enables UN/ECE R156‑compliant software updates in workshops. ZF’s SCALAR Software Manager manages update evidence and R156‑relevant data, while ZF [pro]Diagnostics executes updates automatically, safely, and securely in the field.
For trailer manufacturers, this reduces training effort and the risk of human error. It provides a secure and traceable update process that can be demonstrated to technical services and audit authorities - something that is difficult to build in‑house.
Overall, automation across the combined toolchain supports safer software updates, more reliable UN/ECE R156 compliance, and easier certification preparation.
ZF’s SUMS Service Suite is unique because it supports full‑vehicle compliance for UN/ECE R156, rather than focusing only on individual ECUs or isolated systems.
It combines modular software tools and services that enable easy adoption and a tailored certification journey. The suite secures software updates, automates workflows and documentation, and is backed by ISO 24089‑aligned software‑update engineering and proven success with certified customers.
By covering the full vehicle lifecycle, this approach helps trailer manufacturers save time, reduce compliance risk, and strengthen safety and cybersecurity across the entire software‑update and certification process.
Customers highlight three main strengths of ZF’s SUMS Service Suite: modularity, ease of use, and full‑vehicle scope. More than 25 trailer manufacturers already use the suite, with several having successfully achieved UN/ECE R156 certification.
Customers also emphasize the value of ZF’s documentation package, which serves as a practical blueprint for designing SUMS processes, complemented by ZF’s consultancy services and targeted training.
On the tooling side, the integration of ZF’s SCALAR Software Manager and ZF [pro]Diagnostics delivers the automation, security, and verification capabilities required for audit‑ready software‑update processes.
