Why it matters?

A Question of Safety and Responsibility

Can you imagine someone replacing a critical part of your vehicle, such as the braking system, without ensuring that it meets the vehicle's Type Approval requirements? Do we accept jeopardising safety?

These questions highlight the core issue: software updates are no longer just technical interventions—they are safety-critical actions. In the same way that replacing a brake valve or an ECU must follow strict conformity rules, updating the software that controls these components must be equally regulated. Without proper oversight, a software change could unintentionally alter braking behaviour, disable safety functions, or expose the system to cyber threats. That’s why R156 matters: it ensures that every update is approved, documented, and secure.

Empowering Manufacturers to Take Control

Trailer manufacturers who take responsibility for the safety of their products throughout their lifecycle can now maintain control over software-related changes. With a certified Software Update Management System (SUMS), they can:

• Authorise updates before deployment

• Ensure compliance with type approval standards

• Protect vehicle integrity and user safety

• Demonstrate accountability to technical authorities

This is not just about regulation—it’s about building trust with customers, workshops, and distributors who rely on the long-term reliability of your products.

Cybersecurity and Lifecycle Integrity

As vehicle systems become increasingly digital, the risk of cyber threats grows. R156 is designed to mitigate vulnerabilities by enforcing robust update protocols before any potential attack can occur. It also ensures that updates do not unintentionally alter safety-critical functions or invalidate type approval.