Starting from July 1, 2027, all new M1 and N1 vehicles in China must be equipped with mandatory in-vehicle emergency call systems as a compulsory national standard.
GB 45672-2025 In-Vehicle Accident Emergency Call System was officially released in April 2025, China’s first mandatory standard for automotive eCall. Over one year remains before implementation, while few automakers fully understand its core technical restrictions. This article analyzes the key regulatory constraints in depth.
The standard governs AECS (Accident Emergency Call System), which automatically or manually triggers emergency calls after vehicle accidents, transmits location and vehicle status data to the emergency platform, and establishes two-way voice communication.
Applicable models: M1 passenger cars and N1 light commercial vehicles (≤3.5 tons).
Implementation timeline & transition period:
·Mandatory official implementation date: July 1, 2027
·Newly declared models: Must be equipped with eCall synchronously with no exemption from July 1, 2027
·Existing approved models transition window: M1 vehicles until June 30, 2028; N1 vehicles until December 31, 2028
Project planning cannot wait until 2027; arrange progress reasonably based on model declaration status.
2. Core Relationship with UN R144
GB 45672-2025 is formulated with reference to UN R144 with consistent core eCall functions, but it is not a simple translation with deep localized modifications in three key aspects:
·Satellite Positioning: Mandatory Beidou support for in-vehicle terminals, allowing multi-mode fusion with GPS/GLONASS/Galileo per GB/T 45086.1-2024. No mandatory single Beidou mode; multi-mode positioning is the mainstream engineering solution.
·Communication Architecture: Starting with 4G LTE as the main channel, 5G upgrade is encouraged. 2G/3G fallback is allowed as redundant backup for special commercial vehicles, but cannot be used as the main communication channel.
·Background Platform Docking: Unlike EU/EAEU eCall only regulating vehicle terminals, China’s GB 45672-2025 includes unified national emergency service platform access specifications covering message format, local platform protocol and rescue center access standards. Terminal certification is only the first step; background platform docking compliance is also mandatory.
3. Core Technical Bottlenecks of GB 45672-2025
·Collision Trigger Logic: Mandatory automatic triggering under four working conditions: front collision, side collision, rear collision and vehicle rollover. Front/side/rear collision is fully enforced; rollover trigger is a clear standard direction waiting for industry technical maturity for full implementation. Four-direction collision signal processing logic must be included in system architecture design.
·Trigger Timing Sequence: eCall automatic trigger time shall not be later than vehicle restraint systems (airbag & seatbelt pretensioner), requiring synchronous or earlier activation instead of delayed response after restraint system deployment.
·Integrated Model Change Management: Many new vehicles integrate eCall into domain controllers or intelligent cockpit systems instead of independent T-Box. Hardware/communication module/software/trigger strategy changes will be judged as different model variants requiring re-evaluation and supplementary testing only if fully consistent can test reports be reused.
·Physical eCall Button Layout: Mandatory physical button configuration, accessible by the driver in normal sitting posture without unfastening the seatbelt. It limits interior minimalist design and requires durability & extreme working condition reliability compliance; co-pilot accessibility is not a mandatory standard requirement.
For China eCall GB 45672-2025 certification, consult Blueasia technical certification advisor: 13534225140
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