What is UN R156 software update regulation?
Updated 2026-05-186 min read
UN R156 works alongside R155. Both are mandatory for new EU vehicle type-approvals from July 2024.
01
What R156 requires
A certified process for planning, testing and rolling out software updates.
Documented rollback procedures.
Verification that safety-relevant updates don't degrade compliance with other UN regulations.
02
Impact on Chinese EVs
Every OTA feature rollout in Europe requires SUMS approval — this is why Xpeng XNGP, NIO NOP+, and Zeekr NZP roll out slower in Europe than in China.
03
Owner benefits
OTAs cannot degrade type-approved safety functions.
Manufacturers are liable for update-induced failures.
Key takeaways
- 01R156 governs OTA and workshop software updates.
- 02Slower ADAS feature rollout in EU is largely due to R156 pre-approval process.
- 03OTAs cannot degrade type-approved safety.
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