The Informal Working Group on EV/HFCV Retrofit Systems held its tenth meeting on 2nd July 2026 in Brussels. The group reviewed progress reports presented to WP.29 Working Parties, referencing GRPE-92-14, GRPE-93-22-Rev.1, GRSP-78-17, GRVA-24-07, GRPE-94-06, and GRVA-25-19. Electrical safety will be reviewed later pending clarification on UN Regulation No. 100. The group excluded UN Regulation No. 155 from draft requirements to avoid cybersecurity complications. Braking requirements for retrofitted vehicles and applicability of UN Regulation No. 13/13-H require further assessment. Further coordination with the EMC Informal Working Group is required. The group distinguished battery range requirements for light-duty vehicles from heavy-duty vehicles.

Proposal to establish uniform provisions for approval of electric powertrain retrofit system installation on vehicles of categories M₁–M₃ and N₁–N₃:

• Add abbreviations section,
• Insert definitions of electric powertrain retrofit system, vehicle installation approval, approval of electric powertrain retrofit system, type of electric powertrain retrofit system, original vehicle, parent vehicle, and member of family,
• Modify scope to apply to electric powertrain retrofit systems and their installation on vehicles transformed,
• Delete prior scope provisions,
• Renumber paragraphs accordingly,
• Insert markings requirements for retrofit system installation plates,
• Add approval procedures and communication forms,
• Insert specific requirements regarding electric powertrain retrofit systems with compliance to applicable UN Regulations including UN R10, UN R13, UN R13H, UN R85, and UN R100,
• Insert application range provisions,
• Modify installer authorization requirements,
• Insert information requirements for retrofit system manufacturers to provide installers,
• Insert end-user manual requirements,
• Add provisions for periodic technical inspection including retrofit system identifiability and certification requirements,
• Insert conformity of production procedures,
• Modify procedures for extension and modification of approval,
• Modify penalties for non-conformity and withdrawal procedures,
• Insert introductory provisions explaining the Regulation’s purpose,
• Insert names and addresses reporting requirements for technical services and type approval authorities,
• Split Annexes 1, 2, 3, 4, 5, 6, and 7 into separate provisions for electric vehicles and hydrogen fuel cell vehicles,
• Insert Annex 5 specific requirements aligned with UNECE Regulations including electromagnetic compatibility, braking, electric drive train power measurement, rechargeable energy storage system compliance with phased timeline from date of entry into force to 1 September 2031 for UNECE Regulation 100 compliance, and other applicable regulations.

The provisional agenda for the tenth meeting of the Informal Working Group on EV/HFCV Retrofit Systems on Thursday 2nd July 2026 includes adoption of the agenda, approval of minutes, coordination and organization of work with reference to GRPE-92-14, EV/HFCV-02-02, GRPE-93-22/Rev.1, GRSP-78-17, GRVA-25-19, and WP.29-199-16, electrical safety review, braking, EMC, power determination and battery range, UN Draft, and any other business, with subsequent meetings scheduled for 9th September online and 8th October online.

Proposal to add an Abbreviations section, redefine scope to apply to electric powertrain retrofit systems for M₁–M₃ and N₁–N₃ vehicle categories intended to be transformed into pure electric vehicles (EV) or Hydrogen Fuel Cell Vehicles (HFCV), replace “conversion” terminology with “transformation” throughout, separate requirements into distinct annexes for EVs and HFCVs, add a Provisions for PTI section specifying retrofit system identifiability and certificate requirements, insert transitional dates for REESS compliance with UN Regulation 100 (31 August 2027 onwards for new types; 31 August 2029 onwards for all types), insert transitional dates for braking compliance with UN Regulation 13 (31 August 2026–2029 for new types; 31 August 2028–2031 for all types) and UN Regulation 13-H (31 August 2028 for new types; 31 August 2030 for all types), add mass distribution verification requirements when unladen weight variation exceeds 5%, and align mass and dimensions procedures with regional requirements such as EU 2021/535.