UN R83 Supplement 18 (07 series) · UNECE Regulation No. 83 (ECE R83) — Uniform provisions concerning the approval of vehicles with regard to the emission of pollutants according to engine fuel requirements.
UN R83 — Supplement 18 to the 07 series of amendments
Supplement 17 → 18
- What changed
- At the manufacturer's request, type approval may now be granted to M1, M2, N1 and N2 vehicles with a reference mass not exceeding 2,840 kg. These vehicles must meet the conditions laid down in this Regulation.
- Annex 4A, paragraph 3.2.2., now says that, if applicable, openings in the exhaust system designed to remove condensate must be sealed before the test. These openings must be located downstream of the last component of the exhaust after-treatment system which reduces tailpipe emissions.
- Under Annex 8, paragraph 5.2.6., the test can start following the dynamometer manufacturer’s recommendations if frictional losses can be stabilized without warming the dynamometer.
- Why
- The scope did not permit approval between 2610 kg and 2840 kg without approved configurations of that vehicle type below 2610 kg.
- Condensate in the exhaust system can negatively impact the availability and quality of sensor data.
- The text in the Regulation no longer represents the operation of modern chassis dynamometers.
Q1What changed9 changes
Type approval for vehicles up to 2,840 kg (para. 1.1.)
At the manufacturer's request, type approval may now be granted to M1, M2, N1 and N2 vehicles with a reference mass not exceeding 2,840 kg. These vehicles must meet the conditions laid down in this Regulation. Before, the text said that type approval granted under this Regulation may be extended from the vehicles mentioned above to these vehicles. Paragraph 1.1. applies the Regulation to vehicles of categories M1, M2, N1 and N2 with a reference mass not exceeding 2,610 kg.
Exhaust system openings designed to remove condensate (Annex 4A, para. 3.2.2., and Annex 7, para. 5.1.1.)
Annex 4A, paragraph 3.2.2., has new text on openings in the exhaust system designed to remove condensate. If applicable, these openings must be sealed before the test. They must be located downstream of the last component of the exhaust after-treatment system which reduces tailpipe emissions. Examples of such components are a catalytic converter and a particulate trap. The openings must be documented within the information document set out in Annex 1 to this Regulation. Item (a) of Annex 7, paragraph 5.1.1., now requires these openings, as described in paragraph 3.2.2. of Annex 4a, to be sealed before the test.
HEPA filters to EN 1822:2019 (Annex 4A, Appendices 2 and 5)
In Annex 4A, Appendices 2 and 5, the text now says “class H13 of EN 1822:2019” where it refers to a filter of at least class H13. Before, Appendix 2, paragraph 1.3.2., on dilution air conditioning, said “EN 1822:1998”. Before, Appendix 5, paragraphs 2.1.3., 2.3.1. and 2.3.3. said “EN 1822:2008”. In each changed sentence, only the year of EN 1822 changes.
Test start without warming the dynamometer (Annex 8, para. 5.2.6.)
Paragraph 5.2.6. of Annex 8 has new text. If frictional losses of the dynamometer can be stabilized without warming the dynamometer, the test can start following the dynamometer manufacturer’s recommendations. The manufacturer must provide documentation on the validation of the systems upon request of the responsible authority. Paragraph 5.2.6. also limits the time between dynamometer warming and the start of the emission test. The limit is 10 minutes if the dynamometer bearings are not independently heated, and 20 minutes if they are.
Q2Why it changed
- Proposed by
- Experts from the International Organization of Motor Vehicle Manufacturers (OICA)
- Working party
- GRPE, 92nd session (March 2025)
Reasons
On occasion, the scope wording caused concerns for some manufacturers. It permitted approval between 2610 kg and 2840 kg if approved configurations of that vehicle type below 2610 kg existed, but not otherwise. This restriction can be seen as a market distortion, because it affects different manufacturers differently depending on their product specifications.
Sources (3)
“On occasion the wording of this scope has caused concerns for some manufacturers”
“it permits approval of vehicles with reference masses between 2610 kg and 2840 kg if there are approved configurations of that vehicle type below 2610 kg but does not permit approval if such configurations do not exist”
“This restriction can be seen as a market distortion as it affects different manufacturers differently depending on their product specifications.”
This concern is becoming more relevant as electrification of the fleet expands. Electrified vehicles tend to be heavier, and they need a different vehicle type designation in the context of emissions-based regulations.
Source
“This concern is becoming more relevant with the expansion of electrification of the fleet due to a) electrified vehicles being tendentially heavier and b) electrified vehicles requiring a different vehicle type designation in the context of emissions-based regulations.”
Water from the combustion process of internal combustion engines may condense and remain in the exhaust system. Modern vehicles rely heavily on sensors in the exhaust system, and condensate can negatively impact the availability and quality of their data. The proposal seeks to clarify the existing requirements of paragraphs 3.2.2. and 5.1.1. in conjunction with solutions to remove condensate.
Sources (4)
“Water is one product of the combustion process of internal combustion engines which may condensate and remain in the exhaust system.”
“As modern vehicles rely heavily on sensors within the exhaust system to control the engine or exhaust-aftertreatment system, high sensor data availability and quality is crucial.”
“Both, data availability and quality, can be negatively impacted by condensate in the exhaust system.”
“This proposal seeks to clarify the existing requirements of 3.2.2. and 5.1.1. in conjunction with solutions to remove condensate from the exhaust system.”
The proposal adapts the referenced EN 1822 standard to the newest version, from 2019.
Source
“Adaption of the referenced EN 1822 standard to the newest version from 2019.”
The text in the Regulation no longer represents the operation of modern chassis dynamometers. This was recognized in the development of Annex 13 of UN GTR No. 15, and a fitting text was developed. According to the proposal, the text from UN GTR No. 15 should be included as an alternative in UN Regulation No. 83.
Sources (3)
“The text in the Regulation no longer represents the operation of modern chassis dynamometers.”
“This was recognized in the development of Annex 13 of UN GTR No.15 and a fitting text was developed.”
“The text from UN GTR No. 15 should therefore be included as an alternative in UN Regulation No. 83.”
Document trail
- —ProposalGRPE-91-12-Rev.1Informal proposal by the experts from OICA for the 91st GRPE session
- 2025-01ProposalECE/TRANS/WP.29/GRPE/2025/8Proposal by the experts from OICA on dynamometer preparation
- 2025-01ProposalECE/TRANS/WP.29/GRPE/2025/9Proposal by the experts from OICA on the scope, condensate openings and EN 1822
- —Amended in sessionGRPE-92-22OICA changes to the proposal for Annex 4A, paragraph 3.2.2.
- —Working party adoptsECE/TRANS/WP.29/GRPE/92GRPE session report, paras. 9, 10 and 15 and Annex VI
- 2025-08Sent to WP.29ECE/TRANS/WP.29/2025/97Text that GRPE sent to WP.29 and AC.1
- 2025-11WP.29 adoptsECE/TRANS/WP.29/1188Adopted at the 197th session (session report, para. 110)
- 2026-06-04In forceC.N.216.2026.TREATIES-XI.B.16.83UN depositary notification
Q3Who is affected
Vehicle manufacturer
- Check which compliant M1, M2, N1 and N2 vehicles up to 2,840 kg reference mass may now be approved.
- Be ready to give validation documentation for the systems upon request of the responsible authority (Annex 8).
Component supplier
- No direct action for this role.
Technical service / Approval authority
- Check that HEPA filters used for particulate counter checks are at least class H13 of EN 1822:2019, or equivalent performance.
- Be ready for test starts following the dynamometer manufacturer’s recommendations if frictional losses can be stabilized without warming (Annex 8).
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ⓘ This report gives advice only. It is not legal or type-approval advice.
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