UN R83 Supplement 21 (06 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 21 to the 06 series of amendments
Supplement 20 → 21
- What changed
- At the manufacturer's request, type approval may be granted to M1, M2, N1 and N2 vehicles with reference mass ≤ 2,840 kg that meet this Regulation. Before, the text allowed the extension of a type approval to these vehicles.
- If applicable, openings in the exhaust system designed to remove condensate must be sealed before the test. They must be downstream of the last component of the exhaust after-treatment system which reduces tailpipe emissions, and documented in the information document (Annex 1).
- References to class H13 of EN 1822 in Annex 4A, Appendices 2 and 5, now give EN 1822:2019 instead of the 1998 or 2008 version.
- Why
- On occasion, the scope wording has caused concerns for some manufacturers, because the requirement was restricted to extensions of an existing approval.
- Condensate in the exhaust system can negatively impact the availability and quality of data from sensors within the exhaust system.
- The referenced EN 1822 standard is adapted to its newest version, from 2019.
Q1What changed10 changes
Type approval up to 2,840 kg reference mass (para. 1.1.)
At the manufacturer's request, M1, M2, N1 and N2 vehicles with a reference mass not exceeding 2,840 kg may get type approval under this Regulation. This is for vehicles which meet the conditions laid down in this Regulation. Before this supplement, a type approval granted under this Regulation could be extended from the vehicles mentioned above to these vehicles. This Regulation applies to vehicles of categories M1, M2, N1 and N2 with a reference mass not exceeding 2,610 kg.
Condensate openings in the exhaust system (Annex 4A, para. 3.2.2., and Annex 7, para. 5.1.1.)
If applicable, openings in the exhaust system designed to remove condensate must be sealed before the test (Annex 4A, para. 3.2.2.). These openings must be located downstream of the last component of the exhaust after-treatment system which reduces tailpipe emissions. The openings must be documented within the information document set out in Annex 1 to this Regulation. In Annex 7, paragraph 5.1.1.(a) now also says that these openings, as described in paragraph 3.2.2. of Annex 4a, must be sealed before the test. In paragraph 5.1.1.(c), the reference to paragraph 5.1.5. now says “of this annex” instead of “below”.
EN 1822:2019 for HEPA filters (Annex 4A, Appendix 2 and Appendix 5)
For primary dilution air in the CVS tunnel, the filter option in Appendix 2, paragraph 1.3.2., is at least class H13 of EN 1822:2019. Before, this option referred to EN 1822:1998. In Appendix 5, paragraphs 2.1.3., 2.3.1. and 2.3.3. use HEPA filters of at least class H13 of EN 1822:2019, or equivalent performance. Before, these paragraphs referred to EN 1822:2008. In each of these provisions, 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 has caused concerns for some manufacturers. It permitted approval of vehicles with reference masses between 2610 kg and 2840 kg if approved configurations of that vehicle type below 2610 kg existed. It did not permit approval if such configurations did not exist, because the requirement was restricted to extensions of an existing approval. According to the proposal, 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 as 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 due to the requirement being restricted to extensions of an existing approval.”
“This restriction can be seen as a market distortion as it affects different manufacturers differently depending on their product specifications.”
According to the proposal, this concern is becoming more relevant with the expansion of electrification of the fleet. Electrified vehicles are tendentially heavier, and they require 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 is one product of the combustion process of internal combustion engines, and it may condensate and remain in the exhaust system. Modern vehicles rely heavily on sensors within the exhaust system to control the engine or exhaust-aftertreatment system. For this reason, high sensor data availability and quality is crucial. Condensate in the exhaust system can negatively impact this data availability and quality. The proposal seeks to clarify the existing requirements of paragraphs 3.2.2. and 5.1.1. in conjunction with solutions to remove condensate from the exhaust system.
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 referenced EN 1822 standard is adapted to its 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 at the 91st GRPE session
- 2025-01ProposalECE/TRANS/WP.29/GRPE/2025/8Proposal by the experts from OICA on dynamometer preparation
- 2025-01RevisedECE/TRANS/WP.29/GRPE/2025/9Proposal by the experts from OICA, based on GRPE-91-12-Rev1
- —Amended in sessionGRPE-92-22Updated wording for Annex 4A, paragraph 3.2.2.
- —Working party adoptsECE/TRANS/WP.29/GRPE/92Session report, paras. 9, 10 and 14 (Annex V)
- 2025-08Sent to WP.29ECE/TRANS/WP.29/2025/96Text 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.215.2026.TREATIES-XI.B.16.83UN depositary notification
Q3Who is affected
Vehicle manufacturer
- For M1, M2, N1 and N2 vehicles with reference mass ≤ 2,840 kg that meet this Regulation, consider requesting type approval.
- Be ready to give validation documentation upon the responsible authority's request for tests following the dynamometer manufacturer’s recommendations (Annex 8).
Component supplier
- No direct action for this role.
Technical service / Approval authority
- Be ready for type-approval applications for M1, M2, N1 and N2 vehicles with a reference mass not exceeding 2,840 kg.
- Use HEPA filters of at least class H13 of EN 1822:2019, or equivalent performance, for PNC calibration and system checks.
- Where the primary CVS dilution air uses the filter option, check it is at least class H13 of EN 1822:2019.
- 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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