An automotive supplier faces a stack of sustainability requirements rather than one portal: each OEM's own supplier assessment, the Drive Sustainability framework the OEMs share, Catena-X as the data infrastructure for carbon data, IATF 16949 read through an ESG lens, and sector regulation on top.
Before responding to any of them, establish which are active for you and what single data point they converge on.
| First question | Short answer |
|---|---|
| Which portals apply to me? | Only those of your direct customers. Prioritize by spend concentration. |
| Do the OEMs ask the same things? | Largely. Drive Sustainability aligns the content; each OEM still uses its own portal, timeline, and scoring. |
| What is Catena-X? | An open data ecosystem for passing Product Carbon Footprint data up the supply chain through connectors rather than questionnaires. |
| Does IATF 16949 cover ESG? | No. It intersects: ISO 14001 alongside it covers much of the environmental section, and its supplier-control clause is the channel for pushing requirements down. |
| What is the core data point? | The Product Carbon Footprint (cradle-to-gate) of what you supply. |
OEM program descriptions reflect published materials at the guide's last revision. Check your customer's current supplier requirements.
The pressure stack
- OEM-specific portals. Each major OEM runs its own supplier sustainability assessment, through EcoVadis or a proprietary portal such as BMW's iSupplier, Volkswagen's supplier sustainability portal, or Toyota's ASES (Automotive Supplier Evaluation System).
- Drive Sustainability. A coalition of OEMs that developed the Automotive Sustainability Guidance and aligned assessment questions, reducing but not removing duplication.
- Catena-X. An open ecosystem for sharing supply chain data, designed to pass Product Carbon Footprint (PCF) data up the automotive chain.
- IATF 16949. The automotive quality standard. No ESG requirements of its own; intersections that matter.
- Regulation. The EU Battery Regulation's carbon footprint requirements; CSRD obligations flowing down from large OEMs; national due diligence laws (Germany's LkSG, France's Duty of Vigilance).
Each layer asks for overlapping but not identical data. The administrative burden falls hardest on tier 2 and tier 3 suppliers without sustainability teams.
What the major OEMs ask for
Volkswagen Group. Among the most demanding. The Volkswagen Group Sustainability Rating evaluates suppliers on environment, labor, human rights, and ethics. Suppliers acknowledge VW's Code of Conduct and conduct risk-based assessment of their own sub-suppliers under Germany's Supply Chain Act. Direct suppliers are expected to pass requirements downstream, making tier 2 and 3 compliance contractual. VW's PCF requirements are advancing; suppliers in the battery and raw materials chain are asked for life-cycle-based carbon data.
BMW Group. Sustainability requirements run through the iSupplier portal, with EcoVadis assessment required for a significant part of the supply base. BMW's supplier relationship process scores sustainability alongside quality and delivery; EcoVadis scores below BMW's threshold trigger improvement plans or delisting risk. BMW has communicated that direct suppliers will provide cradle-to-gate carbon footprint data for key components.
Stellantis. The Supplier Sustainability Assessment covers environmental management, human rights, business ethics, and health and safety. As a founding Drive Sustainability member, its questionnaire aligns with that framework; answers can be cross-referenced, but submission through Stellantis's portal is still required.
Toyota. The ASES evaluation with Toyota's Supplier CSR Guidelines: self-assessment on environmental management systems, CO2 reduction, water, waste, supply chain risk management, labor standards, business ethics. Environmental requirements are detailed on CO2 reduction, with year-on-year improvement targets expected.
Drive Sustainability
A partnership of OEMs — including BMW, Ford, Honda, Mercedes-Benz, Renault, Toyota, and Volkswagen — created to align supplier ESG requirements. The Automotive Sustainability Guidance covers human rights, working conditions, environment, business ethics, and health and safety.
It reduces duplication without removing it: the questionnaire content is standardized, but suppliers still submit through each OEM's portal, on each OEM's timeline, under each OEM's scoring. Answers to Drive Sustainability-aligned questions can be reused across portals with minor adaptation. Treat the Drive Sustainability categories as the master answer set and adapt per portal — the same approach as multiple ESG questionnaires arriving at once.
Catena-X
An open data ecosystem built for the automotive sector, founded by OEMs and tier 1 suppliers, providing standardized exchange protocols so supply chain data — PCF data in particular — flows from tier 3 to tier 1 to OEM without each party running its own collection.
The core use case is the Product Carbon Footprint. PCF data for a component is calculated at the supplier using the WBCSD Pathfinder framework and transmitted upstream in a standardized format; the OEM receives it through the Catena-X connector rather than a questionnaire.
For a tier 1 supplying a Catena-X-connected OEM, two consequences:
- Calculating and certifying the PCF to Pathfinder methodology, which requires your Scope 1 and 2 plus relevant upstream Scope 3 for the materials you use.
- Onboarding technically: deploying a connector and registering with the Catena-X association. Software providers (Siemens, SAP, and others) offer connector software.
For tier 2 and tier 3, near-term pressure comes from the direct customer — the tier 1 — asking for carbon footprint data to meet its own Catena-X obligations, as a questionnaire, a data template, or a portal invitation. What a PCF calculation requires is in what customers need when they ask for a carbon footprint.
IATF 16949 and ESG
IATF 16949 is a quality management standard. It has no carbon reporting, human rights due diligence, or social audit requirements. The intersection is in three places.
Environmental management alignment. Many automotive suppliers hold ISO 14001 alongside IATF 16949. ISO 14001 covers environmental aspects, legal compliance, operational controls, and performance monitoring, all of which support the environmental section of any OEM portal.
Customer-specific requirements. IATF 16949 requires suppliers to identify and comply with customer-specific requirements. As OEMs embed sustainability in supplier contracts and CSRs, IATF auditors increasingly expect evidence that sustainability-related CSRs are identified and managed in the QMS. Not yet universal across certification bodies; the direction is clear.
Supplier control. Clause 8.4, externally provided processes, products and services, is the mechanism through which OEM sustainability requirements pass from tier 1 to tiers 2 and 3. Existing IATF supplier development and qualification processes can be extended to sustainability pre-qualification without a separate system.
Product Carbon Footprint
Across OEM portals, Catena-X, and regulation, the PCF is the central data point.
A component PCF covers emissions from raw material extraction to the factory gate (cradle-to-gate):
- Scope 1 — direct emissions from manufacturing (combustion, process gases)
- Scope 2 — purchased electricity and heat
- Scope 3, upstream — purchased materials and components, freight, other upstream activities
For most tier 2 and tier 3 suppliers, materials are the largest share. Steel, aluminum, plastics, and electronic components carry significant embedded carbon; for a stamped part in primary aluminum, the material can dominate the PCF. The product carbon footprint guide walks through the calculation. If your own Scope 1 and 2 figures are the gap, the free carbon calculator and Scope 2 calculator produce them from energy and fuel data.
Practical steps for tiers 1–3
Start with what IATF and ISO 14001 already provide. An environmental management system, documented aspects and impacts, energy and resource monitoring, legal compliance registers, internal audit trails. Pull these into one ESG data file before any portal submission; a large share of OEM environmental fields is answered from it.
Identify which portals are active. Check which your direct customers use and whether they want EcoVadis, a proprietary questionnaire, or Catena-X data. The OEM representing 40% of revenue comes before the one representing 5%.
Map carbon data gaps. The hardest PCF input is upstream material carbon intensity. Get primary data from material suppliers where possible; otherwise use recognized databases (ecoinvent, GaBi, PSILCA for social LCA) with documentation. OEMs know primary data availability varies by tier.
Build a master answer set on Drive Sustainability's categories. Human rights and working conditions, environment, business ethics, health and safety, sustainable procurement, each populated with current data, policies, certifications, and evidence links. This is the ESG response system applied to automotive.
Prepare policy documents. Most portals require uploads: environmental policy, supplier code of conduct, health and safety policy, human rights policy, anti-bribery policy, in current signed versions. A basic genuine policy beats a blank field. The ESG policy template guide covers what is needed.
Connect tier 2 and 3 suppliers early. A tier 1 cannot complete its OEM submission without sub-supplier data. Ask tier 2 and 3 for carbon data, policies, and basic ESG information at least six months before the portal deadline; many start from zero. State exactly what, why, and by when. The ESG response checklist gives smaller suppliers a format to work through.
Common mistakes
Inconsistent numbers across portals. Energy in one unit for one customer and another for a second; headcount that differs between questionnaires. OEMs cross-reference suppliers who appear on several portals.
Each portal as a standalone exercise. The data collected for one OEM is mostly the data the next needs. Centralize collection.
PCF left too late. A credible PCF takes weeks with energy and materials data ready, longer when chasing sub-suppliers. OEM portal deadlines do not move.
Regulatory direction
The EU Battery Regulation mandates carbon footprint declarations for EV batteries, with a methodology closely aligned to the Catena-X PCF approach and phased-in application; battery-adjacent suppliers face the hardest data requirements first. CSRD captures large automotive suppliers meeting its thresholds, and OEM customers use their own CSRD obligations to justify increasingly detailed requests down the chain.
Voluntary data sharing today becomes a contract requirement, then a regulatory obligation.