Carbon Reporting for Automotive Parts and Component Suppliers
Carbon Reporting for Automotive Parts and Component Suppliers
The automotive industry runs the most advanced and demanding supply chain carbon programmes in any sector. BMW, Volkswagen, Mercedes-Benz, Stellantis, Volvo, and Toyota have all published binding Scope 3 reduction targets — and they are actively collecting GHG data from every significant Tier 1 and Tier 2 supplier. If you manufacture parts, components, or assemblies for the automotive sector, carbon reporting is no longer optional.
Why Automotive OEMs Are the Most Demanding
Unlike retail or food sector buyers who are beginning their supply chain data collection, automotive OEMs have been running supplier sustainability programmes for 5–8 years. They are now moving from data collection to performance requirements:
- Volkswagen Group: All Tier 1 suppliers must report Scope 1, 2, and 3 emissions through the VW supplier portal. Reduction targets are embedded in new contract negotiations.
- BMW Group: Scope 3 supplier engagement programme targets a 20% reduction in supply chain emissions per vehicle by 2030. Suppliers completing carbon assessments receive preferred supplier status.
- Stellantis (Fiat, Peugeot, Citroën, Jeep, Maserati): Carbon data required for supplier qualification renewal. Scope 3 Category 1 (purchased goods) explicitly required from casting, stamping, and plastic component suppliers.
- Volvo Cars: Science-Based Target aligned programme. Suppliers requested to set their own SBTi-aligned targets as a condition of long-term supply contracts from 2025.
- Toyota (TNGA programme): European suppliers asked for Scope 1/2/3 data via Toyota's GSCM (Green Supply Chain Management) system.
The Emission Profile of an Automotive Parts Manufacturer
| Source | Scope | Notes |
|---|---|---|
| -------- | ------- | ------- |
| Process electricity (CNC, presses, injection moulding) | 2 | Often the largest single category |
| Natural gas (furnaces, heating, paint ovens) | 1 | Significant for casting, forging, coating operations |
| Diesel (forklifts, site vehicles) | 1 | Internal logistics |
| Refrigerants (process cooling) | 1 | CNC coolant systems, paint booths |
| Raw material purchase (steel, aluminium, plastics) | 3 (Cat 1) | Often 60–80% of total if calculated |
| Inbound freight | 3 (Cat 4) | JIT delivery schedules create high Category 4 |
| Employee commuting | 3 (Cat 7) | Manufacturing shift workers, often car-dependent |
Category 1 (Purchased Goods): The Big Number OEMs Want
Automotive OEMs are increasingly asking Tier 1 suppliers to calculate Scope 3 Category 1 — the embedded carbon in your raw material purchases (steel, aluminium, glass, plastics, copper wire). For a metal pressing company, Category 1 can be 5–10x your operational emissions.
For SME questionnaire responses, Category 1 is typically marked as optional or estimated using DEFRA spend-based factors. But OEMs are moving toward requiring it. Start collecting material purchase tonnages and supplier-specific emission factors now.
Generating Your Carbon Passport as an Automotive Supplier
DeCarbonOPS covers the operational categories (Scope 1, 2, and Scope 3 Categories 3, 5, 6, 7) that form the baseline of all automotive supplier questionnaire responses. Complete your operational GHG inventory first — it is the foundation that Tier 1 qualifications require regardless of whether Category 1 is also needed. Generate your Carbon Passport and use the verification URL in BMW, Volkswagen, Stellantis, and Toyota supplier portals.
Frequently Asked Questions
Which automotive OEMs have the strictest carbon reporting requirements for suppliers?
Volvo Cars currently has the most demanding programme, requiring Tier 1 suppliers to set SBTi-aligned reduction targets as a condition of long-term contract renewal from 2025. BMW Group and Volkswagen Group have the most comprehensive data collection systems with mandatory portal submissions. Stellantis is accelerating requirements for casting, stamping, and plastic component suppliers. Toyota's GSCM system is highly structured and has been running the longest.
Do I need to calculate Scope 3 Category 1 (purchased goods) as an automotive supplier?
Increasingly yes — especially for Tier 1 suppliers to BMW, VW, and Stellantis. Category 1 covers the embedded carbon in raw materials (steel, aluminium, plastics, rubber) and can be 5–10x your operational emissions. Start with operational Scope 1/2/3 (the mandatory baseline), then add Category 1 using DEFRA spend-based factors (approximately 2.47 kgCO2e/kg for primary steel, 8.24 kgCO2e/kg for primary aluminium) as an estimate until material-specific supplier data is available.
What is TISAX and does it relate to carbon reporting?
TISAX (Trusted Information Security Assessment Exchange) is an automotive industry information security standard — it is entirely separate from carbon reporting. Do not confuse TISAX compliance with sustainability or GHG requirements. Automotive carbon requirements are managed through separate sustainability portals (BMW Supplier Portal, VW Group Supply, Stellantis SRM) and sustainability questionnaires, not through TISAX.
How do I access the Volkswagen or BMW supplier portals for carbon data submission?
VW Group Supply (supplier.vwgroupsupply.com) and BMW Group SupplierPortal (supplierportal.bmwgroup.com) are supplier-facing platforms where carbon data is submitted. Access is granted when you are registered as a VW or BMW supplier. If you have not yet received a sustainability questionnaire through the portal, contact your OEM procurement contact — they can initiate the process or point you to the correct sustainability assessment module.
Do I need a separate GHG calculation for each automotive manufacturer I supply?
No — one GHG inventory for your company covers all of them. Your Scope 1/2/3 figures describe your organisation's total emissions for a given year regardless of which OEM you are reporting to. Submit the same figures to each OEM's portal, adjusted only for any format differences (some ask for separate Scope 3 categories, some ask for total Scope 3 only). A Carbon Passport URL can be included as supporting evidence in multiple portals simultaneously.
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