Sustainability in the Automotive Industry: A Guide for OEMs and Suppliers

Sustainability in the automotive industry is the work of measuring and reducing the environmental impact of building, moving, and using vehicles — across materials, suppliers, manufacturing, logistics, products, and the vehicle's life on the road.

For most of the last two decades, that work sat with automakers. It is now moving through the entire supply chain.

An OEM sets a carbon reduction target. To hit it, the OEM needs emissions data from its Tier 1 suppliers. Those suppliers need data from Tier 2. Tier 2 needs data from Tier 3 machine shops, material processors, and specialty manufacturers that may have no sustainability department at all.

The result is a two-sided problem that defines automotive sustainability today:

• Companies need sustainability data from their suppliers.
• Suppliers need to provide sustainability data to their customers.

This guide covers both sides. It explains where automotive emissions come from, what OEMs are asking suppliers to produce, how product-level carbon data works, and what a practical program looks like for a company that is not a global automaker.

1. What Is Sustainability in the Automotive Industry?

Automotive sustainability is broader than tailpipe emissions and broader than electrification. It covers the full set of environmental impacts associated with designing, sourcing, building, distributing, using, and eventually recycling a vehicle.

In practice, it spans:

• Materials — steel, aluminum, plastics, glass, rubber, electronics, battery materials
• Suppliers — the emissions embedded in purchased parts and components
• Manufacturing — energy, process heat, machining, stamping, casting, painting
• Energy — electricity sourcing, on-site generation, efficiency
• Transportation — inbound and outbound freight across a global network
• Products — the carbon footprint of a specific part or component
• Vehicle lifecycle — fuel or electricity consumed over years of driving
• Circularity — recycled content, remanufacturing, battery recovery, end-of-life

Electrification changes the shape of this picture rather than simplifying it. Removing the tailpipe removes a large share of use-phase emissions, but it increases the relative weight of everything that happens before the vehicle is delivered: battery materials, cell manufacturing, electronics, and the energy behind them.

That shift is one of the main reasons supplier and product-level data has become so important.

Learn more about car sustainability across the automotive value chain →

2. Where Automotive Emissions Come From

Emissions in automotive follow the value chain: materials and suppliers, then manufacturing, then freight, then the product, then the customer.

Carbon accounting sorts those emissions into three scopes.

Scope 1 — direct emissions

Fuel burned on site: natural gas for furnaces and heat treatment, propane for forklifts, diesel for company vehicles, refrigerant leakage.

Scope 2 — purchased energy

Electricity, steam, heating, and cooling bought from a utility. For a machining or stamping operation, this is often the largest single line in the inventory.

Scope 3 — the value chain

Everything else: purchased materials and components, inbound and outbound freight, business travel, commuting, waste, and — for an automaker — the fuel or electricity a sold vehicle consumes over its lifetime.

The GHG Protocol defines Scope 3 as indirect emissions across a company's upstream and downstream value chain, and for purchased goods and services that can include the full cradle-to-gate footprint of everything a company buys. GHG Protocol: Scope 3 FAQ

This is why automotive sustainability is a supply chain problem. For most companies in this industry, the majority of the footprint sits outside their own four walls — which means the company that needs the emissions number is rarely the company that holds the data.

There is also a second question, separate from the corporate inventory: what is the footprint of this specific part? That is a Product Carbon Footprint, and it is increasingly what automotive customers actually ask for.

3. What Automotive Companies Are Doing About Sustainability

Across the industry, sustainability work tends to fall into a recognizable set of categories:

• Corporate carbon accounting — building a Scope 1, 2, and 3 inventory
• Renewable energy — PPAs, on-site solar, green tariffs
• Energy efficiency — compressed air, process heat, lighting, equipment scheduling
• Supply chain decarbonization — working with suppliers on their emissions
• Supplier engagement — data requests, scorecards, questionnaires
• Product Carbon Footprints — part-level emissions data
• Sustainable materials — recycled content, lower-carbon steel and aluminum
• Freight and logistics — mode shift, load efficiency, routing, regional sourcing
• Waste and circularity — scrap reduction, reuse, remanufacturing
• Targets and reduction programs — science-based or customer-driven goals

Most companies do not start all ten at once. The usual sequence is: measure the corporate footprint, find where the emissions actually concentrate, then pick the two or three initiatives that matter for that specific business.

Explore 10 automotive sustainability initiatives →

4. Automotive Sustainability Trends to Watch

A handful of changes are reshaping what suppliers and OEMs will be expected to produce:

• Supplier-specific data is replacing industry averages. Spend-based estimates were acceptable for a first inventory. They are increasingly not acceptable as the basis for a reduction claim.
• Scope 3 is becoming operational. It is moving out of the sustainability report and into procurement decisions, supplier scorecards, and sourcing conversations.
• Product Carbon Footprints are growing quickly. Customers want part-level numbers, not just company-level ones.
• Sustainability is entering procurement. Carbon data is starting to appear alongside price, quality, and delivery in supplier evaluations.
• Supplier reporting is standardizing. Shared questionnaires reduce the number of one-off formats a supplier has to answer.
• PCF exchange is going digital. Catena-X is building interoperable calculation and exchange so a supplier-specific footprint can be reused across tiers instead of recalculated at each one. Catena-X: Product Carbon Footprint
• Pressure is reaching smaller suppliers. Requirements that started at Tier 1 are now arriving at Tier 2 and Tier 3 companies with no sustainability staff.

See the automotive sustainability trends shaping OEMs and suppliers →

5. Solutions for Managing Automotive Sustainability

Knowing where emissions come from is not the same as being able to manage them. Operationally, automotive companies generally need some combination of:

• Carbon accounting — a repeatable Scope 1, 2, and 3 inventory
• Sustainability management — targets, initiatives, and progress tracking in one place
• Supplier data collection — a way to request, chase, and store supplier emissions data
• Product footprint software — BOM-level calculation for parts and components
• Reporting — customer responses, questionnaires, and sustainability reports
• Expert services — people who have done this before, for teams that have not

That last item matters more in automotive than in most industries, because so much of the supply base is made up of companies where sustainability is somebody's fifth priority rather than their job title.

Aclymate covers this as software plus expert services: Navigator for carbon accounting, the Product Footprint Pack for part-level footprints, and Supplier & Scope 3 Data Support for the supplier data work on both sides of the relationship.

Explore sustainable automotive solutions →

6. What Leading Automakers Are Doing

OEM sustainability strategy sets the tempo for everyone below it. Broadly, leading automakers are working on:

• Carbon reduction targets covering operations and, increasingly, the supply chain
• Supply chain programs that push data collection and reduction expectations downstream
• Supplier engagement through scorecards, questionnaires, and development programs
• Product-level emissions data for parts and vehicles
• Sustainable materials, including recycled and lower-carbon metals
• Reporting expectations placed on the supply base

This is also becoming collaborative rather than purely top-down. Suppliers Partnership for the Environment has developed shared carbon reporting and reduction guidance with input from automakers and suppliers across the industry. Suppliers Partnership: supplier carbon guidance

See what leading sustainable car companies are doing →

7. What Sustainability Means for Automotive Suppliers

Here the perspective flips.

A 90-person machine shop never planned to run a sustainability program. Then a major customer asks for Scope 1 and 2 emissions, a footprint for a specific part number, and a completed sustainability questionnaire — with a due date attached to a quote.

At that point sustainability stops being an environmental initiative and becomes a commercial requirement. The request usually lands on whoever has capacity: the quality manager, the EHS lead, the controller, or the owner.

This applies across the supply base:

• Tier 1 system and module suppliers
• Tier 2 component manufacturers
• Tier 3 material processors and specialty shops
• Machine shops and CNC operations
• Tool and die
• Injection molders and plastics processors
• Metal fabrication, stamping, and forming
• Castings, forgings, and heat treatment

The good news is that the first inventory is more tractable than it looks. Utility bills, fuel purchases, and accounting data carry most of what a Scope 1 and 2 footprint needs. The harder part is usually knowing what the customer actually wants and in what format.

Read the automotive supplier sustainability guide →

For suppliers that want help interpreting and answering customer requirements, Aclymate's supply chain sustainability consultants work directly on the request in front of you.

8. Managing Sustainability Across the Supply Chain

Now flip back to the buyer's side.

An OEM or large Tier 1 may purchase from hundreds or thousands of suppliers. Collecting credible emissions data at that scale runs into predictable problems:

• Most suppliers have never calculated a footprint
• Response rates to data requests are low
• Data that does come back is inconsistent in method and boundary
• Missing data has to be filled with estimates
• Spend-based figures cannot distinguish a good supplier from a bad one
• Requirements have to cascade further down than the buyer can see

The practical answer is prioritization rather than universal coverage: concentrate real data collection on the suppliers and materials where emissions actually sit, and accept estimates elsewhere until the program matures.

Learn how to manage automotive supply chain sustainability →

9. Understanding OEM Sustainability Requirements

Customer requirements vary, but they are assembled from a fairly consistent menu:

• A greenhouse gas inventory covering Scope 1 and Scope 2
• Scope 3 information, at least for purchased goods
• Energy and facility data
• Product Carbon Footprints for specific parts
• The Drive Sustainability Sustainability Assessment Questionnaire (SAQ)
• An EcoVadis assessment or scorecard
• An environmental management system, often ISO 14001
• Reduction targets and a credible plan behind them
• Supporting evidence: policies, certificates, calculations, documentation

The SAQ exists specifically to cut down on duplicated effort — it is a shared assessment used across participating automotive companies, with a lighter version aimed at smaller suppliers. Drive Sustainability: SAQ Toolbox

See the guide to OEM sustainability requirements →

10. Automotive Sustainability Reporting

"Reporting" covers four different activities that are easy to confuse:

• Corporate reporting — your Scope 1, 2, and 3 inventory and any public sustainability report
• Supplier reporting — data you send upstream to a specific customer, in their format
• Product reporting — PCFs for individual parts and components
• Assessment reporting — EcoVadis, the SAQ, and customer questionnaires

They draw on overlapping data but have different boundaries, different formats, and different audiences. Treating them as one undifferentiated pile of work is the most common reason suppliers end up rebuilding the same numbers four times a year.

Read the automotive sustainability reporting guide →

11. How Aclymate Helps Automotive Companies and Suppliers

Aclymate is built for the two-sided problem this guide opened with — companies that need supplier data, and suppliers that need to provide it.

• Measure company emissions — Navigator builds a Scope 1, 2, and 3 inventory from the data a business already has.
• Manage supplier data — Supplier & Scope 3 Data Support handles collection, chasing, and organization.
• Calculate product footprints — the Product Footprint Pack connects BOMs, materials, suppliers, and transportation into part-level numbers.
• Respond to customer requirements — a supply chain sustainability consultant works the actual request with you.
• Reduce supply chain emissions — sustainability consulting turns an inventory into a plan.
• Manage the program — Aclymate One keeps targets, initiatives, and reporting in one place.

See how this comes together for the industry on the Automotive & Transportation page.

Where to Start

If a customer request is already on your desk, start by identifying exactly what is being asked for — a corporate inventory, a part-level footprint, or a questionnaire are three different jobs.

If nothing has arrived yet, build the Scope 1 and 2 inventory now. It is the foundation for every other answer, it is the least dependent on anyone else's data, and it is the thing you will wish you had when the first request shows up with a two-week deadline.