How to Improve Your OAMI Score Without Replacing Equipment
Improving a GM Overall Automation Maturity Index (OAMI) score does not necessarily require replacing existing production equipment. For many automotive suppliers, the greater opportunity lies in making current equipment more connected, measurable, integrated, and responsive.
A machine can be automated and still contribute to a relatively immature manufacturing environment if its production data remains isolated from the rest of the plant. By contrast, brownfield equipment can support a more mature operation when machine data flows into manufacturing systems, production events trigger action, traceability is electronic, and processes are standardized across lines and facilities.
GM has not publicly released the complete OAMI scoring methodology or a standardized supplier checklist. However, reporting around the program indicates that OAMI evaluates automation maturity across the production process, while GM's own automation-maturity hiring materials reference supplier baseline capability, future-state capability, improvement plans, timing, and supporting evidence.
For suppliers, that makes improving OAMI less about asking, "What equipment should we replace?" and more about asking, "Where does data stop flowing, where does manual work remain, and what prevents our existing automation from operating as one connected system?"
TL;DR
GM has not publicly released the detailed criteria used to calculate an OAMI score.
A machine can be automated and still operate as a maturity liability if its production data is isolated from the rest of the plant. Brownfield manufacturing equipment can often be connected without replacement through sensors, edge gateways, protocol translation, and manufacturing software.
MES, WMS, QMS, and maintenance systems can use production data from existing equipment to support real-time visibility, traceability, downtime analysis, and workflow automation.
Existing GM supplier requirements already address electronic traceability, proactive maintenance, EDI, and logistics processes that depend on connected manufacturing data.
Any OAMI checklist based on public information should be treated as a readiness tool rather than an official GM scoring checklist.
How GM OAMI Evaluates Supplier Automation Maturity
General Motors' Overall Automation Maturity Index is used to evaluate the automation maturity of supplier manufacturing operations. Public reporting indicates that the assessment covers the production process from incoming materials through manufacturing and final shipment.
Suppliers complete a self-assessment, and GM may conduct on-site evaluations to validate reported capabilities against actual plant operations.
GM has not publicly released the complete OAMI scoring methodology, detailed assessment criteria, or an official supplier checklist.
How Suppliers Can Raise an OAMI Score
A supplier can improve its overall automation maturity by increasing the connectivity, integration, visibility, and responsiveness of its existing manufacturing operations. Because GM has not published the detailed OAMI scoring methodology, individual projects cannot be guaranteed a score increase.
A practical improvement program could focus on several areas.
Connect Production Equipment
Determine which machines, PLCs, automated cells, and processes still rely on manual data collection or operate independently from plant-level systems. Existing equipment can often be connected using sensors, edge gateways, industrial protocols, and middleware.
Contextualize Production Data
Machine signals become substantially more useful when they can be associated with the work order, part, material lot, operator, shift, quality result, and production step involved.
Integrate Manufacturing Systems
MES, ERP, warehouse, quality, and maintenance systems should exchange information without employees repeatedly re-entering data or reconciling spreadsheets.
Turn Information Into Action
Higher manufacturing maturity is not simply having more dashboards. Downtime, quality, inventory, and production events should trigger alerts, maintenance workflows, containment actions, or other defined responses.
Standardize What Works
A solution that works on one machine but has to be rebuilt from scratch at every facility is difficult to scale. Suppliers should establish common data models, naming standards, workflows, and integration patterns that can be reused across plants.
This is also why buying additional automated machinery may not solve the underlying problem. A new production cell that remains disconnected from MES, maintenance, quality, and enterprise systems can create another automation island rather than improving overall manufacturing maturity.
Retrofitting Brownfield Lines for OAMI
Brownfield automotive plants can add automation and digital connectivity around existing equipment without replacing the underlying machinery. Older PLCs, SCADA systems, and production assets can often continue performing their original control functions while additional technologies make their operating data available to modern manufacturing systems.
Sensors can be added to capture information such as machine state, vibration, temperature, pressure, power consumption, or current draw. Edge gateways can collect that data and translate information from legacy industrial protocols into formats that newer software can use.
This allows a brownfield machine that previously operated in isolation to contribute data to production monitoring, maintenance, quality, traceability, or reporting systems. The physical equipment does not necessarily change; the difference is that its operating data becomes available outside the machine or production cell.
For automotive suppliers working toward OEM requirements, this type of connectivity can also support electronic traceability, equipment performance monitoring, production reporting, and logistics processes that are already part of GM supplier requirements.
What GM Already Requires From Suppliers
Several existing GM supplier requirements depend on connected manufacturing data and digital process records, providing concrete examples of capabilities GM already expects suppliers to maintain. Although these requirements sit outside the OAMI framework, suppliers who already meet them have built much of the digital infrastructure that automation maturity assessments reward.
Electronic Traceability
GM's Supplier Quality Statement of Requirements includes provisions for documented traceability planning and electronically available traceability data. These requirements include the ability to connect final assembly manufacturing information with relevant component manufacturing dates or lot codes. Certain high-severity failure modes also require traceability from the component through to the final assembly.
Electronic traceability depends on production, material, and quality information being associated with the manufactured product. In a connected environment, those records can be retrieved electronically rather than reconstructed from paper records or disconnected spreadsheets.
Maintenance and Downtime Requirements
GM’s Built-In Quality Supply Base framework requires proactive maintenance methods to reduce unplanned downtime, speed loss, equipment failure, and defects. Connected equipment data is how suppliers meet and evidence those requirements.
Connected equipment data can support these requirements by creating a digital record of downtime, equipment performance, and maintenance activity. Real-time monitoring can capture when production stops, how long the interruption lasts, and which asset or process is affected. Preventive or predictive maintenance systems can then use this information, along with equipment-condition data, to identify recurring failures or changes in machine performance.
Overall Equipment Effectiveness (OEE) is one way manufacturers quantify these losses. OEE combines availability, performance, and quality, making downtime one of the measurable factors affecting overall equipment effectiveness.
Shipment and EDI Requirements
GM suppliers also use electronic data interchange for logistics and shipment communication. This includes electronic messages related to scheduling, advance ship notices, dispatch information, receiving, and other supply-chain transactions. GM's EDIFACT guidance notes that problems with compliant shipment messages can result in additional manual receiving activity at GM facilities.
These requirements demonstrate that supplier digital maturity extends beyond production machinery itself. Traceability, maintenance, material movement, and shipment processes also depend on connected data and reliable electronic records.
Maintaining OAMI Readiness Over Time
Maintaining OAMI readiness means keeping connected systems, the evidence they generate, and the documentation of their capabilities aligned with how the plant actually operates, not how it was originally designed. Automation maturity shifts as equipment, software, production processes, and plant architectures change.
System integrations need to continue functioning as machines and applications change. Traceability records need to remain retrievable, equipment-performance data needs to remain consistent, and production information needs to use standardized definitions across lines and facilities. Supporting evidence also needs to reflect how the plant actually operates rather than how the system was originally designed.
These practices do not represent an official GM formula for maintaining a high OAMI score. They reflect the ongoing operational requirements of maintaining connected manufacturing systems and the types of evidence referenced in GM's automation-maturity materials.
Frequently Asked Questions
Is GM OAMI mandatory for suppliers?
GM has publicly described its OAMI metrics as goals rather than requirements, and there is no publicly stated universal deadline for suppliers to reach a specific score. However, supplier executives cited in industry reporting have indicated that automation maturity may influence future sourcing decisions. Because GM has not published a formal compliance mandate, suppliers should distinguish between reported sourcing expectations and official requirements.
What OAMI score does GM expect from suppliers?
Industry reporting has cited a target of approximately 4.5 out of 5, but GM has not publicly confirmed that figure as a mandatory supplier threshold. GM has also not published a detailed scoring rubric that shows exactly which capabilities are required for each score.
Is there an OAMI assessment checklist for GM suppliers?
GM has not publicly released an official OAMI compliance checklist or supplier automation score checklist. The following should therefore be treated as a readiness checklist based on publicly reported OAMI information, GM automation-maturity hiring materials, and existing GM supplier requirements rather than as GM's official scoring rubric.
Before an OAMI assessment, suppliers can review whether their current manufacturing environment can demonstrate the following:
Production equipment provides digital operating data where applicable.
Machine data can be associated with production context, such as the work order, part, material lot, shift, or quality result.
Production, ERP, quality, warehouse, and maintenance systems can exchange information without repeated manual data entry.
Downtime, production output, quality, and equipment-performance data are available electronically.
Required product genealogy and traceability information can be retrieved electronically.
Preventive or predictive maintenance activity is documented, and equipment performance is measured.
Receiving, inventory movement, production supply, and shipping transactions are digitally recorded where required.
Required EDI and shipment communications are transmitted electronically.
Current automation capabilities can be supported with system-generated evidence.
Baseline capability, future-state capability, improvement plans, timing, and supporting evidence are documented where applicable.
How Fuuz Supports OAMI Readiness
Fuuz provides a unified industrial platform that connects machines, systems, people, and data within a single operational layer. The platform can connect sensors and PLCs, production equipment, operational teams, ERP and other enterprise systems, historians, databases, data lakes, and APIs, giving manufacturers a governed source of operational data across the plant.
Fuuz also provides coordinated manufacturing capabilities for production execution, warehouse management, quality, maintenance, connected-worker applications, and industrial data operations. Because these capabilities operate within the same platform, production information can be used across functions such as real-time monitoring, downtime analysis, OEE, traceability, maintenance, inventory movement, quality management, and operational reporting rather than remaining isolated in separate systems.
For brownfield manufacturers, this creates a way to extend the digital capabilities of existing production equipment without rebuilding the entire manufacturing environment. Fuuz’s industrial data operations layer can collect and contextualize data from machines and systems, visualize it in real time, identify patterns, and use business logic to trigger workflows and automation.
Contact Fuuz to learn how we can help connect existing equipment and support your OAMI readiness efforts.