Auto & Truck Parts Industry Terminology

Aftermarket

The secondary market for vehicle parts, accessories, and services sold after the original sale, including replacement, performance, and appearance items, distinct from OEM-installed parts.

APQP (Advanced Product Quality Planning)

An automotive framework for planning and controlling product quality from concept through launch, culminating in PPAP submission.

ASIL (Automotive Safety Integrity Level)

Risk classification (A–D) in ISO 26262 that sets rigor for safety goals and development processes for electrical/electronic systems.

ASPICE (Automotive SPICE)

A process capability model for evaluating and improving automotive software and systems engineering processes (levels 0–5).

Bill of Materials (BOM)

The structured list of parts, subassemblies, quantities, and references needed to build a product; may be engineering or manufacturing BOM.

CAFE (Corporate Average Fuel Economy)

U.S. regulations governing the average fuel economy of an automaker’s fleet; influences lightweighting, powertrain mix, and aerodynamics.

CAN bus (Controller Area Network)

A robust in-vehicle network standard enabling microcontrollers and devices to communicate without a host computer.

CapEx (Capital Expenditure)

Funds used to acquire or upgrade physical assets like tooling, machinery, or warehouses; typically depreciated.

CARB Executive Order (CARB EO)

Certification from the California Air Resources Board allowing sale of emissions-related aftermarket parts in California.

COGS (Cost of Goods Sold)

Direct costs attributable to producing goods sold, including materials, direct labor, and freight-in.

Core charge

A refundable fee added to remanufactured parts to incentivize return of the used core for rebuilding.

Core return

The process of sending back used parts (cores) to be remanufactured; governed by acceptance criteria and timing.

D2C (Direct-to-Consumer)

Selling parts directly to end users via owned e-commerce or retail, bypassing distributors.

Design for Manufacturability/Assembly (DFM/DFA)

Engineering practices that simplify production and assembly to reduce cost, time, and defects.

DV/PV (Design Validation/Product Validation)

Testing phases: DV verifies design meets requirements; PV validates the production process and product in final form.

E-commerce marketplace

Third-party platforms (e.g., Amazon, eBay) where parts are listed and sold, often with their own fees and policies.

EDI (Electronic Data Interchange)

Standardized electronic exchange of business documents (POs, ASNs, invoices) between trading partners.

End-of-Line (EOL) testing

Final functional testing at the end of a production line to verify product performance before shipment.

EPA emissions compliance

Conformance with U.S. Environmental Protection Agency regulations governing emissions and related components.

FMEA (Failure Modes and Effects Analysis)

A structured method to identify potential failures, assess risk, and prioritize mitigations in design or process.

FIFO (First-In, First-Out)

Inventory rotation method where the oldest stock is used or shipped first to prevent obsolescence.

Fitment

The set of vehicles with which a part is compatible; often expressed by year/make/model/engine.

Gross margin

Revenue minus COGS, typically expressed as a percentage; key measure of product profitability.

IATF 16949

The global automotive quality management standard applicable to production and service parts organizations.

ICE (Internal Combustion Engine)

Vehicles powered by gasoline or diesel engines; contrasted with hybrid and EV platforms.

IMDS (International Material Data System)

Industry system for reporting material composition and substances in automotive parts for compliance.

Inventory turnover

A ratio of COGS to average inventory; indicates how often inventory is sold and replaced.

JIT (Just-in-Time)

A production and inventory strategy that supplies parts exactly when needed to reduce inventory and waste.

Kanban

A visual pull system using cards/bins to signal replenishment based on actual consumption.

KPI (Key Performance Indicator)

Quantifiable metrics that track performance against objectives (e.g., fill rate, OTD, PPM).

Lead time

Elapsed time from order placement to delivery, including production and transit.

LTL (Less-than-Truckload)

Freight mode for shipments that do not require a full trailer; priced by class, weight, and distance.

Lot traceability

Ability to trace materials and finished goods by batch/lot through production and distribution.

MAP pricing (Minimum Advertised Price)

Policy setting the lowest price a reseller can advertise to protect brand value and margins.

MOQ (Minimum Order Quantity)

The smallest quantity a supplier will sell per order, often to optimize setup and economics.

MRP (Material Requirements Planning)

System-driven planning that calculates material needs and schedules based on demand, BOMs, and inventory.

MSRP (Manufacturer’s Suggested Retail Price)

The baseline retail price recommended by the manufacturer; resellers may discount from it.

NHTSA recall

A mandated U.S. safety recall process overseen by the National Highway Traffic Safety Administration.

NPI (New Product Introduction)

Cross-functional process that takes a product from concept to market, including design, sourcing, and launch.

NVH (Noise, Vibration, Harshness)

Measures and perceptions of noise and vibration performance; critical for comfort and quality.

OEM (Original Equipment Manufacturer)

The vehicle maker; also refers to OEM-supplied parts installed in production.

OES (Original Equipment Supplier)

A supplier that provides service parts to an OEM’s dealer network under the OEM brand.

OTD (On-Time Delivery)

The percentage of orders delivered by the promised date; core service-level metric.

PPAP (Production Part Approval Process)

Formal submission package that proves a supplier can produce parts that meet requirements at rate.

PPM (Parts Per Million defects)

Quality metric indicating the number of defective parts per million shipped.

Private label

Products manufactured by one company and sold under another company’s brand, often for retailers.

Remanufacturing

Industrial process of refurbishing used components to like-new condition with warranties comparable to new.

Reverse logistics

Processes for moving goods from customers back to the company for returns, repairs, recycling, or core recovery.

SKU (Stock Keeping Unit)

A unique identifier for a distinct item in inventory, used for tracking and planning.

SPC (Statistical Process Control)

Use of statistical methods and control charts to monitor and control manufacturing processes.