VMRS Codes
Vehicle Maintenance Reporting Standards codes — a standardized numeric coding system for classifying vehicle components and repair work, used to track maintenance costs by system, improve fleet data consistency, and benchmark repair trends.
Category: Fleet MaintenanceOpen Fleet Maintenance SoftwarePublished June 10, 2026Updated August 18, 2026
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Compare Fleet Maintenance Software software →How the VMRS Coding System Is Structured
VMRS was developed by the American Trucking Associations (ATA) in the 1970s and has become the de facto standard for fleet maintenance data classification. The system uses a hierarchical numeric structure: System Codes (two digits, e.g., 013 for Fuel System), Assembly Codes (three digits identifying sub-assemblies), and Component Codes (three more digits identifying specific parts). A full VMRS code string looks like 013-001-005, pointing from system to assembly to component. When every work order uses consistent VMRS codes, a fleet can instantly run reports answering questions like: what percentage of total maintenance spend goes to braking system repairs, which vehicle model has the highest transmission failure rate, or which vendor has the worst parts quality rate.
Most-Referenced VMRS System Codes in Commercial Fleets
Commonly used VMRS System Codes for Class 6–8 trucks
| VMRS System Code | System Name | Typical Spend % |
|---|---|---|
| 001 | Cab & Sheet Metal | 3–5% |
| 002 | Accessories | 2–4% |
| 011 | Air Intake | 1–3% |
| 013 | Fuel System | 5–8% |
| 021 | Engine — General | 10–18% |
| 023 | Engine Cooling | 3–6% |
| 031 | Power Transmission | 8–14% |
| 042 | Brakes | 10–16% |
| 050 | Steering | 3–6% |
| 054 | Tires & Wheels | 8–14% |
| 065 | Electrical | 6–10% |
| 097 | Preventive Maintenance | 12–20% |
Why VMRS Codes Make or Break Fleet Data Quality
Without VMRS codes, a fleet's maintenance records are a collection of free-text technician notes that cannot be analyzed at scale. A work order that says 'fixed the brake thing on truck 44' tells you almost nothing about trends. The same repair tagged with VMRS 042-001-003 (Brakes — Service Brakes — Brake Lining) connects to every other brake lining replacement across the fleet, enabling analysis of lining life by route type, vehicle model, and driver. Fleets that implement VMRS properly can identify that a specific tractor model burns through brake linings 40% faster than others on the same routes — a finding worth tens of thousands of dollars in targeted PM adjustment.
VMRS in Practice: A Real Coding Workflow
A 120-truck LTL carrier standardized VMRS coding across its two maintenance shops after noticing its cost-per-mile data was inconsistent between locations. Technicians were required to select a VMRS system code, assembly code, and reason-for-repair code on every work order in their fleet management system before closing it. Within six months, the maintenance director identified that their Freightliner Cascadia tractors had a 3x higher air dryer failure rate than their Kenworths on the same lanes — a variance invisible in unstructured data. By replacing air dryers proactively at 200,000 miles on the Cascadias, they eliminated 11 roadside breakdowns in the following year.
Reason-for-Repair Codes: The Other Half of VMRS
VMRS also includes Reason-for-Repair (RFR) codes that classify why work was done: scheduled PM, driver-reported complaint, roadside inspection finding, warranty, accident damage, and others. Tracking RFR codes alongside component codes lets fleet managers separate scheduled maintenance spend from reactive repair spend — a critical distinction when evaluating whether a PM program is actually preventing failures or just running alongside them without impact.
- Require technicians to enter a VMRS system code and assembly code on every work order before closing
- Add Reason-for-Repair (RFR) codes to understand whether repairs are scheduled, reactive, or driver-reported
- Run a monthly VMRS spend report by system code to identify which vehicle systems are consuming disproportionate maintenance budget
- Use VMRS data to compare maintenance cost profiles across vehicle makes and models
- Share VMRS-coded data with your fleet management software vendor for industry benchmarking where available
- Train new technicians on VMRS coding as part of onboarding — code quality degrades when coding is treated as optional
- Audit 10% of closed work orders monthly to verify VMRS codes are accurate and not defaulting to a catch-all code
VMRS Codes FAQ
Quick answers to the questions buyers usually ask once the category, software, or rollout details start getting more specific.
A
Any serious fleet maintenance platform — Dossier, TMT Fleet Maintenance, Fleetio, AssetWorks — supports VMRS coding natively. If your current system does not support VMRS, that is a strong signal you have outgrown it. VMRS compliance is a minimum capability requirement for mid-size and large fleets.
A
The ATA publishes the official VMRS code set. Many fleet management platforms include the full VMRS library pre-loaded. The ATA Technology & Maintenance Council (TMC) is the standards body that maintains and updates the code set.
A
Yes. VMRS includes trailer-specific system codes (e.g., trailer landing gear, cargo securement systems, refrigeration units) and is applicable to any commercial vehicle type including buses, construction equipment, and specialized vocational units.