PMI Safety Inspections: The Complete Guide for UK HGV Operators

What Is a PMI?

A Preventive Maintenance Inspection (PMI), sometimes called a safety inspection, is the scheduled, documented inspection every commercial vehicle on a UK O-licence must undergo at fixed intervals. It is the bedrock of your maintenance system and the single document a DVSA examiner will ask to see first when they visit.

PMIs are separate from — and in addition to — daily walkaround checks and MOT tests.

Legal Basis

PMIs are required under your operator's licence undertakings, specifically:

> "I/we will keep all vehicles fit and serviceable, and proper records of all inspections and rectification work will be kept for 15 months."

The DVSA's Guide to Maintaining Roadworthiness is the authoritative reference for what a compliant PMI looks like.

How Often Should PMIs Be Done?

There is no single legal interval — the DVSA expects intervals proportionate to use. Typical UK industry practice:

Whatever interval you choose, two rules apply:

1. Document the rationale. Your maintenance plan should explain why you picked that interval (e.g. "6 weeks based on average annual mileage of 80,000 km and on-road duty").
2. Stick to it. Repeated late inspections without good reason will be a red flag at audit.

What a PMI Must Cover

The DVSA's industry-standard HGV Inspection Manual lists ≈ 90 items. The categories are:

Statutory items (every PMI)

• Brakes — service, parking, secondary, ABS warning
• Steering — play, alignment, power steering operation
• Tyres and wheels — condition, fixings, pressures
• Suspension — springs, dampers, air system
• Lights and indicators — all functions
• Windscreen and wipers
• Seats and seatbelts
• Mirrors, view-mirrors, camera systems
• Coupling (artics) — fifth wheel inspection
• Body and chassis
• Exhaust and emissions
• Fuel and AdBlue systems
• Driver controls and warning systems
• Speed limiter
• Tachograph (calibration sticker date)

Brake performance test

A roller brake test (RBT) or decelerometer test is expected at every PMI. Service brake efficiency ≥ 50%, parking brake ≥ 16% (for most HGVs). Imbalance must be within tolerance.

Documentation check

• MOT certificate validity
• Insurance
• Operator licence disc displayed
• Tax (VED)
• Tachograph calibration sticker
• Speed limiter plate

Sign-Off Requirements

Every PMI sheet must show:

1. Vehicle identifier (registration + VIN or fleet number)
2. Date and odometer reading
3. Inspector's name and signature (electronic signatures are accepted)
4. Pass / fail / rectification required for each item
5. Defect details for any failed item
6. Rectification record — what was done, by whom, when
7. Final declaration that the vehicle is safe to return to service (or held off road)

The PMI sheet on its own is not enough. You also need the rectification work record (job card) tied to it. The two together are what the DVSA wants to see.

Brake Testing: The Detail That Trips Operators Up

The Guide to Maintaining Roadworthiness expects a laden brake test where reasonably practicable, ideally at every PMI and certainly at intervals no greater than 13 weeks. "Reasonably practicable" is interpreted loosely by some operators — the DVSA increasingly is not.

If you can't do a laden RBT, document why and show what alternative method you use.

Record Retention

15 months minimum for:

• PMI sheets
• Rectification records
• Brake test printouts
• Driver defect reports

Most operators keep records longer. A digital system makes retention a non-issue.

How Zohti Handles PMI Compliance

Zohti was built around the PMI → defect → rectification cycle:

• Per-vehicle PMI scheduler with custom intervals and email alerts before the due date
• Configurable PMI templates matching the DVSA HGV Inspection Manual
• Brake test attachment — upload the RBT printout against the inspection
• Defect tickets auto-created from failed items, routed to the workshop
• Rectification sign-off with photos and inspector ID
• 15-month retention built in
• Audit export — every PMI, defect and rectification record for any vehicle in seconds

Common Audit Findings (Avoid These)

In our work with UK operators, the most common DVSA audit findings on PMIs are:

1. Late inspections with no documented reason
2. PMI sheet present, rectification record missing (the DVSA assumes the work wasn't done)
3. Defects ticked "rectified" with no evidence of who did the work or when
4. No brake performance test, or only at MOT
5. Inspector qualifications not documented
6. PMI templates that don't match the vehicle type (e.g. HGV template used for a coach)

Fixing these doesn't require new technology. It requires discipline. But a digital system makes the discipline almost automatic.

Get Started

If you're still running PMIs on paper or a spreadsheet, start a free 14-day trial of Zohti. We'll set up your PMI schedule and templates and have your next inspection logged digitally.