PMI Inspection Support

What is a PMI inspection?

A PMI inspection is a Preventative Maintenance Inspection. It is the planned workshop inspection used to check that an HGV or PSV remains roadworthy between annual tests. Unlike a daily walk round check, a PMI is a detailed examination carried out to a documented standard, with findings recorded and any defects repaired before the vehicle returns to service.

PMI inspections are normally completed by a competent technician in your own workshop or by an external maintenance provider. The inspection should follow a consistent checklist so every vehicle is assessed against the same standard each time. If faults are found, the inspection is only part of the job. The defects must be rectified, signed off and the records kept as evidence.

The expectation for regular PMI inspection comes from the commitments made under an operator’s licence and the guidance set out in the Guide to Maintaining Roadworthiness. Operators undertake to keep vehicles and trailers fit and serviceable at all times. A properly managed PMI system is one of the main ways that commitment is demonstrated if the Traffic Commissioner or DVSA asks for evidence.

PMI intervals

The right PMI interval depends on how a vehicle is used. Many operators work to a six week cycle because it suits general haulage and provides a sensible balance between workshop time and vehicle availability. That does not mean six weeks is a legal requirement for every fleet.

Older vehicles, high mileage operations, heavy construction work, intensive urban delivery and demanding duty cycles often justify shorter intervals. Newer vehicles covering modest annual mileage on lighter work may be suitable for a longer period, provided that remains appropriate for their condition and use.

PMI inspection intervals should be reviewed whenever operating conditions change. A vehicle that starts covering significantly more mileage, works on rough sites or develops recurring defects may need bringing into the workshop more frequently.

The planned inspection interval forms part of the maintenance arrangements declared for the operator’s licence. Once that schedule is established, inspections should be completed on time and the maintenance planner should clearly show what has been carried out and when.

What a PMI covers

A PMI inspection is far more detailed than a driver’s daily check. The exact format varies slightly between maintenance providers, but the inspection normally includes the following areas.

• Brakes, including brake performance testing and recording the results.
• Steering components, steering box, linkages and operation.
• Suspension, axles and associated mountings.
• Tyres and wheels, including condition, wear, damage and security.
• Lights, reflectors, electrical equipment and warning devices.
• Body, chassis, couplings, underbody condition and structural integrity.
• Driver controls, instruments, mirrors, wipers and other safety equipment.

Inspection methods should reflect the current inspection and maintenance standards expected by DVSA. A completed checklist has little value unless it accurately records what was inspected, what was found and what action was taken afterwards.

PMI records and evidence

Good paperwork matters because it demonstrates that maintenance has actually been carried out. PMI inspection records should normally be retained for at least 15 months and be easy to produce if requested during an investigation, audit or roadside enquiry.

Each inspection record should identify the vehicle, inspection date, mileage where appropriate, the technician carrying out the work and any defects identified. Rectification should be clearly recorded, together with confirmation that repairs have been completed before the vehicle returns to service where required.

Brake testing has become an increasingly important part of maintenance evidence. The expectation is that every PMI is supported by brake performance evidence, using a suitable brake tester wherever practical or another acceptable method where justified and recorded.

Electronic maintenance systems are widely used and can work very well. Paper records remain perfectly acceptable if they are complete, legible and properly organised. The important point is that the information is accurate, secure and readily available when requested.

The transport manager’s job around PMIs

A transport manager should know exactly when every vehicle is due for inspection and make sure workshop bookings are planned well in advance. Leaving PMIs until the last minute usually leads to missed dates, rushed inspections or vehicles being taken off the road unexpectedly.

Before a vehicle enters service for the first time, maintenance arrangements should already be in place. The inspection schedule should begin from first use and continue throughout the vehicle’s operating life, with trailers managed to the same standard.

Reviewing completed PMI inspection sheets is just as important as filing them. Repeated defects, inconsistent inspection quality or poor repair standards should be challenged. Regular review helps identify trends, confirms that maintenance providers are delivering the agreed standard and gives confidence that vehicles remain fit for service.

PMI inspections sit at the heart of operator licence compliance for any vehicle operator. Getting them done is the minimum. The question regulators, auditors and Traffic Commissioners are actually asking is whether the inspections are finding defects, those defects are being rectified promptly, the evidence is retained properly, and someone in management is actually looking at what the records show.

A completed inspection sheet filed in a folder is not, by itself, evidence of effective maintenance management. It is a starting point.

What makes a PMI system genuinely compliant

DVSA examiners reviewing an operation will look at the whole picture, not just whether inspections happened. They want to understand the interval and whether it is justified for the vehicles and operating conditions. They want to see brake testing evidence alongside the inspection records. They want defect reports that show reported issues were investigated and repaired, with the paperwork to prove it. And they want to see that someone, typically the nominated Transport Manager or a senior manager, is reviewing the information rather than simply filing it.

The Guide to Maintaining Roadworthiness published by DVSA on GOV.UK is the reference point for all of this: Guide to Maintaining Roadworthiness.

Intervals are not set and forget

PMI intervals must remain appropriate for the vehicle’s age, mileage, type and the nature of the operation. A six-weekly interval that was fine when a vehicle was newer may not be adequate later in its life. The same goes for tippers, tankers, vehicles used on harsh routes, or any type of vehicle exposed to above-average wear. The operator should be able to explain and justify the chosen interval, not just point to a supplier’s standard schedule.

We see this as a common weakness, particularly where operators have been using the same maintenance contractor for years and the inspection frequency has never been reviewed against actual vehicle usage.

Common gaps in PMI management

A specialist review will typically examine:

• Whether the current inspection intervals are appropriate for the fleet and usage.
• Consistency and quality of inspection sheets, not just whether they exist.
• Defect reporting and rectification procedures, and whether there is a clear audit trail.
• Brake testing evidence and how it links to the overall maintenance programme.
• Roles between the transport office, maintenance provider and drivers.
• Whether records accurately reflect what is happening at the operating centre.
• Whether the Transport Manager is reviewing and acting on maintenance information.

The most common problems we come across are: inspections carried out on time but with defects not properly documented; brake testing done inconsistently or not loaded where it should be; defects reported by drivers but not followed through to repair sign-off; and maintenance records held by the contractor but not by the operator. Each of those can create difficulties if the records are reviewed under regulatory scrutiny.

When PMI inspection support is most useful

After changing maintenance providers is an obvious trigger, since new arrangements often need time to bed in and early independent review can catch issues before they become embedded. Support is also commonly requested when preparing for a compliance audit, responding to DVSA concerns, reviewing a poor OCRS score, or checking whether existing evidence would withstand examination.

It is also worth doing when responsibility for compliance has recently changed within the business. A new Transport Manager, a new fleet manager, a restructure. These transitions often reveal gaps in the documentation chain that nobody was aware of before.

Making an enquiry

Before requesting support, it helps to have your operator licence type, number of vehicles and trailers, operating centre location, current PMI intervals and maintenance provider details to hand. If there have been recent DVSA contacts, prohibitions, MOT failures or customer audit concerns, include those too. Copies of recent inspection sheets, defect records, brake test printouts and any correspondence from the Traffic Commissioner or DVSA are all useful.

The more specific you can be about what prompted the review, the more focused and practical the response will be.

Frequently Asked Questions

What does PMI stand for?

PMI stands for Preventative Maintenance Inspection. It is the planned workshop inspection used to assess the roadworthiness and mechanical condition of an HGV or PSV between annual tests. The inspection is recorded, defects are repaired and the completed paperwork becomes part of the vehicle’s maintenance history.

Is a 6 weekly PMI a legal requirement?

No. Six weeks is a common maintenance interval used by many operators, but it is not a fixed legal rule. The correct interval depends on factors such as vehicle age, mileage, operating conditions and reliability. The maintenance schedule declared on the operator’s licence should match how the fleet is actually used.

Can a driver do the PMI?

A driver should complete daily walk round checks before using the vehicle, but that is not the same as a PMI inspection. A PMI is normally carried out by a competent workshop technician using a documented inspection process, with defects recorded and rectified before the vehicle returns to service if necessary.

What happens if you miss a PMI?

Missing a scheduled PMI creates a gap in your maintenance programme and can become a serious issue if identified by DVSA or the Traffic Commissioner. It may raise questions about roadworthiness, maintenance control and compliance. If an inspection is missed, the circumstances and any action taken should be clearly documented.