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An HGV failing its MOT isn't just a mechanical inconvenience. For an operator licence holder, it can set off a chain of consequences: a prohibition notice on the vehicle, a flag on your OCRS, and potentially a call from DVSA or a letter from the Traffic Commissioner.
If you run a small fleet — scaffolding, groundworks, builders, plant hire — you may not have a full-time Transport Manager watching over these things. That's exactly when a failed MOT can catch you completely off guard.
Here's what you need to understand.
When a goods vehicle over 3.5 tonnes fails its MOT, the implications go beyond the test station. As an operator licence holder, you have made undertakings to the Traffic Commissioner: that your vehicles will be kept in a fit and serviceable condition at all times.
A failed MOT is evidence, on the record, that a vehicle in your fleet did not meet the required standard. DVSA and the Traffic Commissioner treat this seriously, particularly if the failure relates to safety-critical items such as brakes, steering, tyres, or lighting.
An MOT failure on a vehicle still in service before the failure was identified is especially serious. It suggests that your routine maintenance and inspection regime may not be catching defects before they become notifiable.
If an HGV is found to have a serious defect — whether at an MOT test, at the roadside, or during a DVSA inspection — an examiner can issue a PG9 prohibition notice. This notice makes it illegal to move the vehicle until the defect has been repaired and the prohibition has been lifted.
There are two types of PG9:
⚠️ Moving a prohibited vehicle without authority is a criminal offence. Do not drive a PG9'd vehicle until the prohibition has been formally lifted by a DVSA examiner.
Once repaired, the vehicle must be presented for a DVSA inspection to have the prohibition lifted. This is not automatic — you need to book it and have the vehicle pass the re-inspection.
DVSA records all MOT outcomes and prohibition notices against your operator licence number. This data feeds directly into your Operator Compliance Risk Score (OCRS). A failed MOT — particularly with dangerous or major defects — will increase your OCRS risk rating.
A higher OCRS score makes it more likely that:
DVSA may also contact you directly to understand why the vehicle was presented for its MOT in a condition that led to failure — and what you're doing to prevent it happening again.
The Traffic Commissioner becomes involved when DVSA refers a case, or when evidence suggests an operator is not meeting their licence undertakings. A pattern of failed MOTs, PG9 prohibitions, or high OCRS scores can trigger a call-up to a Public Inquiry.
At a Public Inquiry, the Traffic Commissioner can:
For a small operator who depends on their vehicles to trade, revocation is a business-ending outcome. The Traffic Commissioner has full authority to impose it, and DVSA evidence of repeated or serious vehicle failures is taken very seriously at Public Inquiries.
⚠️ A single serious failure does not automatically lead to revocation. But a pattern — or a failure combined with poor maintenance records — changes that picture significantly.
Do not use the vehicle until it has been repaired and, if a PG9 has been issued, the prohibition has been formally lifted. The short-term operational disruption is far less serious than the consequences of operating a prohibited vehicle.
Book the repair with a competent repairer as soon as possible. Keep the invoice, the defect report, and the follow-up inspection records. This paperwork is evidence that you acted promptly and responsibly.
If your vehicle failed on brakes, tyres, or any safety-critical item, ask yourself: when was the last PMI? What did it record? Was the defect present and missed, or did it develop quickly? Your answer matters because DVSA or the Traffic Commissioner may ask the same question.
Periodic Maintenance Inspections (PMIs) exist precisely to catch defects before they become failures. If your PMI intervals are too long, or if your maintenance provider isn't flagging developing faults, the MOT failure is a symptom of a deeper problem.
Record the failure, the defect, the repair date, and the outcome of the re-test. If DVSA contacts you later, you want a clean, complete paper trail that shows you took the failure seriously.
This is where a lot of small operators find themselves in difficulty. The MOT failure is visible. DVSA can see it. But the real question — the one that determines whether this stays as a one-off or escalates — is whether you have a credible maintenance system behind it.
If your PMI records are incomplete, your walkaround check books are missing, or your inspection intervals aren't documented, a single failed MOT becomes evidence of systemic non-compliance. That's a very different conversation to have with DVSA or the Traffic Commissioner.
💡 The time to sort your compliance records is before DVSA asks for them — not after. A proper compliance monitoring system means you always know where your vehicles stand, and you can demonstrate it in writing.
Important: We do not act as your Transport Manager. Fleetguard Compliance provides compliance monitoring support and alerts — we help you stay on top of your obligations. Legal responsibility for your vehicles and drivers remains with you as the operator licence holder.
Fleetguard Compliance monitors your vehicle maintenance dates, PMI schedules, MOTs, and driver records — and alerts you before anything goes overdue. One less thing to worry about. One fewer reason for DVSA to call.
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