Fleet vehicle maintenance: the alerts that prevent breakdowns, MOT failures and lease return charges

Good fleet vehicle maintenance comes down to one thing: knowing before the car does that a service, an MOT, a tyre or a 12V battery is due. In the UK the employer carries the legal risk under health and safety law, for company cars and for the staff's own cars used on business, and an MOT certificate alone does not prove a vehicle is safe.

This guide sets out what the law expects, the alerts worth tracking on petrol, hybrid and electric cars, who pays what under contract hire, how BVRLA fair wear and tear works at lease return, and what a missed alert costs on a 50-car fleet, in pounds. It also shows how connected car data, such as the box-free telematics Voltaback reads from the vehicle, turns those alerts into a weekly to-do list without tracking anyone's location.

What does the law require from an employer on fleet maintenance?

There is no single "fleet maintenance act" for cars and light vans. The duty comes from general health and safety law, applied to the road.

Health and Safety at Work etc. Act 1974

The Health and Safety at Work etc. Act 1974 requires employers to ensure, so far as is reasonably practicable, the health and safety of employees and of others affected by their work. The Health and Safety Executive (HSE) is explicit: health and safety law applies to work activities on the road in the same way as on a fixed site.

In practice, HSE expects employers to:

• carry out a risk assessment covering the journey, the driver and the vehicle;
• make sure workers carry out and record daily vehicle checks;
• carry out planned and preventive maintenance in line with the manufacturer's recommendations;
• inspect tyres and wipers regularly and replace them when needed;
• have a procedure for reporting defects, and remedy defects promptly;
• set a clear rule that unsafe vehicles must not be driven;
• make drivers aware of the specific hazards of electric and hybrid vehicles, such as battery fire risk after a collision.

HSE adds a line every fleet manager should quote in their policy: an MOT certificate only covers basic defects and does not guarantee that a vehicle is safe.

Source: HSE, Make sure vehicles used to drive or ride for work are safe.

Grey fleet: the same duty

The law applies to company vehicles and to grey fleet, meaning cars owned by employees and used for business, including cars funded through a cash allowance. HSE expects the employer to make sure those vehicles are safe too: the worker checks the vehicle, has it serviced, and holds business insurance and a valid MOT. Commuting between home and the normal workplace is not driving for work.

Source: HSE, Employers: driving and riding safely for work.

When it goes wrong

The police and the Driver and Vehicle Standards Agency (DVSA) enforce road traffic law. HSE usually only investigates when the police identify serious management failures. Where a work-related crash causes a death, an organisation can be prosecuted under the Corporate Manslaughter and Corporate Homicide Act 2007 if a gross breach of a duty of care is shown.

A maintenance record with dated alerts and actions is the evidence that the duty was managed, not just assumed.

Source: HSE, The law and how it is regulated.

MOT rules for company cars and vans

When is the first MOT due?

In Great Britain, a car or light van needs its first MOT by the third anniversary of its registration, then every year. In Northern Ireland, private cars are first tested at four years, light goods vehicles at three.

For a fleet on three-year contract hire, the first MOT often falls in the last weeks of the contract, or just after an extension. That is exactly when it gets forgotten.

Booking early without losing a month

You can have the MOT done up to a month (minus a day) before the expiry date and keep the same renewal date. A car whose MOT runs out on 15 May can be tested from 16 April. An alert set at 30 days before expiry fits that window.

What it costs to miss it

Driving without a valid MOT can lead to a fine of up to £1,000. Insurers may also contest a claim when a vehicle without a valid MOT is involved in an incident, depending on policy wording. For an employer, the bigger exposure is the duty of care: the car was on the road for work without a basic roadworthiness check.

Status and history are free to check online: expiry date via the MOT status service, advisories and failures via the MOT history service. Advisories are underused: a tyre "close to the legal limit" or "brake pipe slightly corroded" note is a free maintenance alert.

Sources: GOV.UK, Getting an MOT, GOV.UK, Check MOT status, GOV.UK, Check MOT history, nidirect, How the MOT scheme works.

Vans over 3.5 tonnes and operator licences

Goods vehicles that need an operator licence follow a stricter regime: daily walkaround checks, safety inspections at set intervals and records that DVSA can audit. That regime is outside the scope of this article, which covers cars and light vans. DVSA's guide is the reference. Source: GOV.UK, Guide to maintaining roadworthiness.

Which alerts should you track on a fleet vehicle?

Not every warning deserves a phone call. The useful alerts are the ones that are predictable, costly when missed and actionable by someone in particular.

The legal tread minimum for cars is 1.6 mm across the central three-quarters of the tread, around the full circumference. Many fleet policies replace tyres at 3 mm, because braking distances in the wet lengthen as tread wears.

Recalls are checked by registration on the DVSA vehicle recall service. Many recalls now involve software, sometimes fixed over the air, sometimes requiring a dealer visit.

Sources: GOV.UK, Check if a vehicle, part or accessory has been recalled.

Mileage against contract deserves its own article: see our guide to fleet mileage tracking.

Driver checks: what alerts cannot see

Connected data covers a lot, but not everything. A cut in a tyre sidewall, a cracked windscreen, a broken mirror or a load that is not secured will never trigger a warning light. HSE expects workers to carry out and record vehicle checks, and a short routine covers what the car cannot report.

A practical split for cars and light vans:

Before each journey (30 seconds)

• Warning lights on the dashboard after start-up.
• Tyres: visible damage or obviously low pressure.
• Lights and indicators working, windscreen clear.

Every week (5 minutes)

• Tyre tread and pressure, including the spare if there is one.
• Screen wash, and on petrol or diesel cars, oil and coolant levels.
• Wipers, mirrors, number plates clean and readable.
• On vans: load restraints, bulkhead, doors and tail-lift where fitted.

Every month

• Bodywork walk-round, photographed: useful evidence at lease return.
• Charging cable condition on EVs and plug-in hybrids.

Record the checks in the same place as the alerts. A defect found by the driver and an alert raised by the car then follow the same path: reported, assigned, fixed, closed. That single history is what protects the company if a vehicle's condition is ever questioned after an incident.

Electric fleet cars: fewer services, different alerts

An electric car has no engine oil, spark plugs, timing belt, clutch or exhaust. Scheduled servicing is lighter, and many manufacturers set longer intervals. That does not make maintenance disappear: it moves it.

Tyres

EVs are heavier than comparable petrol cars because of the battery, and they deliver full torque from standstill. Both increase tyre wear, especially on drivers with a sporty style. Tyre pressure also affects range directly, which makes the pressure alert doubly useful. Eco-driving coaching reduces wear: see our guide to eco-driving for fleets.

Brakes

Regenerative braking does most of the slowing down, so friction brakes are used less. The flip side is corrosion: discs that rarely work hard can rust, especially in the UK's damp winters, and fail an MOT for that reason. Some manufacturers add a periodic brake-cleaning routine; a brake service at the recommended interval matters even when pads look new.

The 12V battery

Every EV still has a 12V battery that powers the electronics and closes the high-voltage contactors. When it fails, the car does not start, even with a full traction battery. A falling 12V voltage across several days is one of the most valuable predictive alerts on any car, petrol or electric.

The traction battery

Battery health (state of health, expressed as a percentage of original capacity) is the residual value question for EVs. Manufacturer battery warranties typically run eight years, with a mileage limit and a capacity threshold that vary by brand. Tracking state of health and charging habits over the contract gives the fleet manager evidence at resale or lease return.

Software and recalls

Connected EVs receive software updates over the air. Recalls are still published, and some require a workshop visit. A recall alert linked to the vehicle registration closes the loop.

Electrical safety

High-voltage systems must be worked on by technicians trained for them. Check that your service provider or leasing company's network covers EV work in every region where your drivers are based, and brief drivers on what to do after a collision, as HSE recommends.

Preventive, corrective or predictive maintenance: what is the difference?

A good fleet uses all four. The difference between a reactive and a well-run fleet is the share of work that arrives as a planned job rather than as a phone call from a lay-by.

What connected car data gives you without a fitted box

Most cars built in recent years send data to their manufacturer: odometer, service due date (on many models), warning lights, tyre pressure, fuel or battery level, and on EVs the charging sessions. With the driver's consent, that data can be shared with the fleet's software through the manufacturer's connection.

That replaces three manual tasks: asking drivers for their mileage, recalculating service due dates and chasing warning lights after the fact. The coverage depends on the brand and model, so check your fleet list before relying on it.

Who pays for maintenance: owned cars, contract hire and grey fleet

Cars the company owns

The company pays everything: servicing, tyres, MOT, repairs. Maintenance is a running cost deductible for Corporation Tax. The benefit of alerts is direct: fewer breakdowns, better resale value with a full service history.

Contract hire with maintenance

Most UK company cars are on contract hire. With a maintained contract, the rental includes scheduled servicing, routine repairs, tyres within an agreed allowance and often breakdown cover. The driver still has to book the service and report defects; the leasing company pays.

What usually stays with the company:

• damage from accidents or misuse;
• tyres beyond the allowance, or kerbed tyres;
• excess mileage above the contract;
• damage charges at return beyond fair wear and tear;
• the consequences of a missed service, which can affect warranty claims.

Contract hire without maintenance

The rental covers the car only. The company pays servicing and repairs at market rates, and alerts carry the full value: missing a service on a non-maintained lease can create both a repair bill and a lease return dispute.

Grey fleet

The employee pays for maintenance, and the mileage allowance (AMAP, 55p per mile for the first 10,000 business miles since 6 April 2026) is supposed to cover it. The employer's duty of care remains: ask for MOT and service evidence at least once a year.

Source: GOV.UK, Expenses and benefits: business travel mileage.

Lease return: BVRLA fair wear and tear

At the end of a contract hire agreement, the car is inspected against the BVRLA Fair Wear and Tear Guide, the industry standard published by the British Vehicle Rental and Leasing Association. It defines what is acceptable for the car's age and mileage (bodywork, paint, wheels, tyres, glass, interior) and what is charged as damage.

Points that drive most return charges:

• Missing service history: a stamp or digital record per service due;
• Tyres below the standard or damaged;
• Kerbed alloy wheels;
• Dents and scratches beyond the size thresholds of the guide;
• Warning lights on at inspection;
• Missing items: second key, charging cable, locking wheel nut.

Three months before return, a fleet manager with alerts knows which cars have an open warning, an overdue service or tyres close to the limit, and can fix them under the maintenance contract or at fleet rates, rather than paying the leasing company's damage tariff.

Source: BVRLA, Car fair wear and tear guide.

How much does a day off the road cost?

There is no official figure: it depends on what the vehicle is for. The method is simple, and the assumptions below are there to be replaced by yours.

Cost of one day off the road = rental still running + replacement vehicle + lost or delayed work.

• Contract hire rental still running (£450 a month): about £15
• Replacement hire car, if not included in the contract: about £50
• Lost or delayed work (half a customer visit not done): about £75
• Total: about £140 a day

For a sales role, lost work means postponed meetings. For an engineer, unbilled call-outs. For a senior manager's car, it may be close to zero. Calculate by vehicle category, not for the whole fleet in one go.

What the formula does not show: the fleet manager's time on the phone with breakdown cover and the garage, a driver stuck at the roadside, and sometimes a heavier repair because a warning was ignored for weeks.

Worked example: alerts on a 50-car fleet

A fleet of 50 cars on maintained contract hire, three to four-year contracts, so about 15 returns a year. Every assumption is shown: replace them with your numbers.

That is about £59 per car per year from maintenance alerts alone.

The 40% avoided share is a cautious assumption. Alerts do not prevent every breakdown, but a weakening 12V battery, a common cause of non-starts, is one of the failures that gives warning.

The figure is deliberately modest, and that matters for an honest business case. Maintenance is one lever among several. The larger savings come from combining data: mileage (lease bands, business mileage evidence), driving style (energy, tyres, claims) and alerts. Calculate each lever separately with your own assumptions in the telematics savings simulator, then add them. The full method is in our analysis of fleet total cost of ownership.

The time the fleet manager gets back

Without automatic alerts, maintenance tracking lives in a spreadsheet and in people's memory. The fleet manager chases drivers for mileage, recalculates due dates, then chases again for bookings.

With alerts that come from the vehicle, the routine changes:

• Monday morning, a sorted list: cars to call today, cars to book within 15 days.
• No due dates calculated by hand: mileage and, where the manufacturer sends it, the service due date arrive on their own.
• A history per vehicle, useful at lease return, at renewal and in discussions with the leasing company.
• Fewer emergency calls: a weakening battery is handled in a workshop, not at a motorway services.

For the finance director, the benefit is predictability: fewer unplanned invoices, returns without surprises, and a file that shows the duty of care is being managed. The wider fleet manager view is on our fleet manager page.

What the driver gains

Maintenance alerts help the person behind the wheel first.

• Fewer breakdowns: no cancelled rounds, no waiting for recovery.
• Planned appointments: the garage is booked before the due date, at a convenient time.
• A safer car: tyres, brakes and warning lights dealt with on time.
• Less admin: no monthly odometer photo, no "have you done your service?" email.

That comfort depends on trust. Drivers need to know what data reaches the company. A maintenance alert needs no location data: a mileage reading, a battery voltage or a warning light says nothing about where someone went.

Data protection: vehicle data is still personal data

Under UK GDPR, data about a company car becomes personal data as soon as it is linked to a named driver. That applies to mileage and maintenance alerts as much as to location, even if the risk is far lower.

Good practice, in line with the Information Commissioner's Office (ICO) guidance on monitoring workers:

• define the purpose (safety, maintenance, cost control) and collect only the data it needs;
• tell drivers clearly what is collected, why, who sees it and for how long it is kept;
• run a data protection impact assessment where monitoring is likely to be high risk, such as continuous location tracking;
• separate private use: outside working time, location tracking of a company car used privately is hard to justify.

The rules on tracking positions are covered in our guide to vehicle tracking for company cars.

Source: ICO, Employment practices and data protection: monitoring workers.

Setting up maintenance alerts in five steps

1. Build the fleet list

Registration, make, model, year, fuel, ownership (owned, contract hire with or without maintenance, grey fleet), contract end date and mileage, assigned driver. This list alone often reveals forgotten cars.

2. Check which vehicles can connect

Connected car data depends on the brand, model and year. List the cars that can share data through their manufacturer, and the ones that need another route (driver app, manual reading, or a fitted device for older vehicles).

3. Set thresholds and recipients

Who receives what, and when: the driver for tyre pressure and service booking, the fleet manager for MOT, recalls and lease end, the supplier for repairs. Too many alerts kill the useful ones: start with the ten in the table above.

4. Write the rule into the car policy

What the driver must do when an alert arrives, within what time, and what happens if they do not. Include the HSE principle that an unsafe vehicle is not driven, and the defect reporting procedure.

5. Connect alerts to the fleet's tools

Alerts should land where the fleet manager already works, with a history per vehicle, rather than in yet another inbox.

Mistakes to avoid

• Relying on the MOT as a safety check. HSE is clear that it covers basic defects only.
• Forgetting grey fleet. The employer's duty covers employees' own cars used for business.
• Treating EVs as maintenance-free. Tyres, brakes, 12V battery and software still need attention.
• Sending every alert to the fleet manager. Route each alert to the person who can act.
• Collecting location to get maintenance data. It is not needed, and it creates a privacy problem you then have to justify.
• Waiting for the lease return inspection to discover tyre or service issues.
• Keeping the history in someone's inbox. When the fleet manager changes jobs, the service records, defect reports and MOT advisories must stay with the vehicle, in a shared tool, not in a personal mailbox or a spreadsheet on one laptop.

Turn maintenance into a weekly list, not a series of emergencies

Maintenance alerts protect drivers, the duty of care and the lease return budget. They work best when they come from the car itself, without asking drivers for odometer photos and without fitting a box in every vehicle.

Voltaback's telematics needs no hardware: it reads mileage, consumption, eco-driving data, alerts and maintenance information directly from the car's own connection, across more than 48 brands. The company never receives drivers' geolocation, and the platform has been ISO 27001 certified since 2 December 2025. More than 200 companies already use Voltaback for their fleet.

See how it works on our box-free telematics page, or talk to us about your fleet.