Is it always the battery?

No, but it's the most common single cause. The reason a mechanic tests rather than assumes is that a failing alternator, a bad earth or a starter fault can all look exactly like a flat battery from the driver's seat.

The car started after a jump — do I still need someone out?

Quite possibly. A jump start gets the engine running but doesn't tell you why the battery was flat. If it goes flat again, the underlying fault is still there and worth testing.

Can a mobile mechanic replace a starter motor at my house?

Sometimes. It depends entirely on where the manufacturer put it — some are accessible from above, others need the car raised or components removed, which pushes it into workshop territory. The mechanic will tell you once they've looked.

Will you tell me what's wrong over the phone?

No, and be wary of anyone who does. We'll take the symptoms, arrange a mechanic and let them test the car properly.

What if the car can't be fixed there and then?

You'll get a clear explanation of what was found and what needs to happen next, which is useful to whoever ends up doing the repair. The mechanic's charges for the visit are agreed with you beforehand.

Won't start

Car won't start — getting a mobile mechanic out

A car that won't start is the single most common reason people look for a mobile mechanic, and it's rarely obvious from the driver's seat what's actually wrong. The useful first step is describing exactly what happens when you turn the key or press the button, because that narrows things down considerably.

Rolling Mechanics arranges an independent mobile mechanic to come to the car and test it properly rather than guess. We cover London and inside the M25, and a little beyond if you ask.

We won't diagnose your car over the phone — nobody honestly can. What we can do is get someone to it who will.

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Anywhere within the M25 — and if you're a little bit outside it, we'll still make the effort to reach you.

Describe what it does — it matters

Nothing at all: no lights, no click, completely dead
A single loud click, then nothing
Rapid clicking and dashboard lights flickering
Turns over slowly but won't fire
Turns over normally and still won't fire
Starts then immediately cuts out
Immobiliser or key symbol showing on the dash

Common possibilities

These are possibilities, not a diagnosis — several of them produce very similar symptoms and only testing separates them:

A flat or failed battery, which is the most common single cause, especially after cold nights or short journeys
Corroded or loose battery terminals and poor earth connections
A failing alternator that hasn't been charging the battery properly for a while
A starter motor or solenoid fault, which can give a single click and no crank
A fuel delivery problem — pump, filter or, occasionally, simply no fuel
Ignition components such as plugs or coils on a car that cranks but won't fire
Immobiliser or key recognition faults, sometimes from a flat key fob battery
A crankshaft or camshaft sensor fault, which can stop the engine firing with no warning

What the attending mechanic can assess on site

A no-start visit is a process of elimination with test equipment rather than parts swapping:

Battery resting voltage and a load or conductance test
Charging voltage with the engine running, where it can be started
Starter motor current draw and the condition of the main leads and earths
Stored fault codes across the engine and body control modules
Basic fuel and ignition checks appropriate to the symptoms
Parasitic drain testing where the car keeps going flat

How booking a mechanic works, and what you pay

Rolling Mechanics is a booking and introduction service, not a repair garage. There are two separate payments and you'll know both before anything is confirmed:

Send us the vehicle, registration, symptoms and location — a map pin from your phone is ideal
We speak to an independent mechanic we know personally and confirm their expected price for the described work
You pay Rolling Mechanics a separate booking and introduction fee to secure the mechanic. It is not a deposit and it is not deducted from the mechanic's bill
The mechanic attends and you pay them directly for their labour, diagnostics, parts and repair work

Things worth checking before you call

None of this is a fix, but it saves time and occasionally saves a call-out entirely: check the car is properly in Park or Neutral, try the spare key, make sure the fuel gauge isn't telling you something obvious, and look for interior lights that are dim or absent. Note whether the car was fine yesterday or has been getting progressively slower to start — that history is genuinely useful to the mechanic.

When recovery or a workshop is the safer option

If the car is on a motorway, hard shoulder, slip road or anywhere with live traffic, that's a job for the emergency services or your breakdown provider first — the car needs to be somewhere static and safe before anyone works on it. If there's a smell of fuel, visible smoke or signs of an electrical burn, don't keep trying to start it. And some no-start faults — deep wiring problems, immobiliser programming, internal engine failure — need a workshop with more time and equipment than a roadside visit allows.

We'll either get you back on the road, or our experienced mechanics will give you a solution.

Questions we get asked

What we can arrange

Where we cover

Request a mechanic

Call or WhatsApp us with the vehicle, what it's doing and where it is — you can share your location straight from your phone. Prefer to type it out? Use the request form on the homepage and we'll come back to you.

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Rolling Mechanics is a trading name of Symatec Ltd (company number 17217755). We introduce customers to independent mobile mechanics and charge our own separate booking and introduction fee — see our terms & conditions.