You turn the key or press the ignition button in your car and nothing happens.
The engine doesn’t fire and a small dashboard light shaped like a key or a padlock blinks at you as though it knows something you don’t.
It’s usually at this point you start wondering who to call.
Most people assume an immobiliser fault means a trip to the dealership, a tow truck and a bill that makes your eyes water. In reality, many of these problems can be sorted by a mobile auto locksmith, often on your driveway or in the car park where your car has decided to give up.
Sometimes, the fault is as simple as a tired key battery, but you shouldn’t need to pay dealership prices to find that out.
In this blog, we’ll explain what immobiliser problems look like, what an auto locksmith can fix and the situations where you’d be better off calling a garage. Here at Grays Locksmiths, our mobile team covers Nottingham and the surrounding areas, so we’ll tell you which camp your problem falls into.
What does an immobiliser do?
Your car won’t start unless it recognises your key. The immobiliser is the system that makes that decision. Inside the plastic head of your key sits a tiny chip called a transponder, which sends a unique code to your car when you put the key in the ignition or bring it close to the dashboard. If the code matches the one stored in the car’s computer, the engine is allowed to start. If it doesn’t, the car stays put.
Nearly every car built since the late 1990s has one, which means most drivers in Nottingham will have to deal with an immobiliser at some point. The system works with several types of key, including standard transponder keys, flip keys that fold into the fob, remote fobs and the keyless entry systems you’ll find on newer models. Whichever you use, the principle is the same – no code, no ignition.
Immobilisers are a big reason car theft became harder over the past couple of decades, because a thief can no longer start a car by breaking the ignition or hot-wiring it. The downside is that when something goes wrong with the key or the system, the car treats you as a thief, too, and it won’t make an exception for the fact you’re standing in the rain with the right key in your hand.
Signs your immobiliser is causing problems
Immobiliser faults vary between makes and models, but a few symptoms crop up again and again. Here are the ones we see most often when customers call us:
- The immobiliser warning light stays on, or flashes when you try to start the car.
- The engine turns over but won’t fire, or it starts and cuts out after a second or two.
- The car doesn’t recognise your key, even though the remote still locks and unlocks the doors.
- Problems begin after the key has been dropped, soaked or fitted with a new battery.
- Trouble starts after you’ve had a new or spare key cut somewhere else.
That last one catches many people out. A key that has been cut but not properly programmed might open the door and turn in the ignition without ever communicating with the car’s immobiliser, so the engine refuses to start. Cheap copies from kiosks and online sellers are common culprits, particularly when the chip inside is poor quality.
Before you assume the worst, it’s worth ruling out a flat car battery. A weak battery can produce similar symptoms, including flickering dashboard lights and a car that refuses to start. It’s far easier to fix. If the lights are dim, the central locking is sluggish, or you hear a rapid clicking noise when you turn the key, try a jump start or call a breakdown service before you blame the immobiliser. Once the battery is ruled out, though, an immobiliser fault is much more likely.
What can an auto locksmith do about it?
An auto locksmith can do a lot more than get you back into a locked car. Our engineers carry specialist diagnostic and programming equipment, so they can deal with many immobiliser-related problems at the roadside, including:
- Replacement keys: we can cut and programme new transponder keys, flip keys and remote fobs on the spot, even if you’ve lost every key you own.
- Reprogramming: if a key has stopped communicating with your car, we can often re-sync it so the engine starts again.
- Diagnosis: we can work out whether the fault lies with the key, the chip inside it or the car’s side of the system.
- Key repair and replacement: cracked casings, worn buttons and damaged transponders can often be repaired or swapped without buying an entire new key.
- Broken key extraction: if a key has snapped in the lock or ignition, we can remove the pieces without damaging the barrel.
We can work on virtually every make and model, and because our engineers come to you, there’s no need to arrange a tow or recovery truck. Wherever you’re stuck, at home, at work or at the side of the road, we’ll bring everything we need to your vehicle.
Speed matters when you’re stuck, so we can supply replacement keys and fully programmed remote fobs for most makes and models from our security centre in Nottingham.
It also helps that we deal with this equipment every day. Immobiliser systems differ between manufacturers and a key that works on a Ford might need a different procedure on a BMW or a Vauxhall. Our engineers know which approach suits which vehicle, so you’re not paying for trial and error. We’ll tell you at the outset if we think the problem lies elsewhere. It’s also why we can usually give you a clear price before any work starts.
Auto locksmith or dealership?
Replacement keys and programming from a main dealer often come at premium rates and the bill can climb once labour and ordering charges are added.
Convenience is where a mobile locksmith pulls ahead. If your car won’t start, a dealership will usually want it brought to them, which means paying for recovery and then waiting for a workshop slot, sometimes without the car for days. We can come to wherever your car is parked and fix it there and then, so you can carry on with your day.
Dealership service departments tend to keep standard working hours, whereas our team is available 24/7 for emergencies, which is useful when your car refuses to start on a Sunday evening or late at night.
That said, we’re not going to pretend a locksmith can fix everything. If the fault lies with the car itself, such as a failed immobiliser control unit, a problem with the engine control unit (ECU) or damaged wiring, you’ll need a garage or a dealership specialist with the right diagnostic tools to repair it. We’d rather tell you that straight away than carry out work that won’t solve the problem and leave you out of pocket.
A good rule of thumb is to ask the locksmith what they think is causing the problem before they start. A reputable one will talk you through the likely cause, give you a price up front and be happy to say if the job isn’t one for them. If you’re getting vague answers or pressure to agree to work straight away, it’s worth calling someone else.
What to do if your car won’t start
Before you pick up the phone, there are a few quick things you can try.
Use your spare key. If it works, the problem is probably with your main key rather than the car.
Replace the battery in your key fob. It’s a cheap fix that sorts out more problems than you’d expect.
Check your car battery, looking for dim lights or a slow, weak crank when you turn the key.
Wait a few minutes with the ignition off, then try again with the key held close to the dashboard or start button.
Resist the temptation to keep trying to start the car, as repeated attempts can cause some systems to lock out. It’s also best to steer clear of unvetted ‘quick fix’ merchants and DIY programming kits of unknown quality, which can leave you worse off. If none of that works, call a professional.
How can Grays Locksmiths help?
At Grays Locksmiths, our auto services cover emergency car opening, replacement car and van keys, transponder keys, remote fobs, flip keys and key problems linked to your immobiliser. Our engineers use specialist tools and techniques designed to avoid damaging your vehicle and we’ll always try a non-destructive approach first.
We’re proud to be members of the Master Locksmiths Association, which means we’ve been vetted, inspected and approved to high standards. Our engineers arrive in marked Grays Locksmiths vehicles with ID, and we’ll give you a clear price before any work begins, so there are no nasty surprises when the job is done.
We’ve been looking after drivers across Nottingham for many years and we know how disruptive a car that won’t start can be. So, if you’re not sure whether your problem is a job for us, tell us what’s happening and we’ll give you an honest opinion over the phone. If we can fix it, we’ll get to you quickly and if we can’t, we’ll point you in the right direction.
Call us on 0115 942 2315 for a quote and we’ll get your car and your day back on track.