You press the unlock button and… nothing. No beep, no flash, no click. Before you assume you need a new key (which can cost £150+), try these fixes. Many "broken" key fobs are just dead batteries or simple issues you can solve yourself in minutes.
1. Replace the Battery (Most Common Fix)
This is the fix for roughly 80% of "dead" key fobs. Most car key fobs use a standard CR2032 or CR2025 coin battery — the same type used in watches and calculators. You can buy them at any supermarket, pharmacy, or petrol station for about £2-£3.
How to do it:
- Look for a small seam or slot on your key fob casing
- Gently pry it open with a small flathead screwdriver or a coin
- Note which way the battery faces (+ side up or down)
- Swap in the new battery — don't touch the flat surfaces with your fingers (oil from skin can reduce contact)
- Snap the case back together
Warning signs it's the battery: The remote works sometimes but not others, you need to be closer to the car than you used to, or the LED on the fob is dim or doesn't light up when you press a button.
2. Try the Spare Key
If you have a spare key, test it. If the spare works fine, the problem is with your main key — likely the battery, physical damage, or a component failure. If the spare also doesn't work, the issue might be with the car itself.
3. Check for Signal Interference
Key fobs operate on radio frequencies (usually 315 MHz or 433 MHz in the UK). Strong radio signals can block them. Common culprits:
- Being parked near mobile phone masts, radio towers, or large electrical transformers
- Being near airport radar or military installations
- LED streetlights with faulty drivers (surprisingly common)
- Another key fob being pressed at the same time nearby
Fix: Try moving the car a few metres, or hold the fob right against the driver's window or door handle.
4. Try the Manual Key Override
Almost all key fobs have a physical metal key hidden inside — look for a small release button or catch. You can use this to manually unlock the driver's door, even if the remote is dead. On some cars, holding the fob against the start button (even with a dead battery) will still allow the car to start via a backup NFC chip — check your owner's manual.
5. Reprogramme the Key Fob
Sometimes a key fob loses its programming. While many modern cars need specialist equipment to reprogramme (that's when you call us), some older vehicles have a simple DIY procedure. Search "[your car model] key fob reprogramming" to see if there's a manual method — some Fords, Vauxhalls, and Toyotas from the 2000s can be reprogrammed by cycling the ignition and pressing buttons in sequence. If that doesn't work, give us a call and we can do it in minutes.
6. Check for Physical Damage
Has the key been dropped? Got wet? Left in a hot car? Look for:
- Cracks in the casing — moisture kills key fob electronics fast
- Corrosion on the battery contacts — green or white residue means water damage
- Loose buttons — the micro-switches on the circuit board can break off
- A burnt smell — a short circuit has fried the board
If the circuit board is physically damaged, you'll likely need a replacement key. We can supply and programme one for significantly less than a main dealer.
7. The Problem Might Be the Car, Not the Key
If both keys stopped working at the same time, or a new battery doesn't help, the issue might be on the vehicle side:
- Blown fuse — the central locking or keyless entry fuse may have blown. Check your fuse box (usually under the dashboard or in the engine bay). Replacing a fuse costs pence.
- Flat car battery — if the car battery is completely dead, the central locking receiver has no power. Try the manual key in the door.
- Faulty receiver module — the car's receiver unit may have failed. This is rare but does happen, especially on older vehicles. A diagnostic check can confirm this.
When to Call a Professional
If you've tried the above and your key fob still isn't working, it's time to call us. We can diagnose the issue on-site — whether it's the key, the car, or both — and in most cases, we can supply and programme a replacement key there and then. No towing, no dealer wait times. See our key replacement page to learn more about how we replace and programme car keys for all makes and models.
Key fob not cooperating?
Call Bridlington Keys on 07706 303038 or get a free quote online. We cover all of East Yorkshire 24/7.