Cracked or Broken Key Casing: Repair or Replace?
A cracked key casing is usually fixed with a replacement shell — the internal circuit board and key blade are transferred into a new case, which is quick and inexpensive when the electronics are healthy. Replace the whole key only if the board is damaged, buttons have failed, or the blade is worn. Do not superglue a cracked fob: glue seeps into buttons and battery contacts and turns a simple shell swap into a full replacement.
The fob hit the driveway one time too many. Now the case is cracked, the buttons need a hard press, and you are holding it together with hope. The good news: a broken case is the most fixable of all key problems — as long as nobody reaches for the superglue first.
Here is how to judge what your key actually needs, what a shell swap involves, and the mistakes that turn a cheap fix into an expensive one.
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First, assess what is actually broken
A cracked case and a dead key are different problems that often arrive together. Test the fob before deciding anything: do all buttons respond, does the range seem normal, does the car start? If everything works and only the plastic is damaged, you need a shell — nothing more.
Look closely at the blade as well. Years of use wear the cuts, and a worn blade in a shiny new shell will still stick in locks and strain the ignition. If the blade is visibly rounded or the key has always needed jiggling, mention it — cutting a fresh blade during the shell swap costs little extra and solves both issues at once.
The shell swap: what it involves
A shell replacement moves your original circuit board, battery and key blade into a new case. It is a fifteen-minute job for someone who does it daily: open the old case, lift the board out without flexing it, check the button membranes and contacts, transfer everything across, and test all functions before handing it back.
The key point is that your original electronics stay — which means no reprogramming is needed. The car already knows that board; only its plastic overcoat has changed. Aftermarket shells are widely available and perfectly serviceable; what matters is the care of the transfer, not the badge on the plastic.
Repair or replace: the decision table
Match your key's condition to the right fix. When in doubt, a locksmith's assessment takes minutes.
| Condition | Fix | Why |
|---|---|---|
| Case cracked, all buttons work, blade good | New shell | Electronics healthy; only the housing failed |
| Case cracked, blade worn or sticky | New shell plus fresh blade cut | Solves the case and the wear in one visit |
| Buttons need hard presses or miss | Assess board; likely full replacement | Worn membranes or board damage beyond a shell fix |
| Board corroded or water damaged | Full replacement | A new shell cannot save a dying circuit — see water damage |
| Previous superglue repair attempted | Often full replacement | Glue contamination frequently ruins board and contacts |
Why superglue is the enemy
It is tempting: a crack, a tube of glue, two minutes. Resist it. Superglue wicks into the button membranes and stiffens them permanently, creeps across battery contacts and insulates them, and bonds the case halves so the next opening — for a battery change — cracks the board instead.
We see glued fobs weekly, and the pattern is consistent: a repair that would have been a simple shell swap becomes a full key replacement. Tape as a temporary hold is far less destructive if you must limp through a few days.
- Glue stiffens button membranes — presses stop registering
- Glue films over battery contacts — power becomes intermittent
- Glued cases cannot be reopened safely for battery changes
- Temporary tape holds the case without contaminating anything
What a shell swap costs and how long it takes
A shell replacement is one of the quickest jobs in the trade — typically done in minutes at your location, with no programming and no waiting for parts on common models. Costs vary by make, model and shell type, but it sits at the inexpensive end of key work, far below a full replacement key.
Full replacement enters the picture only when the electronics are compromised. Your locksmith should explain which camp your key falls into before any work starts — if the board is healthy, nobody should be selling you a whole new key.
Preventing the next crack
Keys break from drops onto hard surfaces and from pocket pressure against coins and tools. A silicone cover absorbs the impacts that crack cases, and giving the fob its own pocket — away from coins, screws and pocket knives — prevents both cracks and scratched blades.
If the blade is the weak point rather than the case, worn key replacement thinking applies: fix wear before it becomes a snapped key in the ignition, which is a far bigger job.
It is also worth checking how the key is carried day to day. Fobs clipped to a crowded keyring swing against the ignition surround and door handles thousands of times a year, and that constant tapping is what starts the hairline cracks. A lightweight ring with only the essentials, or a fob kept separate from heavy house keys, adds years to a case.
Get the case sorted properly
A cracked fob only gets worse — moisture gets in, buttons fail, and eventually the board pays the price. Auto Locksmith Alvechurch fits replacement shells and cuts fresh blades across Alvechurch, Bromsgrove, Redditch and Birmingham South, usually in a single short visit. Where the electronics have had it, a full replacement key is cut and programmed on the spot. Call or WhatsApp 07367 634032, 24 hours.
Frequently asked questions
Can a cracked key fob case be repaired?
Usually it is replaced rather than repaired. The circuit board is transferred into a new shell, which is quick and needs no reprogramming.
Is it safe to superglue a broken key fob?
No. Glue damages button membranes and battery contacts and makes future battery changes impossible. Use tape temporarily instead.
Will I need reprogramming after a shell swap?
No. Your original circuit board is retained, so the car recognises it exactly as before.
Are aftermarket key shells any good?
Generally yes. The electronics are what matter, and those stay original. A well-fitted aftermarket shell serves reliably.
When does a cracked case mean a whole new key?
When the board is corroded, buttons have failed, or glue has contaminated the internals. A quick assessment confirms which applies.