Car Key Will Not Turn in the Ignition

A key that will not turn is usually the steering lock holding the barrel. Pressing the wheel gently one way while turning the key clears it. The other causes are a worn key or barrel. Do not force it.

That last part matters more than anything else here. The blade is the weakest piece of the whole assembly, and every extra pound of pressure moves a free fix closer to a snapped key inside the lock.

This is about a key that will not turn. A key that turns perfectly well and then will not come back out is a different fault with a different answer.

Why a key stops turning in the ignition

A key turns a barrel only when two conditions are met at once. The wafers inside line up with the cuts on the blade, and nothing outside the barrel can be holding it still.

Three things break one of those conditions, and they are listed here in the order they turn out to be the answer.

• The steering lock is holding the barrel, because a locking pin has dropped into the column under tension
• The key is worn, so the cuts no longer lift the wafers to the right heights
• The barrel is worn, so the wafers no longer sit where the key expects them

How far the key moves narrows it down before anything is touched. No movement at all from the locked position points at the steering lock or the key. Movement partway followed by a solid stop points at the barrel. Full rotation with nothing happening at all is not this fault, and there is a section on that further down.

What to try before anything else

Four checks, in this order, and all four are free. Between them they identify the cause on the large majority of cars in well under a minute.

Why forcing the key makes it worse

Every one of these jobs falls into one of two groups, and the difference between them is decided in the first few minutes by the driver rather than by the car.

A blade is thin brass or nickel silver and it is not designed to take leverage. It fails at the shoulder, right where it disappears into the barrel, which is the worst possible place for it to break. What is left behind is a piece of metal wedged in a lock that must come out before anything at all can be assessed.

That turns one job into two, and the second one is the expensive half. A snapped key removed from a barrel is routine work, but it is work that did not need doing ten seconds earlier.

So the rule is simple. If the key does not turn under gentle pressure, it is not going to turn under hard pressure either. Stop, and work down the list instead.

Is it the key or the barrel?

The spare key answers this on its own, which is why it is the last of the four checks rather than the first thing anybody thinks of.

The spare turns and the everyday key does not. The fault is in the key. The barrel is doing its job and one blade has worn past the point where it works.

Neither key turns. The fault is in the car. Two keys do not wear out on the same morning, so the barrel, or the steering lock holding it, is the answer.

That single test saves more wasted money on this fault than anything else on this page, because a new key ordered against a worn barrel fixes nothing and occasionally makes things worse.

Signs the key is worn

Wear on a blade is easy to see once you know what to compare it against.

• Hold the everyday key next to the spare. Cuts that have gone rounded against cuts that are still square is the whole diagnosis
• The blade looks thinner or polished along its edges
• It has to be held at a particular angle, or lifted slightly, before it will do anything
• It is a copy taken from a copy, which loses accuracy at every generation

Where the key alone is at fault, a fresh blade cut to code rather than copied from the worn one puts it straight, because the code is the original measurement and the worn key is no longer a reliable pattern.

Signs the barrel is worn

A barrel fails differently, and the timeline is the giveaway.

• It got worse gradually over months rather than overnight
• The spare fails in exactly the same way as the everyday key
• The key goes in fine, turns part of the way, and hits a solid stop
• The key feels loose or sloppy in the barrel, with more sideways movement than it used to have

Wafers and their springs wear, and a barrel that has done fifteen years of daily use has been getting looser for the last three of them. Ignition barrel repairs deal with the worn components rather than with the key, and a rebuilt barrel is often matched to the key already in use.

Why a new key sometimes makes it worse

This is the part almost nobody explains, and it catches out a lot of drivers who did the sensible thing.

A key and the barrel it operates wear into each other. Over years the cuts round off slightly and the wafers wear to match them. The pair stays a working set the whole way through, which is why a car carries on starting perfectly on a key that looks visibly tired.

Now cut a brand new key to the original factory code. The new blade is sharp and dimensionally correct, and it arrives at a set of wafers that have spent a decade being shaped by something rounded. The new key is right and the barrel is wrong, and the result is a key that turns worse than the one it replaced.

The lesson is not that a new key is a bad idea. It is that the spare key test has to happen first. A new key is the answer where the key alone has worn. Where the barrel has worn too, the barrel is the job.

When the steering lock is the cause

The steering lock is a pin that drops into the column when the key comes out, and it is there to stop the car being steered without a key.

The trouble starts when the wheel is left loaded. Park with the front wheels turned, or nudge the wheel after switching off, and the pin drops in with weight against it. The pin is then jammed rather than simply engaged, and because the barrel and the lock are linked, a jammed pin stops the key dead.

Gentle pressure on the wheel takes the load off the pin so it can withdraw. Force does the opposite and binds it harder. Where a lock has failed rather than jammed, or the wheel stays locked once the key does turn, that is a steering lock replacement rather than a barrel fault.

What about lubricating the ignition?

Worth doing, and worth doing correctly, because a good deal of the advice on this is wrong in a way that causes the next fault.

Use a dry lubricant. Graphite or PTFE. Work a small amount onto the blade, put the key in and out several times, and let the blade carry it into the keyway. That is the whole method.

Do not spray penetrating or general-purpose oil into the barrel. Oil feels like it helps for a fortnight and then holds every speck of dust and grit the key carries in against the wafers. What starts as a lubricant turns into a paste, and a barrel that was stiff becomes a barrel that jams.

The honest limit is worth stating too. Lubricant frees a barrel that has gone stiff and dry. It does nothing whatsoever for wafers that have worn, so a barrel that improves for two days and then goes back to how it was has told you what the real fault is.

When the key turns but nothing happens

If the key rotates all the way round and the car does nothing, this article has stopped applying. The mechanical side is working, and the fault is on the electrical or the security side instead.

A dark dashboard with no lights at all when the key reaches the ignition position points at the battery, the connections, or the switch behind the barrel.

A dashboard that lights up but no start, especially with a warning symbol showing, points at the security system rather than the lock. The car has read a key and refused it, which is a different problem entirely and is covered under the immobiliser warning light.

How a locksmith fixes a barrel fault

The sequence matters more than the equipment, because each step rules out a group rather than testing a hunch.

The spare goes in first, against the same barrel, which splits the key from the car in one move. The blade is then measured against the code the vehicle holds, which says how far it has worn rather than how worn it looks. The barrel is assessed for play and for how the wafers sit.

Three outcomes come out of that. A key recut to code, where the blade alone has gone. A barrel rebuilt with new wafers. Or a replacement barrel matched to the key already in use, which is the outcome most drivers do not realise is available, because it means one key still works the doors, the boot and the ignition afterwards. Car key replacement is quoted from the registration before anyone sets off.

How to stop it happening again

A barrel that fails today started failing about two years ago, and it gave warnings the whole way.

Act at the wiggle stage. The first time a key needs jiggling, lifting or holding at an angle to work, the wear has already begun. That is the cheap moment to deal with it, and almost nobody does.

Take the weight off the keyring. A heavy bunch hanging off a key in the ignition levers on the barrel every time the car goes over a bump, and years of that wears the wafers unevenly.

Use the spare occasionally. A spare that never comes out of a drawer is a spare nobody has tested, and alternating between two keys spreads the wear rather than putting all of it on one blade. Spare car keys earn their cost on this fault alone.

Dry lubricant once a year on an older car. Thirty seconds in autumn, before the first cold damp mornings arrive, which is when stiff barrels turn into stuck ones.