Updated · Keys and lockouts
Why the car locked with the key inside
Proximity systems look for the fob's signal inside the cabin. When that signal is weak or blocked, the car can decide the key isn't there and lock anyway.
- The fob battery is low, so the car can't hear it.
- The key is in the trunk, a metal case or a bag the signal can't pass through well.
- You unlocked with the remote, didn't open a door, and the car relocked itself after a short wait.
- A second fob or the metal backup key was used to lock the doors.
First, is anyone inside?
Don't count on the air conditioning. A car left running can shut itself off, and a parked car heats up quickly in the Texas sun. If a child or pet is inside, call 911 right away instead of waiting to see whether the doors unlock.
Things to try before you call
Smart key or not, the simple options come first.
- Pull every door handle, plus the trunk or rear hatch.
- Ask someone to bring the spare fob.
- Try the carmaker's phone app or connected service if your account is active.
- If a window is open, see whether the unlock button is in easy reach without forcing the glass.
How a technician opens a keyless car
A smart key doesn't change how the door gets opened. The technician eases a thin inflatable wedge into the top corner of the door, makes a narrow gap, and uses a long-reach tool to press the unlock button or pull the inside handle. Your fob stays right where it is.
Some cars sound the alarm when a door opens this way. It normally stops once you press unlock on the fob or start the car.
When the car battery is dead too
With a dead car battery, the power locks can't respond and the car can't detect any fob. In that case the technician opens the door first and can then jump-start the car, so mention both problems in the same call.
If the fob itself was the weak link, replace its coin battery soon. Otherwise the same thing is likely to happen again.