Skip the auto shop - Our mechanics make house calls

Q: Car alarm is going off when using clicker to unlock the car

asked by on

I recently had a problem with my getting my car to start. It ended up being because of the battery and the starter, both of which I replaced myself. But, my alarm has been acting weird. While I was replacing the battery and working on the car, anytime I would plug in the battery, the alarm would go off. It is not the same alarm sound that goes off when I use the alarm button, or if there would be a theft attempt. I figured it was because of low voltage with the old battery. Now that I have the new battery, every time I use the key fob to unlock the car, the alarm goes off. At first, it went off on the second click (it takes two clicks to unlock the doors). Now, the alarm is going off on the first click. I'm afraid that the car is telling me that it's going to immobilize itself soon. Sometimes the alarm goes off when I start the car, as well. I can't figure out what is causing this. I don't think there is a fuse that can be removed that would fix this. Any ideas?

The content theft deterrent (CTD) alarm will sound when either the door is opened without using the key to unlock the driver’s door, or when the door is unlocked without using the unlock command from the keyless entry transmitter. My guess is that, for some reason, the control module is not recognizing your key fob. Instead of locking your doors with the remote, try locking them manually. This should solve your problem. You can also deactivate the CTD by doing the following:

  1. Press either door lock switch.
  2. Use the key to unlock the driver’s front door.
  3. Press the unlock button of the transmitter.
  4. Insert the key into the ignition and turn the vehicle on.

Of course, these are work arounds. For a permanent fix, I suggest you have a trained professional diagnose your initial starting issue and other causes to repair your vehicle.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Car alarm is going off when using clicker to unlock the car

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: 08 Buick lacrosse leaning on the right side

Hi there. In most cases, when your vehicle leans to one side, it's caused by a bad or worn out body mount or a shock or strut that needs to be replaced. The best way to determine the source is...

Q: Passenger side door not unlocking manually with key. Key won't insert into the door. Trunk lock works fine.

Hi there. The door lock cylinder has either an object in side it causing the key to not fit or the pins inside the cylinder has fallen into the key hole. I recommend replacing the door lock cylinder. If you...

Q: How do I unlock the doors with the Intelligent Key?

The Intelligent Key allows you to unlock your vehicle without actually using a key. To unlock your car with the Intelligent Key, simply press the Request switch on either front door handle, or on the trunk handle, while the Intelligent...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.