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?

A: The content theft deterrent (CTD) alarm wil...

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Not sure if I am getting the right things done to my car

Hi there. Quite often mechanics will work with their customers and most importantly; their budgets to try small and inexpensive repairs, hoping that solves the issues. In their efforts to attempt to help; they're actually making the problem worse. However,...

Q: How do I replace the battery in my key fob?

The key fob that comes with your truck has a battery inside. At some point in time, you will find the need to replace this battery. To replace the battery on your key fob. Use a thin coin to...

Q: Oil leaking from front of van

If the oil is coming from the driver's side front corner, you may have a transmission fluid leak (which is common). If the oil is coming from closer to the left, the fluid may be a number of things. I...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...