Skip the auto shop - Our mechanics make house calls

Q: Alarm kill Switch Cannot turn off

asked by on

We bought the vehicle several years ago from an individual seller, we do not have a fob for the van and have only used the key to enter, exit and start the vehicle. As of recently the battery has died on the van and we put in a new battery and reset it, however now the alarm has apparently been reset. We cannot start the car now with this key, or turn over.
My car has an automatic transmission.

Most aftermarket alarm systems have some sort of control module that is tied into the ignition system to prevent the vehicle from starting. Depending on the brand and the installer, it could be under the dash somewhere or under the hood. It has to tap into the ignition system somewhere.

Depending on the brand, it could have tapped into ignition switch wires under the dash or directly to the ignition coil/control module. If you can locate the module and find a brand name for the alarm system, then maybe a local alarm installer can provide you with a fob to arm and disarm the system. There may be an override switch that an alarm installer may be able to assist you with or remove the system entirely if a fob is no longer available. If you need help with this, a certified technician from YourMechanic can come to your car’s location to look over the system and help you get your car started again.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: My car idles rough when stopped

This may be a sign of a leaky injector or potentially an incorrect idle air adjustment. A leaky injector can cause a rich fuel condition as it may leak too much fuel into a cylinder not allowing the combustion cycle...

Q: OBD sensor not reading scanner

This sounds like there is no power to the data bus network. This means that the OBD2 plug on your vehicle is not being powered by the battery. I would enlist the help of a qualified technician to find a wiring...

Q: Car not starting

When an old Benz from the 1908's doesn't start, the first place I usually look is the fuel pump relay. It's a big relay near the battery and the ECU. It's about the size of a pack of cigarettes and...

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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...