Skip the auto shop - Our mechanics make house calls

Q: Can't start car due to security system

asked by on

My car will not start because of the security system. It is not letting it bypass the security. I had to replace the ignition switch, and since then the security system will not let me start the car.

Hi there. Your vehicle’s anti-theft system seems to be malfunctioning. A change of ignition cylinder will cause this problem because your vehicle thinks someone attempted to steal it. It is possible to bypass this anti-theft system in order to ensure the ignition side of your vehicle anti-theft system. Your vehicle’s anti-theft control system maybe the problem as well. This problem is difficult to properly diagnose without having the vehicle physically present. I’d suggest having a certified mechanic look into your issue with more detail to ensure proper diagnosis.

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: Check engine light

Hi There, It sounds like unplugging the MAF sensor may be related to the issue with the purge solenoid that has not been replaced. Your car has a small purge valve with a purge solenoid in the Evaporative Emissions system...

Q: Where is the pats module located

Hello, thanks for writing in about your Ford Taurus. The PATS module is located on the steering column. It is located under the steering column covers behind the ignition key lock cylinder. If you need some help with this, consider...

Q: When weather gets hot, SUV randomly won't start

Hello. This sounds like an issue that would be difficult to diagnose online without inspecting the vehicle. I’m thinking that if you have replaced the ECM module and reprogrammed it, as well and the BCM module, fuse block, and mass...

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...