Skip the auto shop - Our mechanics make house calls

Q: security system wont shut off and vehicle wont start has no electrical power at all

asked by on

security system activated and vehicle wont start got the vehicle 6 years ago had no problem with security cant find fob

My car has 140000 miles.
My car has an automatic transmission.

A: When security systems fail, you can reset i...

When security systems fail, you can reset it on most vehicles by unlocking and locking the drivers or passenger doors two or three times in a row. One other trick is to disconnect the battery, turn the key into the run position and reconnecting the battery. If either of these don’t work, then you probably have a failure in the system.

A common failure that leads to security issues are the door switches. The driver door being the most used is more often than not the culprit. Door switches indicate to the alarm system that the doors are closed. If the door switch is in a position it doesn’t expect, it will assume someone is attempting to steal the car. Checking the door switches can be done easily by turning on the key, opening each door individually and watching the door ajar light to see if opening the door turns the light on. Of course, if the light is on with all the doors shut, you know there is a problem.

Another common failure on GM vehicles is the theftlock wiring breaking. These wires are part of the sensor that is activated when the key is inserted into the ignition. You can test this by turning the key on for ten to fifteen minutes, then starting it. If it starts, you have a theftlock problem. This will require replacing the ignition lock cylinder.

Good luck! I hope this helps you out.

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

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 truck is overheating and when I turn heat on only cold air comes out?

Hi there. Check for any external coolant leaks. Look at the radiator, heater hoses, radiator hoses, heater core, and the core plugs (freeze plugs) on the engine and see if there is any visible coolant leaks. If there is no...

Q: thinking of buying a truck with 300K miles,well maintained etc. would it be a good idea?

The thing to look at is this is a full size truck with a small V6 engine size. This engine would have worked harder than a larger V8 engine would have. This does not mean the engine is bad but...

Q: No crank, no start. Some electrics work (headlights, day time running lamps) no windows or radio.

From what you've described, you may have a shorted vehicle harness in one of two places. First, check near the battery brackets for the main computer harness chafing on the bracket. Afterwards, check the other the wire harness located under...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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 Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.