Skip the auto shop - Our mechanics make house calls

Q: Replaced ignition switch, now the car won't start.

asked by on

It Seems it may be security related. Need to know how to reset security. I think the anti-theft is preventing it from starting. It won't even crank. All other electronics still power up, but no crank or start.security blinks three times intermittently.

My car has 154000 miles.
My car has an automatic transmission.

A: Chevrolet has something called a (VATS) Veh...

Chevrolet has something called a (VATS) Vehicle Anti Theft System which uses a resistive chip ignition key system. VATS has a separate module that is called a TDM or theft deterrent module which sends a signal to the ECM (Car's computer) informing it that there either is or is not a valid key present which will then either allow it to start or not allow it to; depending on whether the key is valid. I would recommend taking it to the Chevy Dealer to have it re-flashed.

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: How do I reduce the cruise control speed?

When in cruise control, you can reduce the speed by rotating the steering wheel-based thumbwheel downwards, towards Set/-. Release the thumbwheel when you have reached your desired speed.

Q: When I turn the key, the engine jumps and shakes the whole car but it won't start.

Hello there. You have several different issues going on with your 2003 Nissan Sentra. If the white smoke was seen immediately after the valve cover replacement, it is likely the oil burning off of the plugs. If the car is...

Q: Ovoverheating

It's possible to have trapped air in the cooling system if the bleeder screw was not opened during the filling procedure. The radiator cap and the cooling system must be pressure tested to eliminate the possibility of a leak. Leaks...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...