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

asked by on September 10, 2016

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.

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?
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

My car won't start - Chevrolet Celebrity

Hello - A bad engine coolant temperature sensor is a reasonable diagnosis; it could certainly cause the engine to run too rich if it's sending a bad signal to the engine computer. Before purchasing a new temperature sensor, you can...

Code 1349 P

Hey there. Try having the compression checked for each cylinder. I have had experiences where this code pops up due to a lack of compression from a burned exhaust valve. Also, are you using the right fuel? Using inferior fuel...

Tries to run but won't get over 400 rpm before dying.

Hi there. Check for the three essentials that the engine needs to run, fuel, spark, and air. If you are having fuel and the pressure is 30 psi or higher, then check for spark on the spark plugs and wires....

Related articles

The Best Used Cars to Buy If You're a General Contractor
If If you're a general contractor, you probably aren’t in the market for a used car. More likely, you’re looking for a pickup truck, because you need to haul equipment and supplies to various job sites. Most contractors will likely...
How to Start a Car in Cold Weather
Battery, oil, and fuel problems can make a car difficult to start in cold weather. Find out how to prevent starting issues related to weather.
The Best Used Cars to Buy If Safety is #1
Maybe Maybe you’re a parent buying the first car for your teenager, or perhaps you’re a new parent and the safety of your little one is of the utmost importance. Or perhaps you're a safety-minded individual looking to make a...