Q: My car will not start and the message says "theft". 2004 Pontiac Grand Prix

asked by on December 10, 2016

car always ran fine but now, my car wont let me start it up it keeps saying "will not start due to theft system" do you have any idea what to do? the car is an 04 Pontiac grand prix Gt

My car has 258000 miles.
My car has an automatic transmission.

Hello. It sounds like you have an issue with the anti theft system malfunctioning. This commonly occurs on this vehicle. Most of the time this is caused by a failure in the key sensor in the ignition key cylinder. It can also be an issue with the theft module itself. I usually start by resetting the system to see if it starts. If the problem persists then I test the key sensor and replace it if it is bad. If that is also fine then the issue is usually in the module which would need to be replaced and programmed. Anti theft issues are best repaired by the dealer.

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

Cannot start car daily with unless using starter fluid

Working with starting fluid can be pretty dangerous. One backfire and you can lose your eyebrows in a flash...or worse. That said: a car that is hard to start when cold could just have an air leak. Look for any...

Rpm problem

Hi Ritchie. Thanks for contacting us today. The first thing you need to do is isolate the source of the RPM increase. It is possible that a vacuum hose was not correctly attached during the service, so I would recommend...

Key stuck in ignition car is dead

This is a known issue with the Pontiac G5 and can be caused by a couple of different possibilities. One possibility is related to the transmission shift lock assembly or position indicator sensor which is what prevents the key from...

Related articles

How to Troubleshoot a Car That is Hard to Start
"Car not starting" is a common complaint among car owners and is caused by faulty car batteries, spark plugs, car starter, or fuel pump.
How to Choose a LoJack System For Your Car
LoJack LoJack is the trade name for a radio transmitter technology system that allows vehicles to be tracked if they have been moved unwantedly, or have been stolen. LoJack’s trademark technology is the only one on the market used directly...
5 Essential Things to Know About Your Car's Anti-Theft Device
Your Your car’s anti-theft device is installed in an effort to help protect your investment from thieves. Most cars today include a variety of these devices and systems that not only protect the car, but also deter theft in the...