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

asked by on

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?

Need advice from certified mechanic? Get help now!

Over 1,000 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!
  1. Home
  2. Questions
  3. My car will not start and the message says "theft". 2004 Pontiac Grand Prix

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 car wont start

Be sure you added an adequate amount of gasoline to the fuel tank. If the starter motor itself is not functioning (i.e., no engine cranking), then the starter circuit has to be diagnosed. If the starter motor is functioning, but...

Q: my indicater light show a battery what do that mean

Typically, that means there is a fault in the charging circuit and/or a problem with battery voltage. I would suggest that you request a battery inspection/diagnostic. During that service, the mechanic would also test charging system output. If you have...

Q: When changing signal stalk do you have to disable air bag?

Hi there. On most vehicles, including your Pontiac Grand Prix, you'll have to remove the steering column and the air bag housing in order to replace the turn signal indicator. This is due to the fact that there are connecting...

Related articles

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...
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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...