Skip the auto shop - Our mechanics make house calls

Q: What is the immobilizer system?

asked by on

What is the immobilizer system?

A: The immobilizer system is an antitheft devi...

The immobilizer system is an antitheft device. It’s designed to prevent any key but one programmed for your car to start the ignition. If a key that isn’t programmed correctly (or that has lost its programming because of a dead battery) is inserted into the ignition, the fuel pump will be disabled and the car won’t start.

If your key is working, the green immobilizer light on your dash should light up briefly when you crank the engine and then turn off. However, if the light flashes and the engine won’t crank, it means the immobilizer system doesn’t recognize the key.

Remove the key from the ignition and try it again, but the key may need to be reprogrammed.

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: I locked my keys in my car and the car battery is dead

Hello there, thank you for asking about your 2009 Chevrolet Cobalt. You will need to have a locksmith or call AAA (if you have it) and explain the situation. The locksmith will unlock the car so you can get the...

Q: AC ISSUES

Hi...we can definitely help you. Basically, to get an estimate of the cost to restore the A/C system, that is get it running, a mechanic needs to test the system up close (perform a system diagnostic) and figure out the...

Q: My security light is on and my 2005 Chevy equinox will not start..what's going on

Check to see if your battery voltage is low, that is below 12.6 volts. If the battery is discharged or faulty, the immobilizer system might set. If battery voltage is normal and you suspect the immobilizer system is on, to...

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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control 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...
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...