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Randall C
Randall C, ASE Master Tech
Category: Chevy
Satisfied Customers: 12831
Experience:  ASE Master, L1, 32 years, Diagnostic / Electrical Specialist
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how to reset antitheft system 2007 chevy cobalt

Resolved Question:

how to reset antitheft system 2007 chevy cobalt
Submitted: 6 years ago.
Category: Chevy
Expert:  Randall C replied 6 years ago.
Hello, what are you referring to? is the security light on and engine will not start?
Customer: replied 6 years ago.

accidently locked keys in car key left on broke in car charged battery i have no power going to my starter i have an icon of a locked car in dash have tried locking and unlocking car with key disconnecting the battery cabel i waited for icon to go out

none of this has did any good


2007 chevy cobalt LS 4 cylinder engine


Expert:  Randall C replied 6 years ago.
There really is nothing like a simple reset. All of this is done using a shop scanner . There is a 30 minute relearn you can try to see if it resets. If not, unfortunatley, a shop will have to hook up scan tool for reset

0-Minute Relearn Procedure

Use this procedure after replacing any of the following components:

  • The PASS-Key III plus keys
  • The theft deterrent module (TDM)
  • The powertrain control module (PCM)
  1. Important:
    • This procedure is not available on vehicles equipped with EXPORT configured TDMs.
    • When performing the 30-minute relearn procedure, all previously learned keys will be erased from the TDM memory. Additional keys may be learned after performing the relearn procedure.
    • When replacing a TDM with a GM SPO Replacement Part, ensure the procedure to setup a new TDM is performed prior to the 30-Minute Relearn Procedure.

With a master vehicle key, turn ON the ignition, with the engine OFF.

  1. Observe the security indicator. After approximately 10 minutes , the telltale will turn OFF.
  2. Turn OFF the ignition, and wait 5 seconds .
  3. Repeat steps 1-3 two more times for a total of 3 cycles or 30 minutes .

Important: The vehicle learns the key transponder information and/or passwords on the ignition switch transition from OFF to RUN. You must turn the ignition OFF before attempting to start the vehicle.

  1. With a master vehicle key, start the vehicle. The vehicle has now learned the key transponder information and/or the ECM has now learned the fuel continue password.
  2. If additional keys are required to be learned, refer to Adding Keys.
  3. With a scan tool, clear any DTCs.


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