How can I go about resetting the anti-theft system on my 2005 Chevy Cobalt?

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8 answers

★ Top Answer

Bobby ALLAN Jan 28, 2021

Here's a paraphrased and rephrased version: To reset the anti-theft system on a 2005 Chevrolet Cobalt, you can start with a simple method like disconnecting the negative battery terminal for 15 to 30 minutes before reconnecting it. However, there are cases where this doesn't work, so you may need to try a more detailed process. To effectively reset the anti-theft system, start by getting into the vehicle and turning the key to the start position, then back to the "ON" position. Keep it in this position for about twelve to fifteen minutes or until the Passlock light turns off. After that, turn the key off, wait for five seconds, and repeat this process three to five times. This procedure is recommended by General Motors customer service as a reliable way to reset the system.

More answers

Sophie W. May 14, 2020

To conveniently reset the anti-theft system, simply turn the engine on and press the accelerator three times in a row.
Jonnie Dec 8, 2020

I have the indicator light with the padlock symbol on my car's dashboard. How can I reset that light so my car can start properly? Right now, the engine cranks but won't start. Thanks in advance for your help.
Brian F Oct 14, 2020

The 2005 Chevy Cobalt is displaying a warning light featuring a padlock and car symbol. You can turn the key to the "on" position and start the car without any issues.
Sue P. Oct 28, 2022

I recently replaced the door lock switch on my 2005 Chevrolet Cobalt. After locking all four doors, I noticed that the horn and lights would turn on when I opened the door. I started the engine and then shut it off to silence the sound and lights. What steps can I take to address this issue?
Honey Sep 14, 2023

I've got an '05 Cobalt, and every time I open the door, the alarm starts blaring. I managed to reset it a few times, and it stopped briefly, but then it started acting up again.
Arthur J Jul 15, 2023

I'm not sure what is real.
Emily C. Jul 14, 2023

In 2007, I mistakenly told someone that I had a Chevy Cobalt with a 2.2 L engine. One morning, after going for coffee and returning home, I found that my car wouldn't start, and the anti-theft system light was on. I tried reprogramming my key twice, spending over an hour, but the issue persisted. I noticed that the anti-theft light on my car was solid, not blinking like others had reported. I decided to disconnect the battery, clean the corrosion from the battery post and eyelets, then reconnect it. Surprisingly, the car started right up. I'm not sure why the anti-theft system was triggered, but cleaning the battery post seemed to fix it, or maybe it was resetting the ECU by disconnecting the battery. Hopefully, this information helps others dealing with a similar issue in this popular vehicle.

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