How do I reset the memory on my 2002 impala after the battery has been replaced

Asked by Oct 25, 2015 at 12:30 PM about the 2002 Chevrolet Impala FWD

Question type: Maintenance & Repair

I have a security issue with my 2002 chevy impala. I let it sit 10 mins and it
usually resets and the car starts. My battery died when I was doing this and I
took it to bee charged and found it was bad, so replaced it. It had been out of
the car for 24 hours, now it wont start. I need to know ow to reset my
computer since there has been no battery keeping the memory.

4 Answers

80,325

This should have no effect on the security system. The only things you should lose by disconnecting the battery are the clock a radio presets. Your Impala is currently under recall for the ignition switch. Contact your local Chevrolet Dealer and have them take a look at it. Sounds like a problem with the anti-theft module in the steering column. HTH. -Jim

1,765

When you say you usually let it sit 10 mins it resets. This has me concerned, how many times have you had to reset this? why have you had to reset this? Yes the reset procedure is to let leave the key on for ten mins then shut it off then try to crank If it does not start you do this up to three times. But if you are doing this on a reg basis you need to have your ignition switch replaced, As Jim has stated there is a recall on a large number of GM cars and yours may be one of them.

1 people found this helpful.

I was told (after the fact) that changing out a battery you have to maintain the 12v circuit on the vehicle or you lose memory. OK how do you fix the problem after driving it 300miles and the codes don't clear? Hmmmm? Well why didn't the manual warn us against this. Ooooh I know, so you have to take it in for certified repairs.

80,325

That's actually not true. It's perfectly safe to disconnect/replace the battery. You'll have to reset the clock and possibly the radio presets but that's it. What codes do you have that aren't clearing? The vehicle must first be repaired correctly and then driven with the gas tank between 3/4 and 1/4 for a few days. If you have a scan tool you can clear the codes with that. If you are keeping the gas tank above the 3/4 mark or below the 1/4 mark the computer won't run all of the diagnostics to clear the codes. Assuming that the vehicle has been repaired correctly! HTH. -Jim

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