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Re: 2002 Chevy Impala
This sounds like a bad battery or a bad connection at the battery, the guages are the key, check the cables for a white power, this is battery acid corrosion and must be cleaned off, auto zone or kragen auto will test your battery for free.
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Why do think the key security is bad? If you still have a factory key, this is not the problem...if no factory key, you can take your VIN number or original key to GM dealer to get new key that they will program for you...Check for dirty battery connections:)
This is a problem with chevy vehicles that have the system theft light. after a couple of years of using the key, the lock tumblers inside the ignition switch tend to wear out and so causing the system to think it's being stolen. Now you have to put the key in and turn the ignition to the on position, without cranking the car and leave it for 10 minutes until the theft light goes out. Very annoying especially if you're in a hurry. The dealer cost to repair the ignition switch goes for about $600-$800. that includes re-teaching the key.
I would clean the battery connecters or possibly change them. How old is the battery? sometimes when battery get old, they have enough juice to crank the motor but not enough to start it..But then again, if it doesn't crank at all sometimes, it could certainly be a bad or loose battery terminals..Start with this since its the simplest and easiest and could very well be your problem. hope this helps
Body Control Module (BCM) on both counts. Find a shop in your town that specializes in electrical systems to test it. Beware, these can be intermittent problems, so make sure they keep it until the car does what you have observed. Expect to spend about $450 for the replacment. Dealers quoted me between $700 and $1,100 for the same repair. By the way, a new BCM will probably only last you about 12 months.