2003 Impala that starts intermittently

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2003 Impala that starts intermittently

Unread post by FrustratedImpalaGuy » Sat Jan 23, 2010 5:16 pm

We have a 2003 Chevy Impala that always starts in the morning. Later in the day it has problems starting at all. :(

When it won't start, the security light comes on, then the battery light comes on and we hear a clicking noise coming from the middle of the dash and the right side of the dash fuse box. If it does start up, the security light flashes alternating with the battery light. Plus, the interior and exterior lights flash too. It's very strange.

I have read online that it's a "passlock" problem, so we turn the key to ON and let it sit for 20 minutes, turn it off for 2 minutes and sometimes it will start. Sometimes we try disconnecting the battery for a few minutes. But, usually we have to let it sit still overnight until it will always start in the morning.

We're going crazy with this problem, so do any of you expert GM mechanics know what we can do for this? I would be happy to give a donation if you can come up with a definite solution. Thanks in advance. :)

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Re: 2003 Impala that starts intermittently

Unread post by butchkaz » Sun Jan 24, 2010 3:26 am

If this were just a starting problem with the security light coming on when it won't start, and leaving the key on for a few minutes let it start, then yes i would say it were a security problem.
But, the battery light and the clicking tells me this is a low voltage problem.
I would suspect an ignition switch problem. The ignition switch feeds power to many of the systems. Clicking is a definate sign of low voltage, since a relay cannot operate correctly with low voltage.
Another possibility is a bad Body Control Module(BCM).
May sound silly, but make sure the battery cables are tight. Try to tighten them a little more. If the lug in the battery seems to be turning or pulling out of the battery, then you have a bad battey.
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Re: 2003 Impala that starts intermittently

Unread post by freddy » Wed Mar 24, 2010 10:17 am

Check what the voltage is at sevral of the fuses in that right side fuse box. If the voltage goiing in from ignition switch is good- near battery voltage, but coming out is lower, then you have an internal problem in the fuse box. Have seen a few like this. Not just in that box, but others, left box, under hood, etc. Seen it on cars and trucks.

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