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battery light on in message center

jmsal26

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jmsal26 Enthusiast

jmsal26

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I have a 02 GMC sierra 1500 with a 4.8 and the battery light is on in the message center it has 104,000 miles on it and its been on for 2 days it only comes on after I drive it for a little bit I checked the battery I did a load test on it and it checks out put a battery tester on it while its running and it says it at 14.4 to 14.9 the gauge on the dash stays above 14 by 2 marks it starts and runs good no drag when starting I even turned on everything I could AC lights puttn windows up and down volt hand doesn't move it looks like its been going down some since its been warmer weather but I guess that's normal. So what can it be the instrument cluster or is it something else

jmsal26 Enthusiast

jmsal26

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I forgot to add that the battery light is off each time I start it it only comes on after I drive it for about 5 to 8 miles then its back on

jmsal26 Enthusiast

jmsal26

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If the volt gauge keeps going down ima pull the alternator off and get it tested at advance but if it doesn't I don't know what to do it might just be the instrument cluster I noticed when I first got the truck in October last year that the odometer cut off for a second done it a couple of times but never paid much attention to it as it hasn't done that for awhile I know the gas gauge is little bouncey sometimes to but I hear that's common for these trucks by the way how would I scan the ipc I know how to scan the pcm but I didn't think u could scan the ipc

gmtech4 Senior Enthusiast

gmtech4

Posted
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ya need a scanner capable of scanning the IPC ,,,,its a module ,,,,dont worry ,even your door switch assy is a module ,,,only 10 'putors or so on your truck lol

jmsal26 Enthusiast

jmsal26

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Got alternator tested was only puttn out 13.7 got a new one put it on and battery light isn't coming back on yet but rpms are low sittn around 300 rpm but I was told that's normal after unhooking the battery the computer has to learn the idle again drove it around for awhile still rpm hand was sittn low started back up and it seemed like it was normal again just didn't drive back out I will tomorrow to see wat its gonna do

Colossus Senior Enthusiast

Colossus

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That is correct. Let the thing do it's learning thing for a few weeks. Your MPG may be a bit off as well while it is re-learning your driving style, so to speak. All will be well in time.

jmsal26 Enthusiast

jmsal26

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Just drove it to town and back and no battery light yet and the idle was back to normal it just had like a little hiccup when I started it at the store I guess its still learning some if the battery light comes back on I'll be back on here

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