2003 GMC Envoy SLT with 226K miles.
Lately I've noticed a faint high pitch buzzing noise coming from the engine bay when the engine is off. I haven't been able to locate it but it seems to be killing my battery quickly. I've had someone state it could be some module not "going to sleep" when the truck is off.
In the meanwhile it seems that when I drive the Envoy everything works just fine. Then when I turn it off its very difficult to restart it. If I wait over an hour the battery is dead and I have to use a jump box to crank it. (It used to be an overnight thing but over the last few weeks its now to the point where the battery is dead within the hour) Once cranked it runs just fine until the next time. I've had the battery charged and they can't find anything wrong with the battery. The alternator seems to be running everything just fine - although the gauge is not sitting at 14 anymore - a couple of notches to the left of 14 now.
Could it be the alternator - even though when the engine is on it seems to run the truck okay? The battery - even though when its charged it seems to work fine? Or should I be looking into a stuck module? Or something else all together?
Thanks to any and all replies!
Lately I've noticed a faint high pitch buzzing noise coming from the engine bay when the engine is off. I haven't been able to locate it but it seems to be killing my battery quickly. I've had someone state it could be some module not "going to sleep" when the truck is off.
In the meanwhile it seems that when I drive the Envoy everything works just fine. Then when I turn it off its very difficult to restart it. If I wait over an hour the battery is dead and I have to use a jump box to crank it. (It used to be an overnight thing but over the last few weeks its now to the point where the battery is dead within the hour) Once cranked it runs just fine until the next time. I've had the battery charged and they can't find anything wrong with the battery. The alternator seems to be running everything just fine - although the gauge is not sitting at 14 anymore - a couple of notches to the left of 14 now.
Could it be the alternator - even though when the engine is on it seems to run the truck okay? The battery - even though when its charged it seems to work fine? Or should I be looking into a stuck module? Or something else all together?
Thanks to any and all replies!