Last week soon after a hard acceleration to get into traffic the battery light came on and a Battery Not Charging message appeared. Consulting my Haynes manual I read that the only two possibilities to a battery not charging would be the battery or the alternator.
I removed the battery and took it to Auto Zone and it tested good. I then replaced the alternator. (The vehicle has 160K on it and the alternator has been making noise for well over a year so I decided to simply replace it.)
I just cranked the Envoy up and the light and warning message are still there. There is an slight inconsistency to this though. The first time I cranked the car it was there. The second time it did not appear until the engine had run about a minute. When left to idle there seems to be a cycling of some sorts as if the load on the engine changes or goes from a fast idle to a slow idle. After about 3-4 cycles of this the engine finally dies during one of the slow idle periods.
On a side note that might be related. The check engine light had come on a week or two earlier and I have to admit I didn't scan until last Friday. While taking the batter to be tested I rented a scanner. When I replaced the battery the CEL had gone out and the scan read "No Codes". The CEL light remains off.
Any help offered is appreciated.
Stuart
I removed the battery and took it to Auto Zone and it tested good. I then replaced the alternator. (The vehicle has 160K on it and the alternator has been making noise for well over a year so I decided to simply replace it.)
I just cranked the Envoy up and the light and warning message are still there. There is an slight inconsistency to this though. The first time I cranked the car it was there. The second time it did not appear until the engine had run about a minute. When left to idle there seems to be a cycling of some sorts as if the load on the engine changes or goes from a fast idle to a slow idle. After about 3-4 cycles of this the engine finally dies during one of the slow idle periods.
On a side note that might be related. The check engine light had come on a week or two earlier and I have to admit I didn't scan until last Friday. While taking the batter to be tested I rented a scanner. When I replaced the battery the CEL had gone out and the scan read "No Codes". The CEL light remains off.
Any help offered is appreciated.
Stuart