Replaced Alternator, now won't charge - EnclaveForum.net: Buick Enclave Online Community
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post #1 of 10 (permalink) Unread 04-20-2019, 07:11 PM Thread Starter
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Question Replaced Alternator, now won't charge

09 3.6L, 150K. Heard that that the ECM/PCM has to be reprogrammed to get the alternator back online. "Service charging system" is still there as well at battery light. Battery 1 year old, tested good under load, no output from alternator. I'm a Certified Electronics Technicion, Aircraft Electronics Technician and mechanic and have bee to 5 car manufactor's drivability schools, not bragging I promise, just a background. The initial scan showed a U1000, not good but can be triggered by a alternator weird failure. Put new serpentine belt on also. Car starts fine and all electronics work fine, but no matter the rpm, no output from alternator. Very little experience on Buicks and 1st car I've heard will turn off the alternator once failed in the ECM and have to be programmed. True or not true. I do this for friends who are paycheck to paycheck and if I made it through working on MGB's Fiat's and Saab and Alfa Romeo's, I can do this with a little help from my friends. 1st and most important issue is to find out if after ALT replacement only a dealer can reprogram? After ALT replacement even with no out put ran the car a lot, then recharge the battery and the U1000 code never came back, not even pending. Thanks to all for your ideas and help.
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post #2 of 10 (permalink) Unread 04-21-2019, 03:11 AM Thread Starter
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One other point is that I replaced the serpentine belt tensioner and can't get the belt tight enough. The belt is is loose as compared to the original belt and there seems no way to tighten the belt tensioner. New belt seems the same size but belt is too loose. Never seen this before, the tensioner should keep the belt tight, it doesnt't and there is no adjustment on it to tighten it. Never seen that before. Buick has been the toughest car to work on other than Saab, this should be an easy fix, what's wrong?
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post #3 of 10 (permalink) Unread 04-21-2019, 11:21 AM
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Stupid question. Did you miss a pulley? The routing diagram should be there.. Seems to be same size? I ordered a belt from Rockauto a couple years ago for a Buick Terazza, it was the wrong length, seems there was a mid model year change in something and the belt was updated.
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post #4 of 10 (permalink) Unread 04-22-2019, 11:11 AM
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Im wondering if the battery was disconnected before alternator was pulled.
Damaged electronics?


As far as I know- the alternator should be a direct drop in.
Is it a remanufactured unit?

2010 FWD LT1-Gold Mist Metallic- seats 8
Build Date- July 31, 2009-2nd day of Spring Hill 2010 production.
2013 Equinox 3.6L 83,000
2010 Traverse 3.6L 148,000
2003 Trailblazer 4.2L 181,500
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post #5 of 10 (permalink) Unread 04-22-2019, 11:14 AM
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take this picture-- its a 2012. should be the same-
and make sure your belt is routed just like this one.


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2010 FWD LT1-Gold Mist Metallic- seats 8
Build Date- July 31, 2009-2nd day of Spring Hill 2010 production.
2013 Equinox 3.6L 83,000
2010 Traverse 3.6L 148,000
2003 Trailblazer 4.2L 181,500
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post #6 of 10 (permalink) Unread 04-23-2019, 07:48 AM
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Just here to add that I've never heard of an alternator having to be programmed. I know modern vehicle ECU's regulate how hard the alternator is working to increase efficiency when there isn't much electrical demand but I don't believe they can regulate it down to nothing.

I'm leaning toward you got a dud alternator from the parts shop.


Last edited by JayS; 04-23-2019 at 07:50 AM.
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post #7 of 10 (permalink) Unread Yesterday, 10:10 PM Thread Starter
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Pic disappeared? Can you try again, thanks!
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post #8 of 10 (permalink) Unread Yesterday, 11:17 PM Thread Starter
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Thanks for all the reply's guys, forgot my password and trying to get a new one so I couldn't reply as fast as I wanted. Status:

* I checked everything, the 1 time U1000 code was correct, the ECM was fried. Don't know if it went on it's own or if the old ALT failed and spiked the voltage, or the low voltage did something to it, unlikely though. Towed to the Dealer $400 and its running great. Thanks to all for their input. In 75+ cars, this is the 1st ECM I've seen fail, odd thing is that after I got it running again but not charging, no code, that's a priority code and it only showed once which led me to believe it was a programming issue due to failed ALT. Thanks again to all!
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post #9 of 10 (permalink) Unread Today, 11:10 AM
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thanks for the update.


the image was of the front of the 3.6 showing the belt route.

2010 FWD LT1-Gold Mist Metallic- seats 8
Build Date- July 31, 2009-2nd day of Spring Hill 2010 production.
2013 Equinox 3.6L 83,000
2010 Traverse 3.6L 148,000
2003 Trailblazer 4.2L 181,500
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post #10 of 10 (permalink) Unread Today, 11:13 AM
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I have a 2011 with 43000 miles back in May of 18 That with out any indication at all my ecm went out after just parking while shopping . Car would not start and no readings at all Hadto be towed to dealer as an outside shop could not even get readings from the ecm Had this car from new and never had so many problems with other vehicles I've owned With towing that was an $800 fix

2011 CXL2 FWD white Diamond /20" chrome /built 4/11/ purchased 6/11/7seats/mobil1 & pf63/ pinstriped
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