Charge system fault error
Thread Starter
Le Mans Master
Joined: Oct 2005
Posts: 7,196
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From: Texas Where God intended me to be.
2023 Corvette of the Year Finalist - Unmodified
2022 C5 of the Year Winner - Unmodified
Cruise-In X Veteran
St. Jude Donor '08 thru '11,'22 thru '26
Charge system fault error
When I had the A&A supercharger installed we put in a new GM Gold Alternator. Everything was fine for a while but Now I'm getting a Charge Fault Error message on the DIC. I can look at the Battery voltage on the DIC and it is at 13.9-14.1 continually. the message only comes up a couple of times than goes away. I've driven the car a lot and no battery drainage issues. any ideas?
Instructor
Joined: Aug 2022
Posts: 243
Likes: 93
From: Ashburn, VA
The guages on these cars are "references" at best. I'd put a volt meter on the alternator positive terminal with the car running and verify what the output voltage is. I'm new to C5s but old to Chevys. I'm learning that these cars complain about EVERYTHING 
. I am suspecting the new alternator though...Did you replace it with a higher AMP output unit? If so, that could be your issue (not really an issue...but the car is saying hey...we are programmed to see 100 Amps, and we are seeing 110 amps when the system is loaded up [stereo, wipers, ecm, a/c, etc]). As long as the batt is charging and you dont smell smoke...I'd say send it my good man.
Joe
. I am suspecting the new alternator though...Did you replace it with a higher AMP output unit? If so, that could be your issue (not really an issue...but the car is saying hey...we are programmed to see 100 Amps, and we are seeing 110 amps when the system is loaded up [stereo, wipers, ecm, a/c, etc]). As long as the batt is charging and you dont smell smoke...I'd say send it my good man.Joe
Safety Car
Joined: Mar 2005
Posts: 3,735
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From: Wisconsin
Thread Starter
Le Mans Master
Joined: Oct 2005
Posts: 7,196
Likes: 386
From: Texas Where God intended me to be.
2023 Corvette of the Year Finalist - Unmodified
2022 C5 of the Year Winner - Unmodified
Cruise-In X Veteran
St. Jude Donor '08 thru '11,'22 thru '26
Read thru this sticky
https://www.corvetteforum.com/forums...nd-issues.html
https://www.corvetteforum.com/forums...nd-issues.html
Moderator, Tech Contributor
Joined: Sep 2013
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From: Cape Coral, Florida
Race Director
Joined: Apr 2007
Posts: 11,150
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From: South Western Ontario
Nice scope capture. I'd agree, GM gets stupid with start-up tolerances some times. Another example is anything Atlas engine equipped throwing a VVT code on cold start even through the VVT works fine once it's running.
Besides swapping the regulator, you can also tune it out so it just doesn't fault anymore. That's what I did with the Atlas, turn the code off and it worked fine.
Besides swapping the regulator, you can also tune it out so it just doesn't fault anymore. That's what I did with the Atlas, turn the code off and it worked fine.
Instructor
Joined: Aug 2022
Posts: 243
Likes: 93
From: Ashburn, VA
Nice scope capture. I'd agree, GM gets stupid with start-up tolerances some times. Another example is anything Atlas engine equipped throwing a VVT code on cold start even through the VVT works fine once it's running.
Besides swapping the regulator, you can also tune it out so it just doesn't fault anymore. That's what I did with the Atlas, turn the code off and it worked fine.
Besides swapping the regulator, you can also tune it out so it just doesn't fault anymore. That's what I did with the Atlas, turn the code off and it worked fine.
. The IPC gives the driver WAYYYYYYYYYYYYY MORE information then the average owner will ever, need, want, or be able to process. It is a god send for diagnostic though.
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Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,319
Likes: 3,927
From: Cape Coral, Florida
Nice scope capture. I'd agree, GM gets stupid with start-up tolerances some times. Another example is anything Atlas engine equipped throwing a VVT code on cold start even through the VVT works fine once it's running.
Besides swapping the regulator, you can also tune it out so it just doesn't fault anymore. That's what I did with the Atlas, turn the code off and it worked fine.
Besides swapping the regulator, you can also tune it out so it just doesn't fault anymore. That's what I did with the Atlas, turn the code off and it worked fine.
