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B374A-61 Code Error

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Old Apr 11, 2026 | 03:49 PM
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Default B374A-61 Code Error

Hi everyone, about 2-3 days ago I replaced the starter motor, and the battery was disconnected, and it went flat. After replacing the starter motor and installing a new battery with improved parameters (60AH -> 77AH), I noticed that there was no air coming from the driver's overhead vent. The passenger's air conditioning is working and cooling, but there's no air coming out. The error I'm getting is: B374A-61 Airflow Control Feedback Circuit Stuck. I've tried restarting and recalibrating, but I can't. How do I do it? How do I approach this problem? Everything was working just a moment ago, but the thought of disassembling the entire dashboard, as I've read on the forum, terrifies me. In Poland, probably few people would do this.

Thanks in advance for your help. If this is wrong place, please moderator move it. Thanks and sorry.

Last edited by veneficus; Apr 11, 2026 at 04:00 PM.
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Old Apr 11, 2026 | 06:19 PM
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The vent blend door is known for failing, lets hope not. How did the installation of the new battery go? There is a little black wire that needs to be connected correctly. Could some of the A/C settings have dropped out when you removed the battery?
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Old Apr 11, 2026 | 06:33 PM
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Originally Posted by kodpkd
The vent blend door is known for failing, lets hope not. How did the installation of the new battery go? There is a little black wire that needs to be connected correctly. Could some of the A/C settings have dropped out when you removed the battery?
I checked the battery, the cable is there, everything else works properly, charging is working normally, I think it happened between disconnecting the battery, etc. The old battery was OK, 1 year old, but it was simply too weak, judging by the specifications. Everything else works fine, there is no information about low voltage or other errors. When my battery was discharged by the starter, the air conditioning could have been turned on. but i dont know, i will try tommorow to recalibrate it again.
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Old Apr 11, 2026 | 08:44 PM
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Moved to C7 Tech for continued discussion.
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Old Apr 11, 2026 | 09:33 PM
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Have you unhooked the new battery for a few minutes.
If not unhooked and see if it resets.
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Old Apr 12, 2026 | 01:59 PM
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Yes, I disconnected the battery and tried the method of removing the fuse number 17, but after starting the engine, I don't hear anything that seems to be calibrating there.
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Old Apr 13, 2026 | 04:04 AM
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Originally Posted by LT1 Z51
Well it sounds like its at the very least a wiring issue. So I wouldn't assume the HVAC assembly is bad yet. But check your wiring. Did you make sure the small ground wire was still attached then you swapped the battery? Double check all wiring.
I will check it again, but when i changing the battery i do not remove this black ground wire, I just use this one left screw.
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Old Apr 13, 2026 | 09:03 AM
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I don't want to sound condensending but you didn't by chance connect the battery polarity in reverse or possibly shorted the positive terminal causing a large ark resulting in a voltage spike?

Long shot I know, just a thought.

When a problem occurs always go back to the last thing you did.

Best of luck.
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Old Apr 16, 2026 | 08:42 AM
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Hi, not a chance to make a large ark, I'm doing it all by myself, and also an error occurred before charging the battery.

Some mechanics run recalibration two times from the computer, but nothing works. So, probably need to get out of the dash. Some mechanic told me to take out the dash it will be 600 usd so not that bad.


Thank you guys for the help.
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Old Apr 16, 2026 | 08:58 AM
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Just to be sure we are all talking about the same small wire look at the first picture in this thread.
Ground wire on battery - CorvetteForum - Chevrolet Corvette Forum Discussion
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Old Apr 16, 2026 | 09:43 AM
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Originally Posted by CraigStu
Just to be sure we are all talking about the same small wire look at the first picture in this thread.
Ground wire on battery - CorvetteForum - Chevrolet Corvette Forum Discussion
Yes this ground wire is fine. And do not deatch it for replacing the batter, only unscrew the other second one screw.
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