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HVAC - No Comm - Works fine?

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Old Apr 13, 2026 | 12:59 PM
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Default HVAC - No Comm - Works fine?
I replaced the HVAC unit with a new OEM part. I performed the learning process and everything works fine. While I was working thru some non-related issues, I pulled the codes and have an HVAC No Comm code. I'm just going to leave it alone, but wonder what the code is from? Any ideas?

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Old Apr 13, 2026 | 02:09 PM
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So I take it you did not disconnect the battery before swapping the control panel?
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Old Apr 13, 2026 | 02:25 PM
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If it is a "history" DTC just erase it...are using the DIC or a scan tool ??
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Old Apr 13, 2026 | 02:52 PM
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Originally Posted by C5 Diag
If it is a "history" DTC just erase it...are using the DIC or a scan tool ??
(DIC) It's not an H or C code, just says "HVAC NO COMM." FYI the battery has been disconnected for about three days for another issue.
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Old Apr 13, 2026 | 02:58 PM
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Originally Posted by lucky131969
So I take it you did not disconnect the battery before swapping the control panel?
I followed the instructions. Disconnect batt, swap unit out, reconnect batt, turn ignition on, wait for new unit to stop blinking.
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Old Apr 13, 2026 | 02:58 PM
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Originally Posted by jcgunn
(DIC) It's not an H or C code, just says "HVAC NO COMM." FYI the battery has been disconnected for about three days for another issue.
How about just taking a screen shot of what you see...history U code DTC's will clear after 50 ignition cycles with no failures.
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