Codes
Thread Starter
Melting Slicks
Joined: Jun 2017
Posts: 2,568
Likes: 1,183
From: Conyers Georgia
Codes
Most of us know how to find our codes and look up what they mean. My question is is there a list of codes that each module CAN produce? I'm asking because after much trouble shooting of my ac blower operation and not getting any codes at all either in the DIC or my scanner I have concluded that there is a vacuum line that is either loose or broken. My specific question is would a vacuum leak give a code? I'm thinking not hence the entire code list for the hvac module
Melting Slicks
Joined: Sep 2021
Posts: 2,555
Likes: 1,213
The service manual index has a list of codes. Seems like that should be the complete list, otherwise if an unlisted code came up the tech would have to hunt in that section of the service manual.
This is one of the .pdf files from the downloadable manual pinned in the C5 general area:
This is one of the .pdf files from the downloadable manual pinned in the C5 general area:
Thread Starter
Melting Slicks
Joined: Jun 2017
Posts: 2,568
Likes: 1,183
From: Conyers Georgia
Both are great lists so if they are a complete listing and I get none of the hvac codes it has to be either the vacuum leak or maybe the controller, while changing images in the mode selector setting isn't actually signalling the actuators.............but that would trigger a code..?
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,498
Likes: 3,999
From: Cape Coral, Florida
Most of us know how to find our codes and look up what they mean. My question is is there a list of codes that each module CAN produce? I'm asking because after much trouble shooting of my ac blower operation and not getting any codes at all either in the DIC or my scanner I have concluded that there is a vacuum line that is either loose or broken. My specific question is would a vacuum leak give a code? I'm thinking not hence the entire code list for the hvac module
Thread Starter
Melting Slicks
Joined: Jun 2017
Posts: 2,568
Likes: 1,183
From: Conyers Georgia
I didn't think a vacuum leak would set a code because it's not an electrical malfunction and since I have no codes I'm even more convinced that's where my issue is. That has to be the easiest to diagnose as all it takes is a smoke machine.....scheduled to have that done on Monday. It hit 105 here today. Left the garage (shade) after running the AC. The ceramic tint helps big time and the car stayed cool. After being parked for 30 minutes though it was warm when I got back in.......
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,498
Likes: 3,999
From: Cape Coral, Florida
I didn't think a vacuum leak would set a code because it's not an electrical malfunction and since I have no codes I'm even more convinced that's where my issue is. That has to be the easiest to diagnose as all it takes is a smoke machine.....scheduled to have that done on Monday. It hit 105 here today. Left the garage (shade) after running the AC. The ceramic tint helps big time and the car stayed cool. After being parked for 30 minutes though it was warm when I got back in.......
Thread Starter
Melting Slicks
Joined: Jun 2017
Posts: 2,568
Likes: 1,183
From: Conyers Georgia
Wasn’t your issue an airflow problem ???…I think you said you had a scan tool…with the engine at idle what are your long and short term fuel trims…with a possible vacuum leak I would expect your fuel trims to be elevated…if fuel trims are elevated raise the RPM and see if short terms go negative and long terms slowly decrease signifying a leak.
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