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Old Oct 20, 2022 | 11:15 AM
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What is the meaning of U2209 error code?
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Old Oct 20, 2022 | 11:50 AM
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Originally Posted by pistolpete817
What is the meaning of U2209 error code?
I looked it up and it is generic
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Old Oct 20, 2022 | 12:04 PM
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It is a result of a oxygen sensor. Something to do with fuel/air mixture. It is not specific to the C8. And not catastrophic. It may cycle off on its own. But if it stays on I'd make the dreaded trip to the service drive.

FYI Easy to google error codes.
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Old Oct 20, 2022 | 12:20 PM
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Originally Posted by papillion
It is a result of a oxygen sensor. Something to do with fuel/air mixture. It is not specific to the C8. And not catastrophic. It may cycle off on its own. But if it stays on I'd make the dreaded trip to the service drive.

FYI Easy to google error codes.
Thanks. I didn't think of that.
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Old Oct 20, 2022 | 12:30 PM
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Happened to me on my way home to Texas from Bowling Green delivery. It did cycle out. Although I called OnStar and they said OK to drive home and take it to the dealer when you get home. But the code cycled out and I skipped the dealer visit.
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Old Oct 20, 2022 | 02:31 PM
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Originally Posted by pistolpete817
What is the meaning of U2209 error code?
How did you come across this code? I looked for it in the 2020 Service Manual. It shows a range of codes between U2200 and U23FF, in the table of DTCs. In column next to it, with a column header "diagnostic procedures" it simply says "Data Communications" with no further detail. Searching U2209, no diagnostic procedure is found.




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Old Oct 20, 2022 | 03:34 PM
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Originally Posted by Andybump
How did you come across this code? I looked for it in the 2020 Service Manual. It shows a range of codes between U2200 and U23FF, in the table of DTCs. In column next to it, with a column header "diagnostic procedures" it simply says "Data Communications" with no further detail. Searching U2209, no diagnostic procedure is found.


OBD II reader Creader CRP123 showed the code. It showed up several times as an historic code. But it was cleared now.
After the suggestion to ask Google, I found a good but general meaning at https://diagnostictrouble.com/obdii-code/u2209.
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