Error code U0029
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AudiWorld Newcomer
Joined: May 2025
Posts: 1
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Error code U0029
Hi!
I've got a -16 A6 3.0 TDI Quattro with the AdBlue-system coded away.
A while ago i got the check engine light with the error code U0029, Vehicle Communication Bus A Performance.
I dropped it of to Audi and they didn't find anything wrong with it, they said that the've checked the signals and everythings fine, even tried to replace the NOx-sensor that other pages suggested without any success.
Has anyone experienced this code and what was the solution?
I've got a -16 A6 3.0 TDI Quattro with the AdBlue-system coded away.
A while ago i got the check engine light with the error code U0029, Vehicle Communication Bus A Performance.
I dropped it of to Audi and they didn't find anything wrong with it, they said that the've checked the signals and everythings fine, even tried to replace the NOx-sensor that other pages suggested without any success.
Has anyone experienced this code and what was the solution?
AudiWorld Newcomer
Joined: Jan 2026
Posts: 1
Likes: 0
Hi!
I've got a -16 A6 3.0 TDI Quattro with the AdBlue-system coded away.
A while ago i got the check engine light with the error code U0029, Vehicle Communication Bus A Performance.
I dropped it of to Audi and they didn't find anything wrong with it, they said that the've checked the signals and everythings fine, even tried to replace the NOx-sensor that other pages suggested without any success.
Has anyone experienced this code and what was the solution?
I've got a -16 A6 3.0 TDI Quattro with the AdBlue-system coded away.
A while ago i got the check engine light with the error code U0029, Vehicle Communication Bus A Performance.
I dropped it of to Audi and they didn't find anything wrong with it, they said that the've checked the signals and everythings fine, even tried to replace the NOx-sensor that other pages suggested without any success.
Has anyone experienced this code and what was the solution?
Hi
I have the same problem. Did you find a solution or got it fixed?
thank you
Erik
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