AI DamageU0029 code: Vehicle Communication Bus A Performance
Code U0029 is named in 4 US owner complaints. Models: 4, model years 2009–2020.
What the code means
Vehicle Communication Bus A Performance. Generic meaning per SAE J2012 (the same for all makes).
How to read U0029: the letter U means network communication between modules; the second digit 0 marks a generic SAE code shared by all makes; the last three characters 029 identify the specific fault.
Lost communication codes (U0xxx) mean one module cannot hear another on the data bus. The cause can be the module itself, its power or ground, or a damaged wiring harness. After a crash this is a typical trace: the impact tears wiring in the rail, fender or rocker and modules drop off the network.
Key figures
- Complaints with this code
- 4
- Models
- 4
- Model years
- 2009–2020
Which models and years
Models whose owners name this code (4). Years link to the model year problems page.
Components named together with the code
Component as the owner filed it (one complaint can list several).
Complaints by model year
What to do if an auction car has this code
- Check wiring harnesses in the impact zone: rail, fender, rocker, pillar.
- Check the battery and grounds: low voltage triggers false lost communication codes.
- Budget a network scan: a missing module may be intact while its wiring is damaged.
What owners report
Excerpts of owner complaints in the original wording. Owner statements not verified by the regulator; personal data removed.
Engine permanent codes U0111 U012D U0110 U12A5 U1206 U1205 Anti lock brakes permanent codes U040168 CAN Gateway Permanent codes U0029-00 Electric power train traction motor control module permanent code U1204 U12A5 U1205 U0100 U012D U1206 U0111 Electric power steering permanent codes U0416-68 Electric servo brake -…
U0029-00 vehicle communication bus a performance issue #9 with my honda. Please help
Related codes
- U3000Control Module
- U0073Control Module Communication Bus A Off
- U0140Lost Communication With Body Control Module
- U3003Battery Voltage
- U0001High Speed CAN Communication Bus
- U0422Invalid Data Received From Body Control Module
- U0002High Speed CAN Communication Bus Performance
- U0146Lost Communication With Serial Data Gateway…
- U0141Lost Communication With Body Control Module A
- U3006Control Module Input Power A Circuit/Open
- U0010Medium Speed CAN Communication Bus
- U3001Control Module Improper Shutdown Performance
Sources: public official US data (owner complaints) and the SAE J2012 standard. Complaints are owner statements not verified by the regulator. A code from a complaint does not replace a scan tool diagnosis. Data updated 2026-11-10.