What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
Manufacturer communications
24Original wording in English
CADILLAC, CHEVROLET, GMC
Reported code forms U0028 U0028-88
This PI communicates an issue where the Brake System Control Module DTC: U0028-88 and U0037-88 diagnostics are backwards and follow the diagnostic procedure for U0037 if U0028 is set and vice versa.
CADILLAC, CHEVROLET, GMC
Reported code forms U0028 U0028-88
This PI communicates an issue where the Brake System Control Module DTC: U0028-88 and U0037-88 diagnostics are backwards and follow the diagnostic procedure for U0037 if U0028 is set and vice versa.
AUDI
Reported code forms U002800
This bulletin provides information when there is an MHEV Electrical System Fault with DTC U046900 / 34763; U002900/U002800.
AUDI
Reported code forms U002800
This bulletin provides information when there is an MHEV Electrical System Fault with DTC U046900 / 34763; U002900/U002800.
ISUZU
Reported code forms U0028
Dealers, upfitters or bodybuilders may notice various warning lights on the dash illuminating and certain DTCs without an apparent cause during the initial installation and connection of telematics, GPS, and/or other…
AUDI
Reported code forms U002800
This bulletin contains repair instructions for when there is a wiring harness that has been chafed, DTCs U121C00, U011000, U003600, U002800, U002900, U140500, P0A2F00, and/or P0A1B00 may be stored.
Check vehicle applicability
412A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Audi | A6 | 2023 |
| Audi | A6 | 2022 |
| Audi | A6 | 2021 |
| Audi | A6 | 2020 |
| Audi | A6 | 2019 |
| Audi | A6 ALLROAD | 2023 |
| Audi | A6 ALLROAD | 2022 |
| Audi | A6 ALLROAD | 2021 |
| Audi | A6 ALLROAD | 2020 |
| Audi | A7 | 2023 |
| Audi | A7 | 2022 |
| Audi | A7 | 2021 |
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.