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 wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
U0129Lost Communication With Brake System Control Module 1U0129Lost Communication With Brake System Control Module 1U0129-00Lost Communication With Brake System Control ModuleManufacturer communications
16Original wording in English
HYUNDAI
Reported code forms U012987
Certain Palisade Hybrid (LX3 HEV) vehicles may illuminate the Malfunction Indicator Lamp (MIL) and display a false “Check Hybrid System” warning message after use of Bluelink Remote Start following extended parking…
HYUNDAI
Reported code forms U012987
Certain Palisade Hybrid (LX3 HEV) vehicles may illuminate the Malfunction Indicator Lamp (MIL) and display a false “Check Hybrid System” warning message after use of Bluelink Remote Start following extended parking…
JEEP
Reported code forms U0129-00
Not applicable to vehicles built for US market. Multiple Systems Repair Bundle Campaign Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the…
JEEP
Reported code forms U0129
Symptoms/Condition: Shifter reports loss communication AND NO OTHER MODULES report the condition. Diagnostic: Please make sure ONLY shifter reports loss communication. If there are other modules reporting loss…
AUDI
Reported code forms U012900
This bulletin rpovides information when the gear cannot be selected in cold weather (DTCs U303500; U029400; U012900).
AUDI
Reported code forms U012900
This TSB provides information when the gear cannot be selected in cold weather ( DTCs : U303500;U029400;U012900 ).
Check vehicle applicability
38A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Audi | A5 | 2025 |
| Audi | A6 SPORTBACK E-TRON | 2025 |
| Audi | Q5 | 2025 |
| Audi | Q6 E-TRON | 2025 |
| Audi | Q6 SPORTBACK E-TRON | 2025 |
| Audi | S5 | 2025 |
| Audi | S6 SPORTBACK E-TRON | 2025 |
| Audi | SQ5 | 2025 |
| Audi | SQ6 E-TRON | 2025 |
| Audi | SQ6 SPORTBACK E-TRON | 2025 |
| Chevrolet | SILVERADO 1500 | 2020 |
| Chevrolet | SILVERADO 1500 | 2019 |
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.