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.
U0442:00[TCM] Invalid data received from PCMManufacturer communications
7Original wording in English
MERCEDES-BENZ
Reported code forms U044229
Complaint Either during PDI or after updating vehicle software, there may be: • "A+S" - Active and Stored DTC • "S" - Stored DTC Some known erroneous DTC's are: • C1016E0 with error ID: SIG_ESP_71 • B15BF00 with error…
MERCEDES-BENZ
Reported code forms U044229
Complaint Either during PDI or after updating vehicle software, there may be: • "A+S" - Active and Stored DTC • "S" - Stored DTC Some known erroneous DTC's are: • C1016E0 with error ID: SIG_ESP_71 • B15BF00 with error…
MAZDA
Reported code forms U0442
Some vehicles may display some (or all) of the following symptoms: • Check engine light on with DTC P061B • Light increase in engine rpms during acceleration • Transmission will not shift past 4th gear • Various U codes…
MERCEDES-BENZ
Reported code forms U044287
Complaint Check engine light comes on when driving/starting the vehicle. No drivability concerns. Cause SW conflict of the 48V battery Remedy 1.-Check for SW in the 48V battery. 1. If SW is available, update the 48V…
MAZDA
Reported code forms U0442
Some vehicles may display some (or all) of the following symptoms: Check engine light on wit DTC P061B Surging on acceleration Transmission will not shift past 4th gear Various U codes (U0401 ABS, U0401, U0415 FSC,…
MAZDA
Reported code forms U0442
Some vehicles may display some (or all) of the following symptoms: Check engine light on wit DTC P061B, Surging on acceleration, Transmission will not shift past 4th gear, Various U codes (U0401 ABS, U0401, U0415 FSC,…
Check vehicle applicability
43A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Mazda | !MX-5 | 2019 |
| Mazda | CX-3 | 2019 |
| Mazda | CX-5 | 2025 |
| Mazda | CX-5 | 2024 |
| Mazda | CX-5 | 2023 |
| Mazda | CX-5 | 2022 |
| Mazda | CX-5 | 2021 |
| Mazda | CX-5 | 2020 |
| Mazda | CX-5 | 2019 |
| Mazda | CX-5 | 2018 |
| Mazda | MAZDA6 | 2018 |
| Mercedes-Benz | AMG CLA35 | 2024 |
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.