NetworkU1DD3
SeriousSeverity: Serious - have it checked soon
No description available
Key terms: Control module: a small computer that runs one part of the car
1What it means in plain English
Control modules in the car cannot communicate with each other over the vehicle network.
2Common causes
- Wiring or connector fault on the communication bus
- Faulty control module
- Low battery voltage or poor ground
- Water ingress in a connector or module
- Aftermarket device interfering with the bus
3Can I drive?
The car may run normally or may not run at all. If the module that has lost communication controls steering, brakes, park brake, charging or engine cooling, drive only if those systems feel normal; stop safely if the steering becomes heavy, a brake warning appears, or the engine temperature climbs. If the car will not start or runs badly, have it towed.
This page gives general information. It is not professional advice. For a definite diagnosis and a repair quote, ask a qualified mechanic to inspect the car.
4Brand data 1
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | U1DD3 | No description available | Network |
Legend: SAE is the generic J2012 description; Brand is text taken from that manufacturer’s data. Manufacturer rows keep the wording and language of the source data, and non-English text is tagged so screen readers pronounce it correctly.
5Extended variant codes 36
These 7-character codes are manufacturer-specific variants of U1DD3 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | U1DD301 | Manufacturer Controlled DTC - The pump failure in SOPT of slave path Brand | Network |
| Mercedes-Benz | U1DD302 | Redundant Current Measurement Uncalibrated Fault Brand | Network |
| Mercedes-Benz | U1DD303 | ASIC internal errors Brand | Network |
| Mercedes-Benz | U1DD304 | CellVoltage Implausible Brand | Network |
| Mercedes-Benz | U1DD305 | Pack Voltage Implausible Brand | Network |
| Mercedes-Benz | U1DD306 | Terminal Voltage Implausible Brand | Network |
| Mercedes-Benz | U1DD307 | Manufacturer Controlled DTC -Diagnosis of GND loss Brand | Network |
| Mercedes-Benz | U1DD308 | Manufacturer Controlled DTC - Diagnosis of KL30 over voltage Brand | Network |
| Mercedes-Benz | U1DD312 | CMM internal errors Brand | Network |
| Mercedes-Benz | U1DD313 | CMM Measurement value stuck Brand | Network |
| Mercedes-Benz | U1DD314 | Circuit Breaker Damaged - Stuck Open Critical Brand | Network |
| Mercedes-Benz | U1DD315 | SBC_SPI Timeout Brand | Network |
| Mercedes-Benz | U1DD318 | ADuC Timer wakeup Error Brand | Network |
| Mercedes-Benz | U1DD319 | ADuC CEB counter wakeup Error Brand | Network |
| Mercedes-Benz | U1DD320 | Nfault wakeup error Brand | Network |
| Mercedes-Benz | U1DD321 | Critical Error Bit Brand | Network |
| Mercedes-Benz | U1DD322 | No description available | Network |
| Mercedes-Benz | U1DD323 | No description available | Network |
| Mercedes-Benz | U1DD324 | ADUC SPIError Brand | Network |
| Mercedes-Benz | U1DD325 | LiBB Power Supply Error - PMIC WDG Test Error Brand | Network |
| Mercedes-Benz | U1DD326 | Terminal Voltage Stuck at constant Brand | Network |
| Mercedes-Benz | U1DD327 | ADuC detailed error-Battery current error Brand | Network |
| Mercedes-Benz | U1DD328 | ADuC detailed error-Pack voltage error Brand | Network |
| Mercedes-Benz | U1DD329 | ADuC detailed error-T30 voltage error Brand | Network |
| Mercedes-Benz | U1DD330 | CAN Transceiver Error Brand | Network |
| Mercedes-Benz | U1DD331 | PMIC SPI lost Brand | Network |
| Mercedes-Benz | U1DD332 | Security core Error Brand | Network |
| Mercedes-Benz | U1DD333 | Microcontroller DMA Error Brand | Network |
| Mercedes-Benz | U1DD334 | Charge Over Current (iSCP) Brand | Network |
| Mercedes-Benz | U1DD335 | Charge Over Current (iSCP) in critical temperature Brand | Network |
| Mercedes-Benz | U1DD336 | Critical End Of Life Reached Brand | Network |
| Mercedes-Benz | U1DD339 | Persistent SBC_SPI Timeout Error Brand | Network |
| Mercedes-Benz | U1DD340 | Serial number Incorrect Brand | Network |
| Mercedes-Benz | U1DD379 | No description available | Network |
| Mercedes-Benz | U1DD380 | No description available | Network |
| Mercedes-Benz | U1DD381 | No description available | Network |
6Related codes
Browse Uxxx codes or U1DDxx codes.