NetworkU1247
SeriousSeverity: Serious - have it checked soon
Loss of serial communications for class 2 devices
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 8
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | U1247 | No description available | Network |
| Daewoo | U1247 | Loss of serial communications for class 2 devices Brand | Network |
| EOBD | U1247 | Senzor obsahu častíc v A/C Brand | Network |
| GM | U1247 | Loss of serial communications for class 2 devices Brand | Network |
| Peugeot | U1247 | No description available | Network |
| Saab | U1247 | Loss of serial communications for class 2 devices Brand | Network |
| Smart | U1247 | No description available | Network |
| Sprinter | U1247 | 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 10
These 7-character codes are manufacturer-specific variants of U1247 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| SsangYong | U124787 | CAN communication: Electrical Brake Unit (EBU) message timeout (20A) Brand | Network |
| Mercedes-Benz | U1247E0 | Receive time-out, kein Datenempfang vom Master für eine bestimmte Zeitdauer. Brand | Network |
| Mercedes-Benz | U1247E1 | Die Folgenummer von Slave an Master ist nicht in der Reihenfolge. Brand | Network |
| Mercedes-Benz | U1247E4 | CRC Payload Error von Slave und Master. Brand | Network |
| Mercedes-Benz | U1247E5 | Die Gre von das Countiner ide von Slave an Master ist nicht kompatibel. Brand | Network |
| Mercedes-Benz | U1247E6 | Das Countiner ide von Slave an Master ist nicht definiert. Brand | Network |
| Mercedes-Benz | U1247E8 | Software lockstep runtime error master to slave dectected on master Brand | Network |
| Mercedes-Benz | U1247E9 | Software lockstep runtime error slave to master dectected on master Brand | Network |
| Mercedes-Benz | U1247EA | Software lockstep end-to-end protection error dectected on master Brand | Network |
| Mercedes-Benz | U1247EB | Anzahl der fehlgeschlagenen Transmission an Slave versucht. Brand | Network |
6Related codes
Browse Uxxx codes or U124xx codes.