NetworkU1103
SeriousSeverity: Serious - have it checked soon
Production mode active
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 31
| Brand | Code | Description | System |
|---|---|---|---|
| BAIC Motor | U1103 | Received TCU signal abnormal Brand | Network |
| Mercedes-Benz | U1103 | No description available | Network |
| BYD | U1103 | Lost communication with SRS Brand | Network |
| Chery | U1103 | PDC CAN timeout/Not equipped Brand | Network |
| Daewoo | U1103 | Loss of serial communications for class 2 devices Brand | Network |
| Daihatsu | U1103 | Idle stop ECU Brand | Network |
| DFFX | U1103 | PDC CAN timeout/Not equipped Brand | Network |
| EOBD | U1103 | Üretim modu Brand | Network |
| Geely | U1103 | PDC CAN timeout/Not equipped Brand | Network |
| GM | U1103 | Loss of serial communications for class 2 devices Brand | Network |
| Great Wall | U1103 | PDC CAN timeout/Not equipped Brand | Network |
| Hafei | U1103 | PDC CAN timeout/Not equipped Brand | Network |
| Holden | U1103 | No description available | Network |
| Honda | U1103 | No description available | Network |
| Hyundai | U1103 | No description available | Network |
| Isuzu | U1103 | No description available | Network |
| Mahindra | U1103 | No description available | Network |
| Mitsubishi | U1103 | ASC timeout/Not equipped Brand | Network |
| Opel | U1103 | Loss of serial communications for class 2 devices Brand | Network |
| Perodua | U1103 | Idle stop ECU Brand | Network |
| Peugeot | U1103 | No description available | Network |
| Porsche | U1103 | No description available | Network |
| Proton | U1103 | ASC timeout/Not equipped Brand | Network |
| Saab | U1103 | Loss of serial communications for class 2 devices Brand | Network |
| MG (SAIC) | U1103 | CAN configuration mismatch Brand | Network |
| Smart | U1103 | No description available | Network |
| Sprinter | U1103 | No description available | Network |
| Suzuki | U1103 | No description available | Network |
| Tata | U1103 | ECU Interior Communication Abnormal/Communication Error A Brand | Network |
| Toyota | U1103 | Production mode active Brand | Network |
| Volkswagen | U1103 | Production Mode active; Short to ground Brand | 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 5
These 7-character codes are manufacturer-specific variants of U1103 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Porsche | U110300 | No description available | Network |
| Volkswagen | U110300 | Production mode active Brand | Network |
| SsangYong | U110302 | CAN communication: BS_20A communication error - timeout Brand | Network |
| SsangYong | U110317 | Battery voltage value too high Brand | Network |
| SsangYong | U110387 | CAN communication: Vehicle Control Unit (VCU) message not received Brand | Network |
6Related codes
Browse Uxxx codes or U110xx codes.