NetworkU186B
SeriousSeverity: Serious - have it checked soon
Lost Communication with Transmission Control Module
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 6
| Brand | Code | Description | System |
|---|---|---|---|
| Daewoo | U186B | No description available | Network |
| GM | U186B | No description available | Network |
| Holden | U186B | Lost Communication with Transmission Control Module Brand | Network |
| Opel | U186B | No description available | Network |
| Peugeot | U186B | No description available | Network |
| Saab | U186B | 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 6
These 7-character codes are manufacturer-specific variants of U186B and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | U186B29 | Das Signal HOSWD_HandsOn_Stat_Master_ST3 oder HOSWD_System_Stat_Master_ST3 oder INP_HOSWD_System_Stat_Master oder HOSWD_DAS_HandsOn_Dtct_Raw_ST3 vom HOSWD-Steuergerät wird mit einem ungültigem Wert empfangen Brand | Network |
| Mercedes-Benz | U186B41 | Botschaften vom HOSWD_Steuergerät zeigen einen Fehler im Botschaftszähler oder CRC-Fehler Brand | Network |
| Mercedes-Benz | U186B82 | Communication with control unit 'HAND DETECTION SYSTEM' or control unit 'Mercedes-Benz Intelligent Drive' has a malfunction. Counter error. Brand | Network |
| Mercedes-Benz | U186B83 | Communication with control unit 'HAND DETECTION SYSTEM' or control unit 'Mercedes-Benz Intelligent Drive' has a malfunction. CRC error. Brand | Network |
| Mercedes-Benz | U186B86 | Das Signal HOSWD_HandsOn_Stat_Master_ST3 wird vom HOSWD-Steuergerät wird mit einem ungültigen Wert empfangen. Brand | Network |
| Mercedes-Benz | U186B87 | Botschaft vom HOSWD_SG wird zeitweise nicht empfangen Brand | Network |
6Related codes
Browse Uxxx codes or U186xx codes.