NetworkU0291
SeriousSeverity: Serious - have it checked soon
Lost Communication With Gear Shift Control Module B
Key terms: Control module: a small computer that runs one part of the car · SAE J2012: the standard generic code list
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 25
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | U0291 | Cylinder 6. Pressure Too Low Brand | Network |
| BAIC Motor | U0291 | Lost Communication With Gear Shift Control Module B Brand | Network |
| BYD | U0291 | Lost communication with SCU fault Brand | Network |
| Chery | U0291 | Lost communication with shift panel controller Brand | Network |
| Daewoo | U0291 | Lost Communication With Gear Shift Control Module B Brand | Network |
| DFFS | U0291 | GBC CAN communication lost fault Brand | Network |
| DFFX | U0291 | Lost Communication With Gear Shift Control Module B Brand | Network |
| DFXK | U0291 | Lost Communication With Gear Shift Control Module B Brand | Network |
| EOBD | U0291 | Kaotatud side käiguvahetuse juhtmooduliga B Brand | Network |
| Geely | U0291 | Lost Communication With Gear Shift Control Module B Brand | Network |
| GM | U0291 | Lost Communication With Gear Shift Control Module B Brand | Network |
| Great Wall | U0291 | Lost Communication With Gear Shift Control Module B Brand | Network |
| Hafei | U0291 | Lost Communication With Gear Shift Control Module B Brand | Network |
| Honda | U0291 | Lost Communication With Gear Shift Control Module B SAE | Network |
| Hyundai | U0291 | Lost Communication With Gear Shift Control Module B SAE | Network |
| Isuzu | U0291 | Lost Communication With Gear Shift Control Module B SAE | Network |
| Land Rover | U0291 | Lost Communication With Gear Shift Control Module B SAE | Network |
| Nissan | U0291 | Lost Communication With Gear Shift Control Module B SAE | Network |
| Opel | U0291 | Lost Communication With Gear Shift Control Module B Brand | Network |
| Peugeot | U0291 | Lost Communication With Gear Shift Control Module B SAE | Network |
| Proton | U0291 | Lost Communication With Gear Shift Control Module B SAE | Network |
| Saab | U0291 | Lost Communication With Gear Shift Control Module B Brand | Network |
| MG (SAIC) | U0291 | Lost Communication With Gear Shift Control Module B Brand | Network |
| Suzuki | U0291 | Lost Communication With Gear Shift Control Module B SAE | Network |
| Toyota | U0291 | Electronic shift controller (GBC) CAN communication lost 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.
5Related codes
Browse Uxxx codes or U029xx codes.