U1101 on 2007-2009 Hyundai Entourage — Lost Communication (Manufacturer Specific)
1 vehicles · 1 makes · $200-$700 repair
Most Reported On
U1101 is an OBD-II diagnostic trouble code meaning “Lost Communication (Manufacturer Specific).” This is a manufacturer-specific network communication code meaning a module has lost communication with another module on the vehicle's data bus (the exact module varies by manufacturer, since U11xx codes are not standardized like generic U-codes). Vehicle modules talk to each other over a shared data network, and this code is logged when expected messages from a particular module stop arriving or the module fails to respond. Depending on which system is affected, you may see warning lights, disabled features, or reduced functionality. It generally indicates a wiring, connector, power/ground, or module problem on the communication network rather than a mechanical fault. Because the meaning is brand-specific, manufacturer service information is needed to identify the exact module involved. This code is most commonly reported on 2007-2009 Hyundai Entourage, with repair costs ranging from $200 to $700.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose U1101, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
FAQ
What does U1101 mean?
U1101 stands for "Lost Communication (Manufacturer Specific)." This is a manufacturer-specific network communication code meaning a module has lost communication with another module on the vehicle's data bus (the exact module varies by manufacturer, since U11xx codes are not standardized like generic U-codes). Vehicle modules talk to each other over a shared data network, and this code is logged when expected messages from a particular module stop arriving or the module fails to respond. Depending on which system is affected, you may see warning lights, disabled features, or reduced functionality. It generally indicates a wiring, connector, power/ground, or module problem on the communication network rather than a mechanical fault. Because the meaning is brand-specific, manufacturer service information is needed to identify the exact module involved.
What are the most common causes of U1101?
The most common causes of U1101 are: Damaged, corroded, or loose data bus wiring or connectors, Open or short in the CAN/communication wiring, Lost power or ground to the affected module, Blown fuse feeding a network module, Failed or unresponsive control module, Corrosion or water intrusion at a module connector, Another faulty module disrupting the data bus. The specific cause varies by vehicle.
How much does it cost to fix U1101?
Repair costs for U1101 range from $200 to $700, depending on the vehicle and root cause.
Which vehicles are affected by U1101?
Au7o has documented U1101 across 1 vehicle models from 1 manufacturers: Hyundai.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.