U1101 on Hyundai
Lost Communication (Manufacturer Specific)
U1101 on Hyundai vehicles indicates lost communication (manufacturer specific). Au7o has documented this code across 1 Hyundai model — most commonly on Entourage. 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. Typical repair costs on Hyundai range from $200 to $700, depending on the specific model and root cause.
Common Causes of U1101
- •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
U1101 on Hyundai by Model
Hyundai Entourage(1 issue)
- 3.8L V6 Alternator and Battery Drain Issues2007-2009
The Entourage 3.8L V6 shares the same high alternator failure rate as other Lambda V6 Hyundai vehicles. The alternator fails prematurely between 60,000-80,000 miles. Additionally, the Entourage suffers from parasitic battery drain caused by the power sliding door modules not fully entering sleep mode. This drains the battery overnight if the vehicle sits for more than 2-3 days. The combination of alternator weakness and parasitic drain frequently results in dead batteries and stranded owners.
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View U1101 across all makes →Frequently Asked Questions
What does U1101 mean on Hyundai?▼
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. On Hyundai specifically, this code is documented across 1 model.
What causes U1101 on Hyundai vehicles?▼
Common causes on Hyundai: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix U1101 on a Hyundai?▼
Repair costs on Hyundai range from $200 to $700, depending on the specific model and root cause.
Which Hyundai models have U1101 documented?▼
Au7o has documented U1101 on 1 Hyundai model: Entourage.