U011F

Code

Generic U — Network/User

Lost Communication With V2X Module

Brand: Generic

Type: U — Network/User

Views: UK: 30 EN: 54 RU: 30

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

V2X module powered down, asleep, or failed
Loss of power or ground to the V2X module (fuse, wiring, connector)
Open or short on the data bus (CAN/CAN-FD, Ethernet, or LIN as applicable)
Intermittent connector or wiring fault between gateway and V2X unit
Module software fault or incompatible software/version
Network termination or bus configuration problems

Symptoms

DTC U011F stored; possible MIL or network warning on dash
Loss of V2X-related messages or features (e.g., hazard warnings, message alerts)
Inconsistent or no V2X telemetry shown in the telematics or diagnostic tool
Intermittent communications or features that work unpredictably
Related network nodes may set additional U0xx COMM codes

What to check

Scan network with a capable scan tool: read U011F freeze frame and pending codes
Check ignition state and cycle power to attempt to clear transient faults
Verify fuses and relay(s) supplying V2X module power
Visually inspect V2X module connector and wiring for damage or corrosion
Check module power and ground voltages with key on and cranking as required
Check for presence of expected messages on the vehicle bus with a capable scan tool

Signal parameters

V2X heartbeat/keepalive frequency (expected message interval)
CAN/CAN-FD IDs used by the V2X module and message rate (Hz or ms)
Bus idle voltages (CAN H ~2.5V, CAN L ~2.5V) and differential voltage (~2.5V when active)
Termination resistance across CAN H and CAN L (~60 Ω)
Power supply voltage to V2X module (battery voltage with ignition states)
Module ground resistance to chassis (

Diagnostic algorithm

Record freeze frame and all stored U-codes. Note ignition state and event timing.
Verify simple causes: check V2X-related fuses, relays, and battery connection; correct as needed.
With ignition ON, use a scan tool to request V2X module identity/ping. Document any response or timeout.
Visually inspect connectors and wiring to the V2X module and gateway. Unplug/reconnect connectors to reseat; inspect pins.
Measure module power and ground pins at the connector (key ON). If power/ground missing or out of range, trace supply wiring and fuses.
Check network traffic: monitor CAN/CAN-FD or Ethernet for expected V2X messages and heartbeat using a bus analyzer or scan tool. Note message IDs and rates.
If no messages, test CAN lines for continuity and shorts to battery/ground; measure differential signal with oscilloscope while a node transmits.
Verify termination resistors and proper network topology (replace/repair missing termination).
If bus looks healthy but module does not respond, attempt a module power-cycle and re-scan. If possible, reflash/update module software to correct known bugs.
Swap or bench-test the V2X module if available (observe workshop procedures) or replace module if confirmed failed. After repair, clear codes and verify normal message flow and code does not return after test drive.
If multiple network nodes show communication issues, inspect gateway/ECU and bus transceiver devices; consult manufacturer network diagrams for further tracing.

Likely causes

Blown fuse or poor battery connection feeding the V2X module
Corroded or loose connector at the V2X module or gateway
Damaged CAN high/low wires (chafing, pinched, rodent damage)
V2X module firmware crash or failed start-up after update
Incorrect or missing bus termination resistor after aftermarket work
Short/low resistance on CAN bus to chassis ground or vehicle battery

Fault status

⚠️ Status

Lost communication with V2X module. The vehicle network gateway/ECU did not receive expected messages/heartbeats from the V2X unit. Verify power, ground, connectors, and data bus integrity before replacing modules.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-3.0 hours