Code
U0163
HYUNDAI
U — Network/User
Lost Communication With Navigation Control Module
Views:
UK: 25
EN: 72
RU: 48
AI status
Completed
Completed
100%
Causes
- Navigation control module powered off, unplugged, or failed
- Blown fuse or relay supplying the navigation unit
- Poor ground or low battery voltage to navigation unit
- Damaged or corroded connector at the navigation module
- Open, shorted, or high-resistance CAN/LIN wiring between modules
- Faulty or non‑responding module elsewhere on the same network preventing bus traffic
Symptoms
- ‘Lost Communication with Navigation Control Module’ or similar message on cluster or infotainment
- Navigation screen blank or unresponsive; map/audio/navigation functions inoperative
- Other modules reporting related network communication codes
- Intermittent operation of infotainment or navigation features
- Multiple related U0xxx network codes set concurrently
What to check
- Read all stored and pending codes from all modules with a capable scan tool; note freeze frame and occurrence frequency
- Verify battery voltage (engine off and cranking) and charging system health
- Inspect fuses and relays for the navigation unit and associated infotainment circuits
- Visually inspect navigation module connector(s) for corrosion, bent pins, or water intrusion
- Check for aftermarket equipment (alarms, amplifiers, head units) tied into data lines or power; disconnect if present
- Check for other modules reporting U0xxx or related codes that may indicate a bus-wide problem
Signal parameters
- Navigation module supply voltage: nominally ~11–14 V with key on (verify actual vehicle spec)
- Ground continuity: low-ohm connection to chassis ground
- High-speed CAN bus idle voltages: CAN High ≈ 2.5 V, CAN Low ≈ 2.5 V (individual voltages vary by vehicle)
- CAN differential during activity: several hundred millivolts to a few volts depending on traffic (verify with scope)
- Expected: valid CAN frames for navigation/infotainment channels present on the bus and module responds to diagnostic requests (scan tool)
Diagnostic algorithm
- Connect manufacturer-level scan tool and read all U0xxx and related codes from all control modules; record freeze-frame data
- Confirm vehicle battery health and voltage — recharge or connect a stable power source if low
- Verify relevant fuses/relays for navigation/infotainment circuits; replace if blown
- Locate the Navigation Control Module and visually inspect connector and wiring for damage, corrosion, or water intrusion; reseat connector
- With connectors connected, verify power and ground at the navigation module using a DVOM (11–14 V supply, good ground)
- Check CAN bus at the navigation module connector: measure CAN High/Low idle voltages, and if available use an oscilloscope to confirm proper differential signaling and presence of data frames
- If CAN lines show short to battery or ground, isolate and repair wiring harness between modules; perform wiggle test while monitoring bus
- Scan for and clear related network codes, then attempt to communicate directly with the navigation module using the scan tool. If the module cannot be reached but has correct power/ground and bus signals, suspect module failure
- If intermittent, disconnect aftermarket devices that could be loading the bus; retest
- If wiring and connectors are good and the module is unresponsive, consult OEM service information for software updates/reprogramming or module replacement and reprogramming procedures
- After repairs, clear codes and perform a function/road test to confirm the communication fault does not return
Likely causes
- Loose or corroded connector/power to navigation module
- Blown fuse or weak battery/poor ground
- Damaged CAN wiring (open, short to ground or battery) between navigation and other modules
- Failed Navigation Control Module
- Aftermarket device connected to the vehicle network causing bus errors
Fault status
Status
U0163 — Lost Communication With Navigation Control Module: navigation module not responding on vehicle data network.
Repair difficulty: Medium
Diagnostic time: 0.5 - 2.5 hours
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