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Home / DTC / U0161 — Lost Communication With Compass Module

U0161 — Lost Communication With Compass Module

Detailed page for trouble code U0161.

33,912codes
59brands
11,451generic
22,461specific
All codes P-codes (Powertrain) B-codes (Body) C-codes (Chassis) U-codes (Network/User) Tesla Alerts
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Code

U0161

HYUNDAI U — Network/User

Lost Communication With Compass Module

Brand: HYUNDAI
Type: U — Network/User
Views: UK: 23 EN: 59 RU: 35
AI status
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Page language: EN

Causes

  • Damaged or loose connector at compass module or harness
  • Lost power or ground to compass module (blown fuse, open circuit)
  • CAN/LIN bus open, short to ground, short to battery or high resistance
  • Missing/bad termination resistor on data bus
  • Corrosion or water intrusion in wiring or connectors
  • Failed compass module or control module (BCM/IPC/navigation head unit)

Symptoms

  • Compass display disabled or shows ‘---’ / incorrect heading
  • Navigation system or compass-based features not updating
  • Instrument cluster or infotainment reports 'Compass Unavailable' or related message
  • One or more U0xxx communication codes present
  • Intermittent loss of other modules on same data bus

What to check

  • Scan vehicle for DTCs and note related U-codes and freeze frame data
  • Verify vehicle battery voltage is within spec
  • Inspect fuses and relays for the compass module and related modules
  • Visually inspect connectors and wiring to compass module and overhead console for damage, corrosion, or water
  • Attempt to communicate with compass module using OEM scanner/diagnostic tool
  • Check for other modules lost on the same network (indicates bus problem)

Signal parameters

  • CAN bus idle voltages: CAN_H ~2.5–3.5 V, CAN_L ~1.5–2.5 V (approximate ranges; refer to vehicle spec)
  • Differential CAN voltage during transmission: ~2.0 V peak-to-peak
  • Bus termination resistance: ~60 ohms across CAN_H and CAN_L
  • Message frequency: compass module message rate and expected message IDs (check OEM data)
  • Module supply voltage: typical 9–14 V when key on
  • Ground continuity: near 0 ohms to chassis ground

Diagnostic algorithm

  1. Read and record all DTCs and freeze frame data. Note if other U-codes are present.
  2. Attempt to communicate with the compass module using an OEM scan tool. If communication fails, proceed.
  3. Inspect fuses and power feeds for the compass module; verify supply voltage at the module connector with key ON.
  4. Check ground(s) for the module for continuity to chassis ground.
  5. Visually inspect the compass module connector and harness for corrosion, bent pins, or water intrusion; repair as needed.
  6. Measure CAN/LIN bus voltages at the module connector and elsewhere on the network. Verify terminations (~60 ohms for CAN).
  7. Probe the bus with a scope or logic analyzer to confirm message traffic and look for noise, shorts, or dominant states.
  8. If bus and power/ground OK but no module response, try swapping/bench-testing the compass module if available, or substitute a known-good module following OEM procedures.
  9. If module replaced, program/configure with correct software and VIN coding per manufacturer procedures.
  10. Clear codes, perform key cycles and road test to verify repair. Re-scan for any returning codes.

Likely causes

  • Corroded connector or pin at the compass module (overhead console)
  • Blown fuse or open power feed to the compass module
  • Local wiring chafe shorting CAN high/low to each other or to power/ground
  • Failed compass module hardware
  • Faulty termination or bus wiring causing no message traffic

Fault status

⚠️ Status
U0161 — Lost Communication With Compass Module. The vehicle's network controller cannot detect or receive expected data from the compass module over the vehicle data bus.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0100 U0140 U0155 U0164 U0166 U0073
370

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