Code
U0161
Generic
U — Network/User
Lost Communication With Compass Module
Views:
UK: 22
EN: 51
RU: 34
AI status
Completed
Completed
100%
Causes
- Compass module power or ground open/low voltage
- Damaged or corroded connector(s) or wiring to the compass module
- Faulty compass module (internal electronics)
- Network bus fault (CAN/LIN short to ground/voltage, open bus, improper termination)
- Intermittent connection due to water intrusion or chafing
- Other module on the network pulling the bus low or flooding the network with errors
Symptoms
- Compass display blank, incorrect, or shows error message
- Instrument cluster or message center displays ‘Compass Fault’ or network communication warning
- Related systems tied to same module may show intermittent faults or erratic operation
- Diagnostic scanner shows U0161 and possibly other network communication U-codes
- Compass heading not updated or stuck on a single value
What to check
- Use a scan tool to read all stored and pending network codes and freeze frame data
- Check battery voltage (should be >12V while starting diagnosis) and main fuses for the compass/powertrain modules
- Visually inspect compass module connectors and wiring for damage, corrosion, or water ingress
- Check power and ground at the compass module connector (backprobe) with ignition ON
- Scan live data for presence/absence of compass messages and note message frequency if present
- Inspect the CAN/LIN bus for proper voltages and termination resistances (check for ~2.5 V idle on CAN)
Signal parameters
- Module supply voltage: ~12 V (check with key ON)
- Ground continuity: low ohms to chassis ground (
- CAN bus idle voltage: approximately 2.5 V between CAN_H and CAN_L mid-point
- Dominant/recessive CAN levels: CAN_H ~3.5 V / CAN_L ~1.5 V when dominant; varies by manufacturer
- Compass message frequency: typically low (e.g., ~1 Hz) — absence of expected periodic frames indicates a loss
- Network message IDs and exact timing are manufacturer-specific; verify with vehicle-specific data
Diagnostic algorithm
- Connect a capable scan tool and record U0161 plus any other U-codes; note freeze frame and occurrence conditions
- Clear codes, cycle ignition and see if U0161 returns to verify intermittent vs current fault
- Check vehicle battery voltage and relevant fuses/fusible links; repair any battery/fuse issues first
- Visually inspect and secure the compass module connector (often located in headliner, mirror or instrument area); look for corrosion, bent pins, water stains
- Backprobe compass module connector: verify power (12 V with key ON or as specified), ground continuity to chassis, and low-voltage reference if used
- Monitor network traffic on the bus with the scan tool or oscilloscope: verify presence of compass module frames or other modules causing errors; note bus voltage and any noise or dominant states
- If bus is silent or shorted, isolate sections (disconnect suspected modules or tap points) to find the short or hub of failure
- If wiring and bus appear good but no communication, attempt temporary replacement or swap with a known-good compass module (if available) or check for module programming/coding issues
- After repair, clear codes and perform road/test cycles to confirm the issue does not return; if persistent, consult vehicle-specific wiring diagrams and service bulletins
Likely causes
- Blown fuse or poor battery connection supplying compass module
- Loose/crushed/jumpered wiring near the headliner or mirror (common compass locations)
- Corroded/loose connector at the compass module assembly
- CAN bus short or missing termination resistor causing no valid frames
- Recent replacement or reflash of a related module without proper coding
Fault status
Status
Lost Communication With Compass Module — no valid messages received from the compass module over the vehicle network.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
U0161
HYUNDAI
U — Network/User
Lost Communication With Compass Module
Views:
UK: 17
EN: 34
RU: 28
AI status
Completed
Completed
100%
Causes
- Compass module power or ground open/low voltage
- Damaged or corroded connector(s) or wiring to the compass module
- Faulty compass module (internal electronics)
- Network bus fault (CAN/LIN short to ground/voltage, open bus, improper termination)
- Intermittent connection due to water intrusion or chafing
- Other module on the network pulling the bus low or flooding the network with errors
Symptoms
- Compass display blank, incorrect, or shows error message
- Instrument cluster or message center displays ‘Compass Fault’ or network communication warning
- Related systems tied to same module may show intermittent faults or erratic operation
- Diagnostic scanner shows U0161 and possibly other network communication U-codes
- Compass heading not updated or stuck on a single value
What to check
- Use a scan tool to read all stored and pending network codes and freeze frame data
- Check battery voltage (should be >12V while starting diagnosis) and main fuses for the compass/powertrain modules
- Visually inspect compass module connectors and wiring for damage, corrosion, or water ingress
- Check power and ground at the compass module connector (backprobe) with ignition ON
- Scan live data for presence/absence of compass messages and note message frequency if present
- Inspect the CAN/LIN bus for proper voltages and termination resistances (check for ~2.5 V idle on CAN)
Signal parameters
- Module supply voltage: ~12 V (check with key ON)
- Ground continuity: low ohms to chassis ground (
- CAN bus idle voltage: approximately 2.5 V between CAN_H and CAN_L mid-point
- Dominant/recessive CAN levels: CAN_H ~3.5 V / CAN_L ~1.5 V when dominant; varies by manufacturer
- Compass message frequency: typically low (e.g., ~1 Hz) — absence of expected periodic frames indicates a loss
- Network message IDs and exact timing are manufacturer-specific; verify with vehicle-specific data
Diagnostic algorithm
- Connect a capable scan tool and record U0161 plus any other U-codes; note freeze frame and occurrence conditions
- Clear codes, cycle ignition and see if U0161 returns to verify intermittent vs current fault
- Check vehicle battery voltage and relevant fuses/fusible links; repair any battery/fuse issues first
- Visually inspect and secure the compass module connector (often located in headliner, mirror or instrument area); look for corrosion, bent pins, water stains
- Backprobe compass module connector: verify power (12 V with key ON or as specified), ground continuity to chassis, and low-voltage reference if used
- Monitor network traffic on the bus with the scan tool or oscilloscope: verify presence of compass module frames or other modules causing errors; note bus voltage and any noise or dominant states
- If bus is silent or shorted, isolate sections (disconnect suspected modules or tap points) to find the short or hub of failure
- If wiring and bus appear good but no communication, attempt temporary replacement or swap with a known-good compass module (if available) or check for module programming/coding issues
- After repair, clear codes and perform road/test cycles to confirm the issue does not return; if persistent, consult vehicle-specific wiring diagrams and service bulletins
Likely causes
- Blown fuse or poor battery connection supplying compass module
- Loose/crushed/jumpered wiring near the headliner or mirror (common compass locations)
- Corroded/loose connector at the compass module assembly
- CAN bus short or missing termination resistor causing no valid frames
- Recent replacement or reflash of a related module without proper coding
Fault status
Status
Lost Communication With Compass Module — no valid messages received from the compass module over the vehicle network.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Your experience will help others
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Was this AI description helpful?
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Send to email