Code
U0160
Generic
U — Network/User
Lost Communication With Audible Alert Control Module
AI status
Completed
Completed
100%
Causes
- Failed Audible Alert Control Module
- Power or ground fault to the module (blown fuse, open circuit, corroded ground)
- Damaged or disconnected wiring/connector between module and network
- Faulty vehicle communication bus (CAN or LIN) — short, open, or high impedance
- Other module on network causing bus fault or excessive load
- Module in low-power/asleep state or not initialized after battery disconnect
Symptoms
- No audible chimes, alerts, or horn-related tones from associated functions
- Warnings or alerts shown on dash without sound
- Related functions that rely on the module do not operate
- Communication-related DTCs present in other modules
- Intermittent or permanent loss of module presence when scanning the network
What to check
- Connect a diagnostic scan tool and confirm U0160 and any related codes; check freeze frame and module presence
- Verify fuse(s) and relay(s) for the Audible Alert Module power feed
- Inspect module connector for corrosion, bent pins, or water ingress; tug-test harness for loose wires
- Check battery voltage and module supply/ground at the connector with key ON and engine OFF
- Scan for other U-codes that indicate bus problems (U0100, U0121, U0140, etc.)
- Measure CAN bus signals with a scope or multimeter at module connector and a known-good node
Signal parameters
- Module supply: ~12 V (vehicle nominal battery voltage) with key ON
- Module ground:
- CAN bus idle voltages (typical): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (differential ≈ 0 V)
- CAN dominant state (typical): CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ≈ 2 V)
- Typical CAN data rates: 125 kbps, 250 kbps, or 500 kbps depending on vehicle
- LIN bus idle: ~12 V with pull-up; active low pulses when addressed (if module uses LIN)
Diagnostic algorithm
- Record U0160 plus any other stored U/P codes and freeze frame data using a scan tool.
- Verify whether the Audible Alert Module is listed on the network summary or identified by the scan tool. Note module presence/absence.
- Check related fuses/relays for continuity and correct voltage. Replace blown fuses and retest.
- Visually inspect the module connector and wiring for damage, corrosion, or water intrusion; repair as needed.
- Backprobe module power and ground pins; verify battery voltage supply with key ON and good ground continuity.
- Check for CAN/LIN continuity between the module connector and a known-good module. Measure resistance across bus terminators (~60 ohms total for CAN).
- Use an oscilloscope to view CAN_H and CAN_L waveforms at the module connector while the vehicle is awake; look for valid differential signals and absence of noise or dominant/stuck states.
- If bus signals are absent or corrupted, disconnect suspect nodes (including aftermarket devices) one at a time to identify the fault source.
- If wiring and bus integrity are good but module does not respond, attempt an OBD session to reflash or reinitialize the module per manufacturer procedure.
- If communication cannot be restored and all wiring/power/ground/bus checks pass, consider replacing the Audible Alert Control Module and program/configure per service specifications.
- Clear codes and verify restoration of operation and no reoccurrence of U0160 after repair; road test if necessary.
Likely causes
- Blown fuse or bad power/ground at the Audible Alert Module
- Open/short in CAN/LIN wiring or poor connector pins at the module
- Module failed or internal hardware fault
- Bus communication fault caused by another module or aftermarket device
- Module asleep or not initialized after battery service
Fault status
Status
Lost Communication With Audible Alert Control Module — module not responding on vehicle network; verify power, ground, wiring, and bus integrity.
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
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Code
U0160
HYUNDAI
U — Network/User
Lost Communication With Audible Alert Control Module
AI status
Completed
Completed
100%
Causes
- Failed Audible Alert Control Module
- Power or ground fault to the module (blown fuse, open circuit, corroded ground)
- Damaged or disconnected wiring/connector between module and network
- Faulty vehicle communication bus (CAN or LIN) — short, open, or high impedance
- Other module on network causing bus fault or excessive load
- Module in low-power/asleep state or not initialized after battery disconnect
Symptoms
- No audible chimes, alerts, or horn-related tones from associated functions
- Warnings or alerts shown on dash without sound
- Related functions that rely on the module do not operate
- Communication-related DTCs present in other modules
- Intermittent or permanent loss of module presence when scanning the network
What to check
- Connect a diagnostic scan tool and confirm U0160 and any related codes; check freeze frame and module presence
- Verify fuse(s) and relay(s) for the Audible Alert Module power feed
- Inspect module connector for corrosion, bent pins, or water ingress; tug-test harness for loose wires
- Check battery voltage and module supply/ground at the connector with key ON and engine OFF
- Scan for other U-codes that indicate bus problems (U0100, U0121, U0140, etc.)
- Measure CAN bus signals with a scope or multimeter at module connector and a known-good node
Signal parameters
- Module supply: ~12 V (vehicle nominal battery voltage) with key ON
- Module ground:
- CAN bus idle voltages (typical): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (differential ≈ 0 V)
- CAN dominant state (typical): CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ≈ 2 V)
- Typical CAN data rates: 125 kbps, 250 kbps, or 500 kbps depending on vehicle
- LIN bus idle: ~12 V with pull-up; active low pulses when addressed (if module uses LIN)
Diagnostic algorithm
- Record U0160 plus any other stored U/P codes and freeze frame data using a scan tool.
- Verify whether the Audible Alert Module is listed on the network summary or identified by the scan tool. Note module presence/absence.
- Check related fuses/relays for continuity and correct voltage. Replace blown fuses and retest.
- Visually inspect the module connector and wiring for damage, corrosion, or water intrusion; repair as needed.
- Backprobe module power and ground pins; verify battery voltage supply with key ON and good ground continuity.
- Check for CAN/LIN continuity between the module connector and a known-good module. Measure resistance across bus terminators (~60 ohms total for CAN).
- Use an oscilloscope to view CAN_H and CAN_L waveforms at the module connector while the vehicle is awake; look for valid differential signals and absence of noise or dominant/stuck states.
- If bus signals are absent or corrupted, disconnect suspect nodes (including aftermarket devices) one at a time to identify the fault source.
- If wiring and bus integrity are good but module does not respond, attempt an OBD session to reflash or reinitialize the module per manufacturer procedure.
- If communication cannot be restored and all wiring/power/ground/bus checks pass, consider replacing the Audible Alert Control Module and program/configure per service specifications.
- Clear codes and verify restoration of operation and no reoccurrence of U0160 after repair; road test if necessary.
Likely causes
- Blown fuse or bad power/ground at the Audible Alert Module
- Open/short in CAN/LIN wiring or poor connector pins at the module
- Module failed or internal hardware fault
- Bus communication fault caused by another module or aftermarket device
- Module asleep or not initialized after battery service
Fault status
Status
Lost Communication With Audible Alert Control Module — module not responding on vehicle network; verify power, ground, wiring, and bus integrity.
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
Similar codes
Repair manuals
Manual library for HYUNDAI
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