Code
U0191
Generic
U — Network/User
Lost Communication With Television
Views:
UK: 18
EN: 36
RU: 18
AI status
Completed
Completed
100%
Causes
- No power or ground to the television/display module (blown fuse, open feed, poor ground)
- Open or shorted wiring between the module and the communication bus
- Faulty or corroded connector at the television module
- Failed television/display module or damaged bus transceiver
- Bus wiring shorted to battery, ground or other circuit
- Missing/incorrect module programming or corrupted software
Symptoms
- Television/display does not power on or remains blank
- Infotainment features related to the TV module inoperative
- Multiple communication-related U-codes or network errors present
- Intermittent display operation or loss of functions when driving
- Other modules show communication timeouts or reduced functionality
What to check
- Use a scan tool to read freeze frame, event data and related U-codes; verify whether the television module is present on the network
- Check for other U-codes indicating broader bus failure (e.g., U0100, U0121)
- Visually inspect fuses and relays related to the TV/display power feed
- Inspect the television module connector for corrosion, bent pins or water intrusion
- Verify battery voltage at module power pin with ignition in proper state
- Verify good engine/vehicle ground at the module mounting/ground stud
Signal parameters
- Module supply: nominal vehicle battery ~11–14 V with ignition in RUN/ACC as required
- Ground:
- CAN bus idle voltages: CAN_H ~2.5–3.5 V, CAN_L ~1.5–2.5 V (recessive ~2.5 V each); dominant differential ~1–2 V
- Bus data rates commonly 125, 250 or 500 kbps (verify vehicle-specific rate with scan tool)
- LIN lines: single-wire low-speed serial; check for proper idle voltage per manufacturer (often pulled up to battery via resistor)
- MOST/optical networks: optical fiber continuity and correct light transmission (if used for TV/video)
Diagnostic algorithm
- Connect a capable scan tool and confirm U0191 is current or stored. Record freeze frame and related codes.
- Verify whether the TV/display module reports on the bus (module present list) or responds to basic diagnostic requests.
- Check fuses and power feed for the television module. Restore or replace any blown fuses and verify proper voltage at the module connector.
- Verify ground at the module. Clean and tighten ground connections if high resistance is found.
- Visually inspect the module and harness for damage, corrosion, water intrusion or disconnected connectors. Repair as needed.
- Using a multimeter, measure CAN/LIN/MOST/Ethernet wiring for continuity and shorts to power/ground. Repair any wiring faults.
- With ignition on, measure CAN_H and CAN_L idle voltages. If voltages are out of expected range, isolate and test segments to find the fault (measure at module and gateway)
- If bus appears held dominant or shorted, disconnect suspect module connectors one at a time (with ignition off as required) to identify which module causes the bus fault.
- If wiring and bus are good but module does not respond, try cycle ignition and perform a module wake/reboot procedure per manufacturer. Re-flash or update module software if an update is available and recommended.
- If module still fails to communicate after power/ground and bus verified good, consider replacing the television/display module. Verify programming/coding of replacement module per vehicle service procedures.
- After repairs, clear codes, perform network scan and verify normal operation and no reoccurrence of U0191.
Likely causes
- Blown fuse or loose power/ground at the television module
- Damaged or disconnected CAN/LIN/MOST/Ethernet harness to the TV module
- Failed bus transceiver on the television module
- Corroded or bent pins in the module connector
- Faulty module due to water intrusion or impact
- Incorrect module replacement or missing reflash after module swap
Fault status
Status
Lost Communication With Television — the vehicle communications network cannot reach the television/display module. Check power, ground, connectors, wiring and bus integrity; module may be unresponsive or failed.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Workshop Manuals
Available brands with manuals
2
AUDI 11
6-speed manual gearbox 0B1, front-wheel drive — Workshop Manual (Edition 05.2014)
Workshop Manual199,00 UAH
Audi A3 (1997) – 1.6L 4-cylinder (2‑valve) Engine Mechanical Components Service Manual (AEH, AKL, APF) – Edition 07.2002
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AUDI A3 (2004) Workshop Manual — 2.0L FSI Turbo (4‑cyl, 4‑valve) Engine, Mechanics — Edition 03.2017
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Audi A3 2004 — Electrical System (Workshop Manual, Edition 02.2018)
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Audi A4 / A4 Cabriolet – 4.2 l V8 (5‑valve, timing chains) – Workshop Manual (Mechanics) – Edition 04.2007
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Audi A4 / A4 Cabriolet — Auxiliary Heater Workshop Manual (Edition 08.2004)
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Audi A4 / A4 Cabriolet (1.8T 4‑cyl turbo) — Motronic Injection & Ignition System Service Manual (Edition 01.2015)
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Audi A8 (2003) — Electrical System Workshop Manual (Edition 08.2014)
Workshop Manual199,00 UAH
Audi Q4 e-tron (Type F4) - Self-study Programme SSP 685
Workshop Manual199,00 UAH
Audi Q8 (2018) — Electrical System Workshop Manual (Edition 05.2019)
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Audi Servicing Manual — 7‑Speed Dual Clutch Transmission 0CJ / 0CL / 0CK / 0DN / 0DP / 0HL (Edition 05.2018)
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LAND ROVER 3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
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Code
U0191
HYUNDAI
U — Network/User
Lost Communication With Television
Views:
UK: 16
EN: 22
RU: 13
AI status
Completed
Completed
100%
Causes
- No power or ground to the television/display module (blown fuse, open feed, poor ground)
- Open or shorted wiring between the module and the communication bus
- Faulty or corroded connector at the television module
- Failed television/display module or damaged bus transceiver
- Bus wiring shorted to battery, ground or other circuit
- Missing/incorrect module programming or corrupted software
Symptoms
- Television/display does not power on or remains blank
- Infotainment features related to the TV module inoperative
- Multiple communication-related U-codes or network errors present
- Intermittent display operation or loss of functions when driving
- Other modules show communication timeouts or reduced functionality
What to check
- Use a scan tool to read freeze frame, event data and related U-codes; verify whether the television module is present on the network
- Check for other U-codes indicating broader bus failure (e.g., U0100, U0121)
- Visually inspect fuses and relays related to the TV/display power feed
- Inspect the television module connector for corrosion, bent pins or water intrusion
- Verify battery voltage at module power pin with ignition in proper state
- Verify good engine/vehicle ground at the module mounting/ground stud
Signal parameters
- Module supply: nominal vehicle battery ~11–14 V with ignition in RUN/ACC as required
- Ground:
- CAN bus idle voltages: CAN_H ~2.5–3.5 V, CAN_L ~1.5–2.5 V (recessive ~2.5 V each); dominant differential ~1–2 V
- Bus data rates commonly 125, 250 or 500 kbps (verify vehicle-specific rate with scan tool)
- LIN lines: single-wire low-speed serial; check for proper idle voltage per manufacturer (often pulled up to battery via resistor)
- MOST/optical networks: optical fiber continuity and correct light transmission (if used for TV/video)
Diagnostic algorithm
- Connect a capable scan tool and confirm U0191 is current or stored. Record freeze frame and related codes.
- Verify whether the TV/display module reports on the bus (module present list) or responds to basic diagnostic requests.
- Check fuses and power feed for the television module. Restore or replace any blown fuses and verify proper voltage at the module connector.
- Verify ground at the module. Clean and tighten ground connections if high resistance is found.
- Visually inspect the module and harness for damage, corrosion, water intrusion or disconnected connectors. Repair as needed.
- Using a multimeter, measure CAN/LIN/MOST/Ethernet wiring for continuity and shorts to power/ground. Repair any wiring faults.
- With ignition on, measure CAN_H and CAN_L idle voltages. If voltages are out of expected range, isolate and test segments to find the fault (measure at module and gateway)
- If bus appears held dominant or shorted, disconnect suspect module connectors one at a time (with ignition off as required) to identify which module causes the bus fault.
- If wiring and bus are good but module does not respond, try cycle ignition and perform a module wake/reboot procedure per manufacturer. Re-flash or update module software if an update is available and recommended.
- If module still fails to communicate after power/ground and bus verified good, consider replacing the television/display module. Verify programming/coding of replacement module per vehicle service procedures.
- After repairs, clear codes, perform network scan and verify normal operation and no reoccurrence of U0191.
Likely causes
- Blown fuse or loose power/ground at the television module
- Damaged or disconnected CAN/LIN/MOST/Ethernet harness to the TV module
- Failed bus transceiver on the television module
- Corroded or bent pins in the module connector
- Faulty module due to water intrusion or impact
- Incorrect module replacement or missing reflash after module swap
Fault status
Status
Lost Communication With Television — the vehicle communications network cannot reach the television/display module. Check power, ground, connectors, wiring and bus integrity; module may be unresponsive or failed.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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Code
U0191
LAND ROVER
U — Network/User
Lost communication with the television
Views:
UK: 8
EN: 15
RU: 7
AI status
Completed
Completed
100%
Causes
- No power or ground to the television/display module (blown fuse, open feed, poor ground)
- Open or shorted wiring between the module and the communication bus
- Faulty or corroded connector at the television module
- Failed television/display module or damaged bus transceiver
- Bus wiring shorted to battery, ground or other circuit
- Missing/incorrect module programming or corrupted software
Symptoms
- Television/display does not power on or remains blank
- Infotainment features related to the TV module inoperative
- Multiple communication-related U-codes or network errors present
- Intermittent display operation or loss of functions when driving
- Other modules show communication timeouts or reduced functionality
What to check
- Use a scan tool to read freeze frame, event data and related U-codes; verify whether the television module is present on the network
- Check for other U-codes indicating broader bus failure (e.g., U0100, U0121)
- Visually inspect fuses and relays related to the TV/display power feed
- Inspect the television module connector for corrosion, bent pins or water intrusion
- Verify battery voltage at module power pin with ignition in proper state
- Verify good engine/vehicle ground at the module mounting/ground stud
Signal parameters
- Module supply: nominal vehicle battery ~11–14 V with ignition in RUN/ACC as required
- Ground:
- CAN bus idle voltages: CAN_H ~2.5–3.5 V, CAN_L ~1.5–2.5 V (recessive ~2.5 V each); dominant differential ~1–2 V
- Bus data rates commonly 125, 250 or 500 kbps (verify vehicle-specific rate with scan tool)
- LIN lines: single-wire low-speed serial; check for proper idle voltage per manufacturer (often pulled up to battery via resistor)
- MOST/optical networks: optical fiber continuity and correct light transmission (if used for TV/video)
Diagnostic algorithm
- Connect a capable scan tool and confirm U0191 is current or stored. Record freeze frame and related codes.
- Verify whether the TV/display module reports on the bus (module present list) or responds to basic diagnostic requests.
- Check fuses and power feed for the television module. Restore or replace any blown fuses and verify proper voltage at the module connector.
- Verify ground at the module. Clean and tighten ground connections if high resistance is found.
- Visually inspect the module and harness for damage, corrosion, water intrusion or disconnected connectors. Repair as needed.
- Using a multimeter, measure CAN/LIN/MOST/Ethernet wiring for continuity and shorts to power/ground. Repair any wiring faults.
- With ignition on, measure CAN_H and CAN_L idle voltages. If voltages are out of expected range, isolate and test segments to find the fault (measure at module and gateway)
- If bus appears held dominant or shorted, disconnect suspect module connectors one at a time (with ignition off as required) to identify which module causes the bus fault.
- If wiring and bus are good but module does not respond, try cycle ignition and perform a module wake/reboot procedure per manufacturer. Re-flash or update module software if an update is available and recommended.
- If module still fails to communicate after power/ground and bus verified good, consider replacing the television/display module. Verify programming/coding of replacement module per vehicle service procedures.
- After repairs, clear codes, perform network scan and verify normal operation and no reoccurrence of U0191.
Likely causes
- Blown fuse or loose power/ground at the television module
- Damaged or disconnected CAN/LIN/MOST/Ethernet harness to the TV module
- Failed bus transceiver on the television module
- Corroded or bent pins in the module connector
- Faulty module due to water intrusion or impact
- Incorrect module replacement or missing reflash after module swap
Fault status
Status
Lost Communication With Television — the vehicle communications network cannot reach the television/display module. Check power, ground, connectors, wiring and bus integrity; module may be unresponsive or failed.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
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👍 Like
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0
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