Code
U0127
Generic
U — Network/User
Lost Communication With Tire Pressure Monitor Module
Views:
UK: 18
EN: 56
RU: 15
AI status
Completed
Completed
100%
Causes
- Blown fuse or disabled power/relay to the TPMS module
- Open, shorted, or damaged CAN bus wiring (CAN High/Low) between TPMS module and network
- Loose, corroded, or water-damaged connector at the TPMS module
- Failed TPMS module (internal electronics or antenna)
- Instrument cluster, BCM or other gateway module failing to route messages
- Aftermarket alarm/RF device or module interference on RF or CAN bus
Symptoms
- TPMS warning light or message illuminated on cluster
- No tire pressure or sensor ID data displayed on the instrument cluster or TPMS menu
- Inability to perform sensor relearn procedures or tool cannot communicate with TPMS module
- Other network modules show related communication errors or reduced functionality
- Intermittent TPMS messages or warnings that clear and return
What to check
- Use a scan tool to read stored and pending DTCs and attempt to communicate with the TPMS module
- Check for related U-codes (other lost-communication codes) to identify bus-wide issues
- Visually inspect fuses, relays and power/ground circuits for the TPMS module
- Inspect TPMS module connector(s) for corrosion, bent pins, water intrusion or loose terminals
- Verify vehicle CAN bus presence at TPMS module connector: measure CAN High and CAN Low idle voltages
- Wiggle harnesses and connectors while monitoring network traffic to reproduce intermittent faults
Signal parameters
- Vehicle CAN bus idle voltages (typical): CAN_H ≈ 2.5–3.5 V, CAN_L ≈ 1.5–2.5 V; dominant differential ≈ 1.5–3.0 V when active
- TPMS module should present on the network and transmit periodic tire status frames (frequency varies by system — often every 10–60 seconds while in motion)
- Diagnostic queries/responses between scan tool and TPMS module (module should respond to requests)
- Fuse/relay supply voltage to TPMS module: battery voltage (≈12 V) present with ignition on as specified by vehicle
Diagnostic algorithm
- Connect a capable scan tool and read all U- and TPMS-specific codes; note freeze-frame data and attempt to communicate with the TPMS module.
- Check for other lost-communication codes to determine if problem is isolated or network-wide.
- Inspect TPMS module fuse(s) and relay(s); verify power and ground at the module connector with ignition ON. Repair any open circuits.
- Visually inspect the TPMS module connector and wiring harness for corrosion, water damage, bent pins or chafing; repair as needed.
- With the module connected, measure CAN High and CAN Low voltages at the module connector relative to chassis ground. Compare to expected idle voltages. Look for shorts to battery or ground.
- Use the scan tool’s data list or a CAN bus monitor to check for TPMS module messages. If no messages, check continuity of CAN bus wiring between TPMS module and gateway/cluster (pin-to-pin).
- Disconnect or remove suspected aftermarket modules/devices that share CAN or RF paths and retest communication.
- If power, ground and CAN wiring are good but module is non-responsive, substitute a known-good TPMS module (or bench test according to OEM procedure). If replacement restores communication, program/configure per manufacturer instructions.
- After repair or module replacement, clear codes and perform TPMS sensor relearn if required. Road test to confirm normal operation and that codes do not return.
- If network issues persist, follow manufacturer-specific network/gateway diagnostics and consider instrument cluster or BCM as possible fault sources.
Likely causes
- Blown fuse or loss of power/ground to TPMS module
- Corroded or disconnected connector at the TPMS module
- Open or short in CAN wiring between TPMS module and BCM/cluster
- Failed TPMS module or failed gateway module
- Aftermarket device interfering with network or RF signals
Fault status
Status
Lost Communication With Tire Pressure Monitor Module — no CAN messages received from the TPMS module or module not responding to network requests.
Repair difficulty: Medium
Diagnostic time: 0.5-3.0 hours
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Code
U0127
HYUNDAI
U — Network/User
Lost Communication With Tire Pressure Monitor Module
Views:
UK: 12
EN: 35
RU: 12
AI status
Completed
Completed
100%
Causes
- Blown fuse or disabled power/relay to the TPMS module
- Open, shorted, or damaged CAN bus wiring (CAN High/Low) between TPMS module and network
- Loose, corroded, or water-damaged connector at the TPMS module
- Failed TPMS module (internal electronics or antenna)
- Instrument cluster, BCM or other gateway module failing to route messages
- Aftermarket alarm/RF device or module interference on RF or CAN bus
Symptoms
- TPMS warning light or message illuminated on cluster
- No tire pressure or sensor ID data displayed on the instrument cluster or TPMS menu
- Inability to perform sensor relearn procedures or tool cannot communicate with TPMS module
- Other network modules show related communication errors or reduced functionality
- Intermittent TPMS messages or warnings that clear and return
What to check
- Use a scan tool to read stored and pending DTCs and attempt to communicate with the TPMS module
- Check for related U-codes (other lost-communication codes) to identify bus-wide issues
- Visually inspect fuses, relays and power/ground circuits for the TPMS module
- Inspect TPMS module connector(s) for corrosion, bent pins, water intrusion or loose terminals
- Verify vehicle CAN bus presence at TPMS module connector: measure CAN High and CAN Low idle voltages
- Wiggle harnesses and connectors while monitoring network traffic to reproduce intermittent faults
Signal parameters
- Vehicle CAN bus idle voltages (typical): CAN_H ≈ 2.5–3.5 V, CAN_L ≈ 1.5–2.5 V; dominant differential ≈ 1.5–3.0 V when active
- TPMS module should present on the network and transmit periodic tire status frames (frequency varies by system — often every 10–60 seconds while in motion)
- Diagnostic queries/responses between scan tool and TPMS module (module should respond to requests)
- Fuse/relay supply voltage to TPMS module: battery voltage (≈12 V) present with ignition on as specified by vehicle
Diagnostic algorithm
- Connect a capable scan tool and read all U- and TPMS-specific codes; note freeze-frame data and attempt to communicate with the TPMS module.
- Check for other lost-communication codes to determine if problem is isolated or network-wide.
- Inspect TPMS module fuse(s) and relay(s); verify power and ground at the module connector with ignition ON. Repair any open circuits.
- Visually inspect the TPMS module connector and wiring harness for corrosion, water damage, bent pins or chafing; repair as needed.
- With the module connected, measure CAN High and CAN Low voltages at the module connector relative to chassis ground. Compare to expected idle voltages. Look for shorts to battery or ground.
- Use the scan tool’s data list or a CAN bus monitor to check for TPMS module messages. If no messages, check continuity of CAN bus wiring between TPMS module and gateway/cluster (pin-to-pin).
- Disconnect or remove suspected aftermarket modules/devices that share CAN or RF paths and retest communication.
- If power, ground and CAN wiring are good but module is non-responsive, substitute a known-good TPMS module (or bench test according to OEM procedure). If replacement restores communication, program/configure per manufacturer instructions.
- After repair or module replacement, clear codes and perform TPMS sensor relearn if required. Road test to confirm normal operation and that codes do not return.
- If network issues persist, follow manufacturer-specific network/gateway diagnostics and consider instrument cluster or BCM as possible fault sources.
Likely causes
- Blown fuse or loss of power/ground to TPMS module
- Corroded or disconnected connector at the TPMS module
- Open or short in CAN wiring between TPMS module and BCM/cluster
- Failed TPMS module or failed gateway module
- Aftermarket device interfering with network or RF signals
Fault status
Status
Lost Communication With Tire Pressure Monitor Module — no CAN messages received from the TPMS module or module not responding to network requests.
Repair difficulty: Medium
Diagnostic time: 0.5-3.0 hours
Similar codes
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Code
U0127
LAND ROVER
U — Network/User
Lost communication with the tire pressure monitor module
Views:
UK: 7
EN: 62
RU: 9
AI status
Completed
Completed
100%
Causes
- Blown fuse or disabled power/relay to the TPMS module
- Open, shorted, or damaged CAN bus wiring (CAN High/Low) between TPMS module and network
- Loose, corroded, or water-damaged connector at the TPMS module
- Failed TPMS module (internal electronics or antenna)
- Instrument cluster, BCM or other gateway module failing to route messages
- Aftermarket alarm/RF device or module interference on RF or CAN bus
Symptoms
- TPMS warning light or message illuminated on cluster
- No tire pressure or sensor ID data displayed on the instrument cluster or TPMS menu
- Inability to perform sensor relearn procedures or tool cannot communicate with TPMS module
- Other network modules show related communication errors or reduced functionality
- Intermittent TPMS messages or warnings that clear and return
What to check
- Use a scan tool to read stored and pending DTCs and attempt to communicate with the TPMS module
- Check for related U-codes (other lost-communication codes) to identify bus-wide issues
- Visually inspect fuses, relays and power/ground circuits for the TPMS module
- Inspect TPMS module connector(s) for corrosion, bent pins, water intrusion or loose terminals
- Verify vehicle CAN bus presence at TPMS module connector: measure CAN High and CAN Low idle voltages
- Wiggle harnesses and connectors while monitoring network traffic to reproduce intermittent faults
Signal parameters
- Vehicle CAN bus idle voltages (typical): CAN_H ≈ 2.5–3.5 V, CAN_L ≈ 1.5–2.5 V; dominant differential ≈ 1.5–3.0 V when active
- TPMS module should present on the network and transmit periodic tire status frames (frequency varies by system — often every 10–60 seconds while in motion)
- Diagnostic queries/responses between scan tool and TPMS module (module should respond to requests)
- Fuse/relay supply voltage to TPMS module: battery voltage (≈12 V) present with ignition on as specified by vehicle
Diagnostic algorithm
- Connect a capable scan tool and read all U- and TPMS-specific codes; note freeze-frame data and attempt to communicate with the TPMS module.
- Check for other lost-communication codes to determine if problem is isolated or network-wide.
- Inspect TPMS module fuse(s) and relay(s); verify power and ground at the module connector with ignition ON. Repair any open circuits.
- Visually inspect the TPMS module connector and wiring harness for corrosion, water damage, bent pins or chafing; repair as needed.
- With the module connected, measure CAN High and CAN Low voltages at the module connector relative to chassis ground. Compare to expected idle voltages. Look for shorts to battery or ground.
- Use the scan tool’s data list or a CAN bus monitor to check for TPMS module messages. If no messages, check continuity of CAN bus wiring between TPMS module and gateway/cluster (pin-to-pin).
- Disconnect or remove suspected aftermarket modules/devices that share CAN or RF paths and retest communication.
- If power, ground and CAN wiring are good but module is non-responsive, substitute a known-good TPMS module (or bench test according to OEM procedure). If replacement restores communication, program/configure per manufacturer instructions.
- After repair or module replacement, clear codes and perform TPMS sensor relearn if required. Road test to confirm normal operation and that codes do not return.
- If network issues persist, follow manufacturer-specific network/gateway diagnostics and consider instrument cluster or BCM as possible fault sources.
Likely causes
- Blown fuse or loss of power/ground to TPMS module
- Corroded or disconnected connector at the TPMS module
- Open or short in CAN wiring between TPMS module and BCM/cluster
- Failed TPMS module or failed gateway module
- Aftermarket device interfering with network or RF signals
Fault status
Status
Lost Communication With Tire Pressure Monitor Module — no CAN messages received from the TPMS module or module not responding to network requests.
Repair difficulty: Medium
Diagnostic time: 0.5-3.0 hours
Similar codes
Workshop Manuals
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
0
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Send to email