U0127

Code

LAND ROVER U — Network/User

Lost communication with the tire pressure monitor module

Brand: LAND ROVER

Type: U — Network/User

Views: UK: 18 EN: 201 RU: 22

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Page language: EN

Causes

Open or short in CAN bus wiring between TPMS module and gateway/ECU
Faulty TPMS module (internal failure)
Missing or blown fuse or poor power/ground to TPMS module
Corroded/loose connectors at TPMS module or wiring harness (including spare wheel area)
Multiple modules causing CAN bus fault or bus termination problem
Intermittent battery/low system voltage or recent battery disconnect or jump-start operation

Symptoms

TPMS warning lamp or dashboard message (TPMS fault)
No tire pressure data or sensor IDs shown in scan tool
Other CAN modules reporting communication faults or multiple U-codes
TPMS service light stays on after sensor replacement or relearn
Intermittent loss of TPMS information, especially after driving over bumps or through water

What to check

Use OEM or compatible diagnostic scanner to read U0127 and any accompanying codes and attempt to communicate with TPMS module
Check battery voltage (key on, engine off) and charge state; ensure >12V during tests
Inspect fuses and relays related to TPMS and body electronics
Visually inspect TPMS module connectors, wiring, and harness routing for damage, corrosion, pin push-out, or water intrusion (including spare/underbody locations)
Check ground integrity at module and chassis ground points (clean, secure, low resistance)
Measure CAN bus voltages at TPMS module connector with key ON: CAN H and CAN L idle and dominant levels, and check for bus termination resistors (~60 ohm between H and L)

Signal parameters

CAN bus idle voltages (typical): CAN H ≈ 2.5V, CAN L ≈ 2.5V (recessive)
CAN dominant voltages (typical): CAN H ≈ 3.5V, CAN L ≈ 1.5V during dominant bit — differential ~2V
Expected CAN baud rate: high-speed CAN network (manufacturer specific, often 500 kbps on many Land Rover networks) — verify with scan tool/schematic
TPMS RF sensor frequencies: typically 315 MHz or 433 MHz depending on market (sensors transmit battery, pressure, temperature and ID)
TPMS module should periodically broadcast status/messages on the CAN bus; absence of those messages indicates loss of comms

Diagnostic algorithm

Connect OEM-level diagnostic tool; record U0127 and any related codes and attempt to communicate with TPMS module. Note module response, VIN, and sensor IDs if available.
Check vehicle battery voltage and state; charge if low. Clear codes and attempt to reproduce; re-scan to confirm persistence.
Inspect TPMS module location and connectors for corrosion, water ingress, damaged wires, or pushed-out terminals. Repair or reseal as required.
Verify fuses and power/ground to the TPMS module. Measure +12V supply at the module with key ON and check ground for low resistance to chassis.
Measure CAN H and CAN L voltages at the TPMS module connector with key ON. Compare to typical idle/dominant values. If voltages are out of range, trace wiring for short to supply/ground or open.
Check for proper CAN termination (approx. 60 ohm between CAN H and CAN L). Remove suspected shorted modules one at a time if needed to isolate fault.
Use a CAN bus analyzer or scope with CAN decode to look for TPMS-specific frames or collisions. If no TPMS frames exist but bus healthy otherwise, suspect TPMS module failure.
Use a TPMS activation tool to trigger wheel sensors and confirm the TPMS module receives sensor data (if module responds, problem may be intermittent wiring or software).
If wiring, power and bus are verified good and module is not responding, replace TPMS module per manufacturer procedure and perform any required programming/relearn of sensors and module parameters.
After repair, clear codes, verify communication via scan tool, perform TPMS relearn/initialization and road test to confirm proper operation.

Likely causes

Damaged connector or wiring to TPMS module (common at tailgate/spare wheel areas on Land Rover)
Failed TPMS control module due to moisture ingress
Blown fuse or poor ground at TPMS module
CAN bus short to battery or chassis causing loss of messages

Fault status

⚠️ Status

U0127 — Lost communication with the Tire Pressure Monitor (TPMS) module. No CAN messages received from the TPMS module; verify CAN bus, power/ground, connectors and module.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-3.0 hours

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U0127 — Lost communication with the tire pressure monitor module