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DTC codes / U01xx · Lost communication with a control module / U0127

U0127Lost Communication With Tire Pressure Monitor Module

U0127 means the vehicle's main network lost communication with the tire pressure monitor (TPM) module, so the body control module or gateway no longer receives tire pressure data. The computer detected that the TPM module stopped responding to network messages, which typically disables the tire pressure warning system and may illuminate the TPMS light.

SystemNetwork
Code typeGeneric (all makes)
SeverityLow
Fix difficultyIntermediate
AreaLost communication with a control module

Symptoms you may notice

  • Tire pressure monitoring system (TPMS) warning light stays on or flashes
  • No individual tire pressure readings displayed on the dashboard
  • A message such as 'TPMS unavailable' or 'Service tire monitor' appears
  • Often no symptoms besides the warning light
  • Other unrelated warning lights may appear if the network fault is widespread
  • Remote keyless entry or other body functions may act up on some vehicles

Common causes, most likely first

  1. Failed tire pressure monitor module
  2. Blown fuse or poor power/ground connection to the TPM module
  3. Damaged or corroded wiring between the TPM module and the network
  4. Loose or damaged connector at the TPM module
  5. Network communication bus fault (CAN, LIN, or dedicated serial line)
  6. Low battery voltage or charging system issue affecting module operation
  7. Aftermarket accessories or improper installation interfering with the network

How to diagnose and fix it

  1. Verify battery voltage and charging system output; low voltage can cause communication codes
  2. Check the fuse and relay that supply power to the tire pressure monitor module
  3. Inspect the TPM module connector and wiring for corrosion, looseness, or damage
  4. Use a scan tool to confirm the code and check for other communication codes on the same network
  5. Perform a network integrity test or measure resistance on the communication bus to rule out wiring faults
  6. If wiring and power are good, replace the tire pressure monitor module and relearn tire sensors if required
  7. Clear codes and verify communication is restored with a test drive

Why the TPM module goes silent

  • A weak or failing battery is a common hidden cause; the TPM module may drop offline when cranking voltage dips too low.
  • Water intrusion into the TPM module or its connector, especially in vehicles with leaks or clogged sunroof drains, can corrode pins and kill communication.
  • Aftermarket electronics plugged into the data bus or improperly installed remote starters can disrupt network messages and set U0127.
  • The code does not always mean the TPM module is dead; a single chafed wire or loose ground can produce the same lost-communication fault.
  • Some vehicles require a module configuration or initialization procedure after replacement, and skipping it leaves the code active.

Can I keep driving with U0127?

The vehicle remains safe to drive because the fault only affects tire pressure monitoring, but you must check tire pressures manually with a gauge until repaired. Avoid ignoring the warning, as a slow leak could go unnoticed and lead to a blowout.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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