Lost Communication With Tire Pressure Monitor Module
Your car's main computer lost contact with the tire pressure monitoring system, like a walkie-talkie that stopped receiving signals. The TPMS module isn't communicating properly over the vehicle's network bus.
The main ECU communicates with the TPMS module via the CAN bus network at regular intervals to receive tire pressure and temperature data from each wheel sensor. If the ECU fails to receive valid TPMS messages within the expected time window, it sets code U0127 to indicate a communication timeout.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| CAN Bus Message Timeout | TPMS data received every 100-500ms | No valid TPMS message received for >2 seconds |
| CAN Bus Signal Integrity | Valid checksums and message IDs present | Corrupted or missing TPMS module responses |
Code U0127 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, U0127 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.