U0127: Lost Communication with Tire Pressure Monitor Module
Standardized SAE J2012 code · U01xx — Lost communication with modules
What does U0127 mean?
The Tire Pressure Monitor Module has stopped transmitting on the vehicle data bus, so other control units no longer receive its messages. Tire-pressure monitoring stops and warns the driver. Typical causes are loss of power or ground at the module, an open or shorted CAN/LIN bus wire, a connector fault, or an internal module failure.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Common causes
- High TPMS module unpowered
- Medium CAN wiring to TPMS broken
- Low Gateway module routing CAN messages incorrectly
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of U0127 on the same make and model first.
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