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DTC codes / U01xx · Lost communication with a control module / U0172

U0172Lost Communication With 'Restraints System Sensor C'

U0172 is a generic network communication code indicating that a control module has lost the data signal from the restraints system sensor designated as 'C'. The computer has detected that the expected periodic message from that sensor is missing on the vehicle's communication bus, which can disable or degrade the airbag and seatbelt restraint functions.

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

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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