Code U0151 on the 2020 Buick Encore indicates lost communication with the restraints control module (airbag/SRS module). This safety-critical module manages the vehicle's airbag system and seat belt pretensioners, making proper communication essential for occupant protection.
Restraints System Criticality
The restraints module constantly monitors crash sensors, seat belt buckle status, and occupant sensors. It must communicate this data to other modules and be ready to deploy airbags within milliseconds during a collision. Communication loss means the system cannot function properly to protect occupants.
Safety Warning
With U0151 present, the airbag warning light illuminates. The entire supplemental restraint system may be disabled. Airbags may not deploy in a collision, and seat belt pretensioners may not activate. This is a serious safety concern requiring immediate attention.
Diagnostic Approach
The restraints module is typically located under the center console or dashboard. Check the module connector for damage - recent floor flooding, console work, or front-end damage can affect this module. Verify power and ground supplies. Test CAN communication at the module. Any SRS work requires careful handling of airbag components.
Safety Precautions
Always disconnect the battery and wait the specified time (typically 1-2 minutes) before working on SRS components. Undeployed airbags can cause serious injury. If the module requires replacement, GM Tech 2 or equivalent is needed for programming and SRS system initialization.