Buick Lucerne sudden stop and restart issue on Buick Lucerne

Some Buick Lucerne owners report experiencing sudden stop and restart issues, with engine shut-offs occurring without warning while driving. This unexpected shutdown can create a significant safety hazard due to the loss of power brakes and steering. Common causes identified include problems with the Ignition Control Module (ICM) ground wire, which may lead to stalls and shorts, as well as failures in the cam or crank sensor and poor connections in wiring or connectors. Additionally, some owners have noted that a faulty positive battery cable, which can lose connection when hot, may contribute to these stop and restart problems. It is recommended for owners facing these issues to have their vehicle inspected by a qualified mechanic to diagnose and resolve the underlying causes.