One problem related to ignition module has been reported for the 2003 Buick Regal. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Buick Regal based on all problems reported for the 2003 Regal.
Engine died while signalling a left turn going about 45 mph. Almost rear ended. Changed ignition switch module. No repeat reoccurance.