One problem related to ignition switch has been reported for the 2004 Buick Rainier. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Buick Rainier based on all problems reported for the 2004 Rainier.
The current investigation into faulty ignition switches is much broader than currently being investigated. . In 2004 I purchase the Buick ranier above. On initial test drive with salesman the vehicle shut off at 35 mph. After review by the mechanic it was attributed to a computer issue. I purchased the vehicle after retesting. During the next 4 years this happened at least 3 more times. Each time it was attributed to a computer upgrade. I have not had a problem since then in 2008. The symptoms and the results are consistent with all reported failures. I also have a friend with a Buick full size car 2006 I believe who had the same issue. The reports that this has not occurred on Buicks or SUV is not correct. This is a larger problem.