One problem related to software has been reported for the 2005 Buick Rainier. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Buick Rainier based on all problems reported for the 2005 Rainier.
The lower instrument panel display, that shows the odometer, fuel mileage etc, does not always come on. I have had the display show up prior to starting, while in "run" but not started and then not come on after starting. Most of the time it will come on the next time I start the vehicle after letting it sit for a minute or two. . Even more recently the fuel gauge did not go up to full after adding fuel, the needle bounced on full and then when I placed the vehicle into drive it went back to empty, then thirty seconds later it went back to full. Fortunately at that point the display was working and the range immediately went to zero, leaving me with no information on the fuel. The fuel gauge has also dropped to empty unexpectedly while driving. The problems are irritating and intermittent at this point, and chasing it down is next to impossible. I would also like to note that when the fuel gauge did its dance from e to f to e to f that the check engine light also came on. Unfortunately I am not able to get my obdii scanner to work on the car yet, to determine the problem, that may have to do with I have older software. The engine light is now off so I may never figure out what went wrong.