Front Air Bag Sensor Control problems of the 2014 GMC Acadia

While driving on the highway going 65 mph, engine light came on, then reduced engine power alert. The car went down to 8 mph and hard to steer. I was barely able to pull off on the side without getting hit. Turned off the car (45 mins) as I was waiting for my spouse and when I turned it back on, it started without an issue. The engine light has come on a few times and then it turns off on its own. The car has shut down a few times when driving slowly - turning from a stop or in drive-thru. Took it to the auto repair shop and mechanic was unable to replicate issue and find anything wrong with it. I also get the airbag sensor light turn on and off randomly.

"service air bag" light came on. Dealer made wiring repair to a sir module and replaced a sir system sensor for approximately $530. Immediately after picking the vehicle up from the dealer the "service air bag" came on again. The dealer was able to find a "bulletin" from GMC advising technicians to correct problem by soldering some electrical connections. This appears to have solved the problem. This seems to be a substantial design flaw and serious safety issue for a mission critical system where reliability is paramount. This part does not rotate, it is not subject to any unknown wear and tear, there are no preventative maintenance actions provided by the manufacturer. It also appears that GMC has not adequately advised their dealers and technicians that this deficiency exists and what the proper corrective actions is without exorbitant costs to the consumer.

Service airbag notification remains on due to unrepaired sensor. I paid the dealer once to make the repair and the service notification came back on a year later, but they want to charge me for the repair again. I have not been in a major accident so I'm not sure if the airbags will work. However, this has been a concern. I purchased the vehicle brand new from the dealer and this problem began within a few years. However, they refuse to help me without charging me hundreds of dollars.