It could have a problem, or perhaps it just works during the day, or perhaps there's something wrong with the server. If you have the gauge cluster that gives you the ability to examine various settings on the car, you ought to have an option for MDS that lets you see when it is engaged tunnel rush

Is it possible to create an alert for the EGT temperature and have the Trinity cut the power output of the Puck to 1/3 of its present level when the alarm goes off?

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That is very normal; the best thing to do is to simply let it do what it's supposed to do and not interfere with it mapquest directions