new cars and trucks have this info center crap, my 03 gmc had this "reduced power" in the miles area of the cluster, and it also would not do more than idle when it happened, the cel light never came on, took it to the dealer as it was under warranty still, and it was a bad maf sensor. yet the cel never came on.

so id try resetting everything by taking off the battery and see what happens from there. the dic may need a reset and the scanner wont do it?