Check Engine Light (Code P2646) - solved by replacing VTEC solenoid assembly

About 8 months ago my Element EX (with about 160k miles) suddenly lost power on the highway while traveling up a steep hill. The auto trans had just downshifted, RPMs climbed higher - I was cruising at around 65mph. It felt like a stall, but it did stumble a bit around 1k RMP and then regained power. I thought it was a fluke and...