If a dealer is trained and certified to service a Volt can he also use the same diagnostic equipment for the Spark. One would think so since the spark is much simpler.
While you're correct that the batteries are different including the internal "heat exchanger", you'll find that the thermal components external to the battery are similar.There are some similarities, but also differences. I'd say the learning curve will be shorter for a Volt technician as a result. But the battery's are different, as are the cooling systems and the drive train.
My guess is that there is some special software involved to make the diagnostic equip to work w/ Spark (not to mention service person training).Well, Volt certification is NOT ELR certification. And Volt certified techs are not authorized to work on ELRs except in emergencies with GM assist. The Spark is differenter from the Volt than the ELR so...
Haven't heard an update in several months but back then dual Cadillac/Chevrolet dealerships with Volt techs had to get them ELR certified just like everyone else.