I have a 12v in a 98 freightliner. Truck has lost almost all power. No codes (don't know if it has codes). Today my 24v had similar problem with no boost, set code 0237 (map sensor). Does the 12v have same sensor? The 12v truck has no gauges so it is hard to see what is happening, but the turbo isn't spooling up like it did. Thanks.