Hello heymccall, Thanks again for the precise location. I will check that manifold and the wiring harness for the short-to-ground on wire A425-YL-18. Quick question: Do you think an active fault code 4206 on this sensor could be the root cause preventing proper calibration routines in Service Groups 70 and 71 (governor and PRV valve)? Could this active fault block the calibration process from completing successfully? Best regards, DOUAHCHIA