Vehicle: 2012 Ford Escape, 4WD, V6-3.0L, Automatic Transmission
Problem: This vehicle came in to the shop because the engine ran rough and there was a strange smell coming from the exhaust. The transmission was also shifting harshly into each gear.
The tech connected a scan tool to view the parameter identification (PID) data and found the battery power from the ignition switch (VPWR) at 0v.
Next, the tech checked for VPWR from fuse #23 at the PCM connector C175B, pin #21 and found there was battery voltage at the connector. He unplugged the connector and checked the pins for being bent or corroded. They were in good condition. He also tested all the power and grounds at the PCM. They were all good as well.
Confirmed Repair: Since the power and grounds to the PCM were in good condition, the tech installed and programmed a new PCM. With the new PCM in place, the rough running and harsh shifting problem was fixed.