My MM3 EGT reading is stuck on 3717.9 degrees.

Never changes with truck running or off.

Tried unplugging and plugging back in the OBD plug.

Tried unplugging the mini 4 pin connector from communications module and plugging back in.

Tried disconnecting the two sensor wires from the little EGT interface box and reconnected.

Looked at the wiring and didn’t see anything suspect.

Suspect faulty egt probe but wanted to see if there is anything else I’m missing before I buy another egt kit.

Any help would be greatly appreciated.


2016 3500 Laramie Mega DRW Aisin 3.73