Where is the fuse for ecm on a peterbilt 378?

The fuse for the ECM on a Peterbilt 378 is located in the main fuse box, which is situated on the passenger side of the vehicle, near the firewall. To access the main fuse box, you will need to remove the cover, which is held in place by a few screws. Once the cover is removed, you can locate the fuse for the ECM, which should be labeled as "ECM" or "Engine Control Module." The fuse is typically a 10-amp or 15-amp fuse.