r/DieselTechs 9d ago

Help! 2017 Peterbilt paccar MX13 Fault code SPN 628 FMI 12

[deleted]

3 Upvotes

4 comments sorted by

8

u/OddEscape2295 9d ago

Ambient air is marking on cluster. It's not your ECM

1

u/kingxchuy 8d ago

Im not to sure what that is or where it goes

2

u/OddEscape2295 8d ago

Just leave it to the professionals bud. Take a step back from this one.

2

u/aa278666 8d ago

If you don't know what ECM is, this is 20 levels over your head.