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I changed my fuel sending unit on my 2011 t660 kw and now I'm getting circuit failure seek service immediately on my dash. Any ideas? Truck ran fine and no dash circuit failure prior to swap.

Forgot to mention it comes on when I release my parking brake only

Can you see the active DTC?

I know this may be a longshot, but since cab control unit are flaky. I suggest disconnect power from batterie's for 30 min and see if it reset's.

I cleaned battery post and cables and problem went away. Disconnected for 15 min. Thanks bud

(01-10-2021 )jimeneztrans84 Wrote: [ -> ]I cleaned battery post and cables and problem went away. Disconnected for 15 min. Thanks bud

paccar cab controllers are known for ghost errors and flaky software. It is common to have to remove the battery terminals for 30 minutes to reset them sometimes.

Here are some related posts of the past on a search:

(from 2016):
http://rawze.com/forums/showthread.php?t...28#pid1628
http://rawze.com/forums/showthread.php?t...5#pid10025

(from 2017):
http://rawze.com/forums/showthread.php?t...6#pid21766

(from 2019):
http://rawze.com/forums/showthread.php?t...2#pid36772
http://rawze.com/forums/showthread.php?t...1#pid46331

(from 2020):
http://rawze.com/forums/showthread.php?t...0#pid59180