SPN 521

[Robert1966Garcia]

Update, I have been off for a few weeks due to COVID and low freight rates but have tried to figure the problem I am having and have learn the following.
1 the brake light switch is not the problem
2 the low air pressure sensor that the trans, brakes and traction control depends on is not it.
3 the issue, that I could find is not in the harness, connectors, tail lights Or tail light harness.
4 it only happens when the brake pedal is depressed and released, and happens if it is or is not in gear as well with the park brakes released or set.
5 you can set with your foot on the brakes till your leg gets tired and when you loose the slightest amount of air It will set the code.

I have the DLB program but don’t really know how to use it. Is there someone that I could talk too or pay them to remote in and give her a look???
I don’t want to be on the road with a check engine light on and or have a bigger problem away from home and my tools.
Thanks to each and everyone that even reads this post and the update, for your time!!