devildogcummins
New member
- Joined
- Mar 30, 2008
- Messages
- 66
Problem truck is a 2007 5.9 auto with mods, I have been fighting the p2121 APPS code for at least a month now, replaced 2 APPS sensors, replaced gear indicater harness, and I am still getting a 1/2 volt spike very often which sets engine light and code p2121. Need a fresh mind to help what I need to look at, we havent rued out ECM but really doubt thats it. Any help would b awesome. Thanks guys