I keep getting the P0803 code "1-4 upshift solenoid circuit malfunction" or "control circuit M/T" whatever the M/T means, I don't know.....depending on where you look. I have the CAGS eliminator harness plugged in.....and it supposedly was supposed to work and prevent DTCs. Is that causing this code that is turning on my "Check Engine" light? I'll clear it out, then it will come back.....sometimes with an H (in the history I think??) and sometimes with a "C"? Not sure what the C means.....

Also I've seen a P1575 "Extended Travel Brake Switch Circuit High Voltage"....no clue what that means???? It also had an "H".

Just seeing if anyone has some insight for me. Thanks!

 

Kevin,

Did you try removing the CAGs bypass? Do that and see f the code pops up again. M/T probably means "Manual transmission". As far as the other code, try typing it in as a Google search to see if it shows up in a forum discussion. I'll bet it has.

Dave