Allison Transmission question
I have a 2001 Chevy 2500 LB7 Duramax. Last night I was driving home on a gravel road and hit a patch of water and mud. I drove through it and shortly after my truck got stuck in either third or fourth gear and a check engine light came up. I went to get the light checked and it said the code was for the transmission pressure switch. Anyone have any help or had this problem before?
Posted Oct 9, 2017, 4:02 PM UTC
11
all kinds of funky codes pop up and even limp mode when the NSBU switch gets water on it or inside it. on the drivers side of the trans where the cable hooks up, is your switch the black model or the new updated white one? here in canada where im from we constantly have issues with it, as 7 months out of the year during a left turn, the front wheel is spraying the switch with water and salt. I keep a spare one in my truck, it can cause problems from range issues, blank PRNDL display, No start, Limp mode at random times, random pressure miss-match codes, etc. The switch is in charge of telling the TCM what gear you have selected so it can set the internal valve bodies accordingly.