transmission issues after thermostat change.
Senior Member
Joined: Jul 2012
Posts: 9,003
From: C-Town
Ignition Switch harness is open or shorted. Ignition Switch circuit poor electrical connection. Check voltage at fuse #33.
Thread Starter
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Junior Member
Joined: Apr 2021
Posts: 13
Well I found the pink wire from the tcm to the fuse box where it goes over the front of the engine was burnt and only had like 1 strand left hanging on. I cut out the bad part soldered in a new piece. Connected everything back up. Now the dash won’t do anything and key is stuck in ign. I’m gonna keep checking around for more burnt wires. Does a new tcm need to be reprogrammed?
Super Moderator
Joined: Jul 2007
Posts: 13,093
From: Boat Town USA MI
If brand new, they should need to be programmed for your vehicle as they are shared with other models. If you find a used one from a 2009-2010 H3 it may work without programming because it should already have the OEM schedules on it. Not sure if a 2008 TCM would work, but it might also.
Senior Member
Joined: Jul 2012
Posts: 9,003
From: C-Town
Well I found the pink wire from the tcm to the fuse box where it goes over the front of the engine was burnt and only had like 1 strand left hanging on. I cut out the bad part soldered in a new piece. Connected everything back up. Now the dash won’t do anything and key is stuck in ign. I’m gonna keep checking around for more burnt wires. Does a new tcm need to be reprogrammed?
Thread Starter
|
Junior Member
Joined: Apr 2021
Posts: 13
I was hoping I could get help from this site. the fuse box wasn't the problem at all. this trash harness gm uses is the problem. so if a wire is breaking it will heat up and cause problems in electrical modules. I was wasting my time with the fusebox and those connectors. the reason I asked was if the tcm is bad it will cause the gauges to not work and lock up the shifter. am i wrong?
Senior Member
Joined: Jul 2012
Posts: 9,003
From: C-Town
Hilarious. I was hoping I could get help from this site. the fuse box wasn't the problem at all. this trash harness gm uses is the problem. so if a wire is breaking it will heat up and cause problems in electrical modules. I was wasting my time with the fusebox and those connectors. the reason I asked was if the tcm is bad it will cause the gauges to not work and lock up the shifter. am i wrong?
I was hoping I could get help from this site. the fuse box wasn't the problem at all. this trash harness gm uses is the problem. so if a wire is breaking it will heat up and cause problems in electrical modules. I was wasting my time with the fusebox and those connectors. the reason I asked was if the tcm is bad it will cause the gauges to not work and lock up the shifter. am i wrong? You posted "..all started with thermostat replacement"...I can't see anything from here? I posted your codes are coming from ignition switch failure. Take it from there, get help, or send it to me! 
Thread Starter
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Junior Member
Joined: Apr 2021
Posts: 13
***FIXED***
so I found two wires in the harness that go across the engine that had come apart in the insulation. And one that had rubbed through exposing the wire. I pulled all the loom and tape to check each wire. So far everything is taped and loomed back up with no issues. It was the pink 12v and a white that went to the tcm. No idea what the other pink went to that had been rubbed through.
so I found two wires in the harness that go across the engine that had come apart in the insulation. And one that had rubbed through exposing the wire. I pulled all the loom and tape to check each wire. So far everything is taped and loomed back up with no issues. It was the pink 12v and a white that went to the tcm. No idea what the other pink went to that had been rubbed through.
Senior Member
Joined: Jul 2012
Posts: 9,003
From: C-Town
***FIXED***
so I found two wires in the harness that go across the engine that had come apart in the insulation. And one that had rubbed through exposing the wire. I pulled all the loom and tape to check each wire. So far everything is taped and loomed back up with no issues. It was the pink 12v and a white that went to the tcm. No idea what the other pink went to that had been rubbed through.
so I found two wires in the harness that go across the engine that had come apart in the insulation. And one that had rubbed through exposing the wire. I pulled all the loom and tape to check each wire. So far everything is taped and loomed back up with no issues. It was the pink 12v and a white that went to the tcm. No idea what the other pink went to that had been rubbed through.