kenoverbey
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I have a '95 3500 gmc dually (89k miles)that the trans went into limp mode. After doing some checking and reading I came to the conclusion it was actually my ignition switch causing this. I could un hook the bat/reset and the trans would work fine. When I turned off the truck it would sometimes run for another second or so. This is when it would go into limp mode. When the truck cuts off immediately it does not go into limp mode. So, I have changed out the switch/harness a couple of times and the truck will still run on when switched off. This of course kicks it back into limp mode. The CEL does not come on so I haven't check for an actual code. Has anyone else heard of this or know what I should do? Thanks for the help