Hi guys,

I'm in the process of troubleshooting a shifting problem with my project car and knowing the source of data for the GM.GEAR PID will greatly assist with the troubleshooting process.


Gen3 6.0 Volvo 240. Running cable throttle and flex sensor
4L80e, rebuilt by me
Whole car rewired by me
P59 PCM running 03150003 OS with 4L80e segment swap

I have mentioned 'by me' so people can safely assume I don't know what I'm doing and can also identify things I've likely screwed up.

The problem I'm having is with 2nd gear. It doesn't seem to exist for automatic upshift or automatic downshift, yet everything else in the transmission works nicely (including manual 2nd). I'm logging GM.GEAR and can see in the logs it shows 2, but it doesn't 'feel' like its getting 2.

If I can confirm where this information is source (e.g. requested gear from PCM, OR feedback from transmission pillow switches to indicate shift selection), I can potentially rule out a bunch of areas I've played with (or not).