Transmission won’t shift from 1st

[spweddabutter]

I have a 2009 m1097a2 that will only go in first gear and reverse. I jumped out the a e connection and no trans light. After opening up the control module box I found a black half moon part with green wires going to it that is cracked I am assuming this is the problem. What is this part called?

 

[Mogman]

WELCOME to the forum!!!
You have a PCS TCM, I am curious how they work, I have a PCS TCM on my 6L80 in the Detroit (M99
Not sure what that part is, hopefully someone will jump in here, BTW your trans is in 2nd gear, called limp mode.

 

[Mogman]

Here is the troubleshooting guide, I am not sure how having the PCS TCM affects the troubleshooting if at all.

 

[Mogman]

If you are not getting a transmission light in the run position but not running ether the TCM is not getting its 12V switched power (most likely) or the trans LED is bad.

 

[frauhansen]

i thonk your gearbox is not stuck in the 1th gear, i think it stucks in the 2td gear. I had the same.
No trans light and so on no option for blinking out the trans.

Watch directly behind your passanger seat. There is a switch/fuse you can press in again and it will feed your 12V gearbox ECU again.

 

[AAVP7]

The thing with the crack is an "EMI filter choke". If you look in the troubleshooting manual that was recommended above on page 138, the choke is in the schematic. Seems to be a filter between the 12 V relais and the "ignition feed" switched 12 V input to the TCM.

So in theory, if the crack also broke the few electronic components inside the filter, then the TCM wouldn´t get switched 12 V.

With the "ignition" switched on, check if you got 12 volts on wire 290C/291C. However, I would also check everything around the transmission circuit breaker behind the commander´s seat, and the 24/12V relais, that is adjacent to the circuit breaker.