My 05 Acura TSX went into limp mode outta nowhere a few mts ago. The DTC it throws is U0107…lost communication with TAC module. I found a flow chart in the service manual for diagnosing this code which mainly had me test the wiring for continuity and voltages…all which showed as normal. I got to a spot where it said to swap out the TAC module with a known good one, erase codes then retest for DTCs…well I replaced the module but it’s still got the DTC. I even went back thru the flow chart and redid all the steps…even the ones in between (for example it’d say something like test pin 20 on PCM connector B and TAC relay prong 3 for continuity…if yes go to step 12 if no go to step 14…rather than going to 14 I just did did EVERY step) and everything shows as normal. There is also a place in the chart that says to swap in a known good PCM which I was also led to but of course I’ve been unable to do that. From everything I’ve learned it appears to me the only thing left that could be causing this is a bad PCM, but I’m new to all this so that’s why I wanted to ask if anyone knows anything else that could be causing this problem. It’s the only DTC btw but before this happened my car had started having an issue with what I think is called the shift lock solenoid…it refuses to go out of park unless I manually override it by putting the key in the hole near the gear selector and put it in neutral before cranking. The PCM controls this as well but of course it could be totally unrelated. I just thought it was mentioning. I’ve charged the battery up to 13v several times so it’s got enough voltage.
I haven’t been able to remove the PCM to open it up and visually inspect the board bc one of the connectors is stuck and I haven’t been able to get it out which is so frustrating!! I’m almost wondering if the dealership super glued it in bc less than a mt b4 this started the car was taken in for a recall on corroded PCMs where they put a cheap thin piece of plastic on top of it(that wouldn’t help prevent corrosion) but I wouldn’t put it past those crooks to switch my PCM with one that was going out or do something to mess mine up thinking I’d be forced to come back and pay out the a$$ for repairs…esp if they super glued one of the harnesses! I hope I’m just being paranoid there but it makes no sense how all the rest of the harnesses came out fine and I’ve spent hours trying to pull that one out even sprayed wd40 and it won’t budge!
Anyway, any input is greatly appreciated!! Thx!